HoldsUp

Dr. Tyna Moore · 2026-04-30 · Tyna Moore (host), David Roberts, John Gilday

Stop the "Toxic" Estrogen Loop: The Secret to Safer HRT

52 research-tied claims examined: 6 contradicted 9 overstated 2 context 26 supported 9 unverified

6

Contradicted by research

0:17:55David Robertscontradictedmoderate

Mature broccoli is a goitrogen, whereas broccoli seeds and sprouts are not goitrogenic.

"the mature broccoli is a goitrogen. The the seeds and the sprouts are not." (said at 0:17:55)

The claim is partially accurate regarding sprouts, but contradicted regarding mature broccoli. Commercial mature broccoli (Brassica oleracea) contains less than 10 μmol of goitrin per 100 g serving, far below the threshold (194 μmol) required to inhibit thyroidal iodine uptake, and poses minimal risk to thyroid health. Meanwhile, human clinical trials confirm that broccoli sprout preparations do not adversely affect thyroid hormones (TSH, free T4) or thyroid autoimmunity.

0:32:27John Gildaycontradictedmoderate

In young people, exercise increases NRF2 expression, whereas in people over 60, over-exercising causes NRF2 levels to decline.

"Young people, you exercise, your NRF2 goes up like crazy. Um past 60 or so, NRF2 goes down if you over-exercise." (said at 0:32:27)

The speaker bundles two claims: that exercise robustly increases Nrf2 in young individuals, and that in adults over 60, over-exercising causes Nrf2 levels to decline. While acute exercise stimulates Nrf2 pathway activation and downstream antioxidant gene expression in young adults, evidence does not show that exercise causes Nrf2 levels to decline in older adults. Instead, randomized trials comparing adults aged 18–28 to adults aged 60 and older show that acute exercise still activates Nrf2 signaling in older adults, although the acute response is blunted or attenuated compared to younger individuals. Furthermore, sedentary older adults exhibit higher basal Nrf2 levels (reflecting baseline oxidative stress), and aerobic exercise training actually lowers basal Nrf2 while partially restoring its dynamic activation during exercise.

0:34:31David Robertscontradictedmoderate

Sulforaphane bypasses the creation of aldehydes in the liver during alcohol metabolism.

"in the liver the alcohol gets turned into an aldehyde. That aldehyde is super toxic and and it can lead to the hangover. And so sulforaphane bypasses that aldehyde creation." (said at 0:34:31)

The speaker claims that sulforaphane "bypasses that aldehyde creation" during alcohol metabolism in the liver. Published research demonstrates that sulforaphane does not bypass or prevent the formation of acetaldehyde (the primary aldehyde metabolite of ethanol). Instead, sulforaphane upregulates and activates aldehyde dehydrogenases (ALDH), the enzymes responsible for breaking down acetaldehyde into non-toxic acetate, thereby accelerating the elimination/metabolism of acetaldehyde rather than bypassing its creation (PMID: 23825090, PMID: 33388347).

0:48:20John Gildaycontradictedlow

Sulforaphane stimulates bile salt biosynthesis.

"And it also induces um bile salts. That's the master control over bile salt biosynthesis, which is uh another way you protect against SIBO is uh bile salt production." (said at 0:48:20)

Preclinical studies show that sulforaphane and Nrf2 activation suppress rather than stimulate bile acid biosynthesis. In rodent models, pharmacological and genetic activation of Nrf2 downregulates CYP7A1 (cholesterol 7alpha-hydroxylase, the rate-limiting enzyme in bile acid synthesis) and reduces hepatic and serum bile acid concentrations. Furthermore, the master transcriptional regulator of bile acid synthesis and homeostasis is the farnesoid X receptor (FXR), not sulforaphane or Nrf2.

1:15:35John Gildaycontradictedmoderate

Black pepper used in curcumin formulations enhances bioavailability by aggravating and disrupting enterocytes, thereby increasing inflammation.

"HOST: They use black pepper and other things that just and they say, "Oh, we put black pepper in it so it'll absorb." That's just causing leaky gut. The black pepper is just aggravating the enterocytes, like you said. GUEST2: Yeah, and instead of decreasing your inflammation, it's increasing your inflammation." (said at 1:15:35)

The claim that black pepper (piperine) enhances curcumin bioavailability by aggravating or damaging enterocytes (causing 'leaky gut') and thereby increasing inflammation is contradicted by both pharmacokinetic and clinical trial evidence. Pharmacokinetic studies demonstrate that piperine enhances curcumin bioavailability primarily through the reversible inhibition of hepatic and intestinal glucuronidation and modulation of drug efflux transporters, without causing gut barrier disruption. Furthermore, a systematic review of randomized controlled trials examining curcumin combined with piperine found significant reductions in systemic inflammatory markers (such as CRP, hs-CRP, and IL-6) and oxidative stress across diverse clinical populations, rather than an increase in inflammation.

1:20:23John Gildaycontradictedmoderate

Resveratrol acts as a selective agonist for estrogen receptor beta (ERβ).

"resveratrol is an estrogen receptor beta uh agonist uh selective agonist so that you know for the people that are worried about the alpha ER alpha issue, um a large number of the side effects from menopause are are because of the loss of estrogen receptor beta activation." (said at 1:20:23)

Pharmacological studies demonstrate that resveratrol is not a selective estrogen receptor beta (ERβ) agonist. In vitro receptor binding assays show that resveratrol binds both estrogen receptor alpha (ERα) and ERβ with comparable affinity (approximately 7,000-fold lower affinity than 17β-estradiol), unlike certain other phytoestrogens (such as genistein or S-equol) that exhibit preferential selectivity for ERβ. Resveratrol functions as a selective estrogen receptor modulator (SERM) with mixed agonist and antagonist properties across both ERα and ERβ depending on cell type, tissue context, and response elements, rather than acting as a subtype-selective ERβ agonist.

9

Overstated

0:04:15John Gildayoverstatedmoderate

Up to menopause women are protected against cardiometabolic conditions and fatty liver, but after menopause disease rates accelerate and catch up to men around age 60.

"as um up to menopause a woman is protected against all kinds of disease states, you know, including all cardiometabolic states, fatty liver, just the list goes on and on. And then as you go through menopause, a woman actually catches back up to a man, and so the rate actually accelerates faster than a man as as you lose estrogen and catches back up, you know, close to around 60." (said at 0:04:15)

The speaker accurately describes the sex-specific trajectory of cardiometabolic risk and nonalcoholic fatty liver disease (NAFLD): premenopausal women exhibit relative protection compared to men due to estrogen-mediated effects on fat partitioning and vascular health, followed by accelerated accumulation of visceral adiposity and metabolic risk post-menopause that narrows the gap with men around age 60. However, claiming that premenopausal women are protected against 'all kinds of disease states' and 'all cardiometabolic states' overstates the level of protection, as premenopausal women can and do develop cardiometabolic disorders and liver disease.

0:09:16David Robertsoverstatedlow

Sulforaphane activates the NRF2 pathway, turning on phase II detoxification and promoting the expression of 200 antioxidant genes for up to 72 hours.

"sulforaphane is the best natural molecule at turning on the NRF2 pathway. And that's important because that's responsible for phase two detoxification. ... turns on 200 different genes that express and promote 200 different antioxidants. And they it stays on for 72 hours." (said at 0:09:16)

Sulforaphane (SFN) is well established in preclinical and biochemical studies as a potent activator of the Keap1/Nrf2/ARE signaling pathway, which upregulates downstream cytoprotective, phase II detoxification enzymes and endogenous antioxidant proteins. However, the speaker overstates and simplifies these findings in several ways. While the Nrf2 transcriptional network controls hundreds of cytoprotective genes (estimates often range around 200+ genes in transcriptomic profiling), these encode various phase II enzymes, glutathione-synthesis proteins, and transporters, rather than directly expressing '200 different antioxidants' that remain continuously active for a fixed 72-hour period in vivo across tissues. Furthermore, calling it the single 'best natural molecule' is an absolute ranking unsupported by clinical consensus, and randomized clinical trials in humans (such as in atopic asthmatics consuming broccoli sprouts) have demonstrated that oral intake does not consistently induce cytoprotective antioxidant gene expression in target tissues or reduce markers of oxidative stress.

0:27:50Tyna Moore (host)overstatedlow

Patients taking standard starting and high doses of GLP-1 receptor agonists experience a 45% to 50% increase in SIBO (Small Intestinal Bacterial Overgrowth).

"There's like a 45 to 50% increase in SIBO in patients who are taking standard doses." (said at 0:27:50)

A large retrospective multicenter cohort study (TriNetX database, 216,173 propensity score-matched pairs) found that GLP-1 receptor agonist and dual GLP-1/GIP receptor agonist therapy was associated with an increased hazard of short-term diagnostically confirmed small intestinal bacterial overgrowth (SIBO) compared to other second-line type 2 diabetes medications (HR 2.14, 95% CI 1.13–4.07). However, the absolute incidence of SIBO in this population was extremely low (0.177 per 1,000 patient-years vs. 0.083 per 1,000 patient-years). No published evidence shows a 45% to 50% increase in SIBO; this figure likely conflates overall gastrointestinal adverse event rates commonly reported with GLP-1 agonists (such as nausea, diarrhea, and constipation affecting 40%–50% of clinical trial participants) with SIBO risk.

0:37:20John Gildayoverstatedmoderate

Direct antioxidants like vitamin A, vitamin C, and vitamin E have been shown to block the exercise stimulus that leads to strength gains.

"So, all the all the ones that have been shown to block exercise um uh were that you know, the stimulus that makes you get stronger are like vitamin E, vitamin A, vitamin C, you know, the direct antioxidants." (said at 0:37:20)

While high-dose antioxidant supplementation (particularly vitamins C and E) has been shown in some studies to dampen acute redox-sensitive intracellular signaling pathways and selectively attenuate certain muscular hypertrophy metrics, meta-analyses and randomized controlled trials show that they do not consistently block or attenuate gains in muscle strength. A 2020 systematic review and meta-analysis of randomized controlled trials (PMID 31851538) found no significant negative effect of vitamin C and/or E supplementation on muscle strength or lean mass gains following resistance training. In individual trials, such as Bjørnsen et al. (PMID 26129928), maximal strength (1RM) improved significantly and similarly in both antioxidant and placebo groups despite minor differences in lean mass gains. Furthermore, evidence specifically demonstrating that vitamin A blocks strength adaptations is lacking.

0:47:48John Gildayoverstatedlow

Sulforaphane exerts protective antimicrobial effects against Helicobacter pylori and small intestinal bacterial overgrowth (SIBO).

"it's actually protective for bacteria in your stomach like H H. pylori. It's protective of SIBO. Um if you get high doses released right into your um small intestines, it would be protective." (said at 0:47:48)

The speaker overstates the evidence by asserting that sulforaphane is protective against small intestinal bacterial overgrowth (SIBO) and that high doses released into the small intestine are protective, while claiming antimicrobial protection against Helicobacter pylori. For Helicobacter pylori, in vitro and preclinical studies show direct antibacterial activity, and clinical trials demonstrate that sulforaphane-rich broccoli sprout consumption reduces H. pylori colonization markers and attenuates gastric inflammation (PMID 19349290, PMID 39741515). However, human clinical trials show that sulforaphane does not reliably eradicate H. pylori when given alone (PMID 25287166) or improve eradication rates when added to standard clarithromycin-based triple therapy (PMID 31830776). For SIBO, there is no published clinical or preclinical evidence evaluating sulforaphane as a treatment or protective agent against SIBO. A systematic review of sulforaphane's antibacterial effects notes protection against aspirin-induced small intestinal damage in preclinical models, but does not identify evidence for SIBO (PMID 40553560). No published record matching sulforaphane for SIBO was located.

0:56:25John Gildayoverstatedvery low

Sulforaphane directly conjugates and inhibits STAT3 dimerization.

"I was going to start talking about STAT3. That's a new thing that that I found out it directly conjugates and and inhibits STAT3, which is in the center of inflammation in in tons of ways. And I was looking for, you know, a supplement to try and um work on, you know, the dimerization of STAT3. And it turns out sulforaphane is the best at that." (said at 0:56:25)

Preclinical cell culture studies show that sulforaphane can suppress STAT3 activation and phosphorylation (typically secondary to upstream kinases such as JAK2/Src, ROS modulation, or interactions with regulatory partners like PKM2). However, published literature does not demonstrate that sulforaphane directly conjugates to STAT3 to block its dimerization, nor is there comparative clinical evidence establishing sulforaphane as the 'best' supplement for targeting STAT3 dimerization. All existing evidence for sulforaphane's effects on STAT3 signaling is limited to preliminary in vitro and animal models.

0:47:48John Gildayoverstatedmoderate

The majority of the conversion of glucoraphanin to sulforaphane is performed by gut bacteria in the colon.

"the precursor, majority of the conversion happens by bacteria in your colon" (said at 0:47:48)

The claim that the majority of glucoraphanin conversion to sulforaphane occurs via gut bacteria in the colon is overstated. In fresh cruciferous vegetables, the plant enzyme myrosinase rapidly converts glucoraphanin to sulforaphane upon chewing and upper gastrointestinal digestion, providing approximately 3- to 10-fold higher bioavailability than microbial conversion. Mammalian host cells lack myrosinase-like activity, so when plant myrosinase is inactivated by cooking, blanching, or in isolated glucoraphanin supplements, conversion does rely on colonic microbiota; however, microbial conversion is relatively inefficient (bioavailability typically around 10–20%), meaning most ingested glucoraphanin remains unconverted or is metabolized into other compounds.

1:12:13David Robertsoverstatedlow

Sulforaphane activates the Nrf2 pathway in skin cells, helping to treat acne.

"if people with acne, it can be hard to to get rid of that and and so we have um you know, testimonials of people, you know, within several weeks um seeing a noticeable difference if not a complete, you know, reversal. And that's because of the NRF2 pathway and it's it gets to to each each skin cell." (said at 1:12:13)

Sulforaphane is known to activate the antioxidant and anti-inflammatory Keap1/Nrf2 signaling pathway in skin cells. However, claims that Nrf2 activation by sulforaphane leads to clinical reversal or treatment of active acne vulgaris rely primarily on mechanistic rationale and anecdotal reports; robust clinical trial evidence validating sulforaphane as an effective treatment for active acne in humans is currently lacking.

1:20:23John Gildayoverstatedlow

A large number of the side effects and symptoms of menopause are caused by the loss of estrogen receptor beta (ERβ) activation.

"a large number of the side effects from menopause are are because of the loss of estrogen receptor beta activation." (said at 1:20:23)

While estrogen receptor beta (ERβ) is actively researched as a target for selective therapies to alleviate menopausal symptoms (such as hot flashes and memory dysfunction) without the cancer risks driven by estrogen receptor alpha (ERα) activation, claiming that a "large number of the side effects from menopause are because of the loss of estrogen receptor beta activation" overstates the evidence. Both ERα and ERβ mediate estrogenic signaling, and animal models indicate that activation of either receptor (or predominantly ERα in classical pathways) can regulate thermoregulation and other physiological symptoms. Selective ERβ agonists (e.g., MF101/Menerba, EGX358) are being developed for therapeutic symptom relief, but menopausal symptoms stem broadly from systemic loss of circulating 17β-estradiol acting across both ERα and ERβ, as well as non-genomic estrogen pathways.

2

Needs context

0:22:36David Robertsneeds contextvery low

Sulforaphane slows down phase I detoxification and speeds up phase II detoxification.

"And so sulforaphane slows down phase one and then speeds up phase two so you don't get that detox flu" (said at 0:22:36)

Preclinical cell and animal studies support the premise that sulforaphane can inhibit certain Phase I cytochrome P450 enzymes (such as CYP3A4 and CYP2E1) and induce Phase II detoxification enzymes (such as glutathione S-transferases and NQO1 via the Nrf2 pathway). However, this effect is isozyme-specific rather than a universal suppression of all Phase I enzymes, and some models demonstrate induction of specific CYPs such as CYP1A1. Furthermore, there is no clinical evidence linking this enzymatic modulation to the prevention of 'detox flu', a colloquial naturopathic concept with no established medical definition.

1:14:05John Gildayneeds contextlow

Glucuronidated curcumin is completely biologically inactive.

"everybody's competing for the amount of um glucuronidated curcumin because it's completely inactive." (said at 1:14:05)

In direct cellular and molecular assays, glucuronidated curcumin is widely documented to lack the primary antiproliferative, anti-inflammatory, and signaling-inhibition activities seen with free (aglycone) curcumin. However, stating that it is 'completely inactive' requires context: while intrinsically inactive or markedly attenuated at target cellular receptors, curcumin glucuronide serves in vivo as a transport form or prodrug that can undergo deglucuronidation by tissue beta-glucuronidases (e.g., in bone marrow, inflamed sites, or tumor microenvironments) to regenerate active free curcumin.

26

Supported by research

0:00:00David Robertssupportedhigh

Chewing broccoli breaks plant cell walls to release the enzyme myrosinase, which converts glucoraphanin into sulforaphane.

"So, if you have a head of broccoli, start chewing it. The glucoraphanin, the precursor molecules in there, you break the cell wall through the chewing, and it releases an enzyme that converts that glucoraphanin into sulforaphane." (said at 0:00:00)

The biochemical mechanism is well-established. In intact broccoli, the glucosinolate precursor glucoraphanin and the enzyme myrosinase (a thioglucosidase) are segregated in separate cellular compartments. Mechanical disruption such as chewing or chopping breaks down plant cell walls and compartments, allowing myrosinase to interact with glucoraphanin and catalyze its hydrolysis into the bioactive isothiocyanate sulforaphane.

0:03:36John Gildaysupportedmoderate

The estrogen metabolite 4-hydroxyestrone can form DNA adducts and is genotoxic.

"one of those pathways, 4-hydroxyestrone, can be a DNA adduct. So it's it's genotoxic." (said at 0:03:36)

4-Hydroxyestrone is a catechol estrogen metabolite that undergoes metabolic oxidation to reactive catechol estrogen-3,4-quinones. These reactive electrophiles react directly with DNA bases (primarily purines like adenine and guanine) to form depurinating DNA adducts, leading to apurinic sites, mutations, and genotoxicity.

0:05:00John Gildaysupportedvery low

Loss of estrogen leads to loss of NRF2 induction, SIRT1 activation, and AMPK activation.

"And then as you lose this protective function, um you know, some of these other pathways that come into play are really important like NRF2. You lose NRF2 induction, um you lose SIRT1 activation, um uh AMPK as well." (said at 0:05:00)

Preclinical models of estrogen deficiency (such as ovariectomy) and translational human tissue studies demonstrate that the loss of estrogen signaling impairs the activation and downstream pathways of NRF2, SIRT1, and AMPK. Conversely, administration of estradiol or estrogen receptor agonists restores NRF2 nuclear translocation and antioxidant expression, upregulates SIRT1, and increases AMPK phosphorylation.

0:07:11John Gildaysupportedvery low

SIRT1 is a histone deacetylase that functions in genome gatekeeping and participates in repairing double-stranded DNA breaks.

"SIRT1 is is a genome gatekeeper. And so, if you're if you get double-stranded breaks in your in your um in your DNA, um SIRT1 is part of the complex that goes and repairs those that DNA. ... It's a histone deacetylase." (said at 0:07:11)

SIRT1 is well established as an NAD(+)-dependent class III histone deacetylase that plays a crucial role in maintaining genomic stability and facilitating the repair of DNA double-strand breaks (DSBs). In response to DNA damage, SIRT1 is recruited to DSB sites and promotes repair through pathways including homologous recombination (HR) and non-homologous end joining (NHEJ). Because evidence for this molecular mechanism comes from cell culture and animal experimental models, the certainty of evidence under standard clinical GRADE criteria is very low.

0:07:50John Gildaysupportedhigh

AMP kinase acts as a metabolic sensor measuring AMP to ATP ratios and triggers mitophagy and autophagy.

"And then AMP kinase is a metabolic sensor. So it it measures the amount of AMP to ATP. So when you're running out of energy, it turns on a bunch of pathways to to clean up shop, to start reusing some of the broken parts around your garage and start making a good car again. So that's this meta- mitophagy, autophagy." (said at 0:07:50)

The speaker's statement is supported. AMP-activated protein kinase (AMPK) is a well-established cellular energy sensor that is allosterically activated by rising AMP:ATP (and ADP:ATP) ratios during energy depletion. Upon activation, AMPK promotes cellular quality control by directly activating ULK1 and inhibiting mTORC1, thereby inducing both general macroautophagy and mitochondrial-specific autophagy (mitophagy) to recycle damaged components and restore energetic homeostasis.

0:24:44John Gildaysupportedvery low

NRF2 induction promotes the sealing of tight junctions in enterocytes, reducing endotoxin translocation and inflammation.

"if you study um tight junctions at all, um a central feature of that, and you can read it in any review, is that NRF2 induction causes tight junctions to seal. And so, as soon as you get the tight junctions in your enterocytes sealed, you've just established the stage one of of lowering inflammation." (said at 0:24:44)

Preclinical in vitro and animal models support the claim that Nrf2 activation promotes intestinal tight junction integrity (upregulating tight junction proteins such as ZO-1, occludin, and claudins) and attenuates mucosal inflammation and barrier permeability. Genetic silencing or knockdown of Nrf2 abolishes these protective effects on epithelial barrier integrity. However, this evidence is derived entirely from cellular and rodent experimental models, meaning clinical certainty in humans remains very low.

0:25:45David Robertssupportedvery low

In a mouse study, administering sulforaphane to aged mice reversed their microbiome composition to resemble that of young mice.

"it's a mice study where they um you know, had young young mice and old mice, and uh they measured the microbiome of each, and then they gave the old mice sulforaphane, and then and then measured their microbiome again, and it was it it and it was the same as the young mice. So, basically, their microbiome age um decreased so to so that they had the microbiome of young mice." (said at 0:25:45)

A 2020 study evaluated the effects of sulforaphane administration in young (6–8 weeks) and old (21–22 months) mice for two months. The authors found that dietary sulforaphane restored the gut microbiome profile in aged mice to mimic that of young mice, enriching bacterial taxa associated with improved intestinal barrier function and reduced inflammation. Because the evidence is derived solely from an animal model, certainty is very low regarding applicability to humans.

0:01:02Tyna Moore (host)supportedmoderate

Diindolylmethane (DIM) can inhibit or lower estrogen levels.

"everybody talks about DIM, and she's adamant that DIM can inhibit your estrogen, and this is not what we're going for necessarily when a woman's perimenopausal or menopausal and estrogen's leaving the building, and then she's taking DIM, which might be driving it down lower." (said at 0:01:02)

Clinical and pre-clinical studies demonstrate that diindolylmethane (DIM) exhibits antiestrogenic properties and can lower circulating estradiol levels and active estrogen signaling. In a prospective trial evaluating 1 year of daily DIM supplementation in female BRCA carriers (median age 47 years, 78% postmenopausal), mean serum estradiol significantly decreased from 159 pmol/L to 102 pmol/L. In randomized trials, DIM significantly enhanced the metabolic clearance of estrogen into less estrogenic pathways (increasing the urinary 2-hydroxyestrone to 16α-hydroxyestrone ratio) and increased sex hormone-binding globulin (SHBG) levels, which reduces biologically available estrogen.

0:31:47Tyna Moore (host)supportedmoderate

Sulforaphane induces the expression of heat shock proteins.

"And then I was reading that sulforaphane induces heat shock proteins. Do I have that right? GUEST2: Yep, it does." (said at 0:31:47)

Published experimental and clinical biomarker studies show that sulforaphane induces the heat shock response and upregulates the expression of several heat shock proteins (including Hsp27, Hsp70, and Hsp60). Mechanistic in vitro work demonstrates that sulforaphane activates heat shock transcription factor 1 (HSF1) to increase Hsp27 levels, while human trials and ex vivo assays using peripheral blood mononuclear cells have documented upregulation of HSP27 and HSP70 mRNA following sulforaphane treatment.

0:39:50Tyna Moore (host)supportedhigh

Estrogen loss induces interleukin-6 (IL-6), which promotes the development of osteoporosis.

"IL-6 is also what's driving osteoporosis GUEST2: Yes. Yes. the estrogen loses makes you induce IL-6." (said at 0:39:50)

The claim is supported by scientific evidence. Studies in animal models and human cellular biology demonstrate that estrogen deficiency upregulates pro-inflammatory cytokines, specifically interleukin-6 (IL-6), which promotes osteoclastogenesis (the formation and activation of bone-resorbing osteoclasts) and accelerates bone loss, contributing to postmenopausal osteoporosis.

0:42:25Tyna Moore (host)supportedhigh

Middle-aged women have the highest suicide rate among all female age groups.

"And then you read the studies and our age cohort is women in middle age is the highest has the highest suicide rate of women of any other age group." (said at 0:42:25)

Epidemiological surveillance data from the Centers for Disease Control and Prevention (CDC) and the National Vital Statistics System (NVSS) demonstrate that suicide rates among females in the United States peak during middle age (specifically ages 45–64), representing the highest suicide rate among all female age groups. This age-specific distribution differs notably from males, where suicide mortality rates are highest among elderly age cohorts.

0:42:50Tyna Moore (host)supportedvery low

Sulforaphane upregulates brain-derived neurotrophic factor (BDNF).

"And then I was in the research I was doing I realized that sulforaphane upregulates BDNF, too, which is awesome." (said at 0:42:50)

Preclinical laboratory research supports the claim that sulforaphane upregulates brain-derived neurotrophic factor (BDNF). In vitro neuronal cultures and rodent models demonstrate that sulforaphane stimulates BDNF transcription and expression through Nrf2 pathway activation and epigenetic mechanisms such as histone deacetylase (HDAC) inhibition. However, evidence is currently limited to cellular and animal models, and clinical trials confirming BDNF upregulation in humans remain lacking.

0:46:46David Robertssupportedhigh

Researchers at Johns Hopkins discovered sulforaphane in 1992.

"Johns Hopkins actually, I mean, they discovered sulforaphane in 1992, but they created the chemoprotective center, which uh up until 5 6 years ago was the broccoli sprout growing operation for the research." (said at 0:46:46)

In 1992, researchers at Johns Hopkins University School of Medicine (led by Paul Talalay and Yuesheng Zhang) isolated and identified sulforaphane from broccoli as a potent inducer of phase II chemoprotective and detoxication enzymes (published in the Proceedings of the National Academy of Sciences). While the chemical compound had been isolated from other plants and synthesized decades earlier, the landmark discovery of sulforaphane in broccoli and its role in cancer chemoprotection was made at Johns Hopkins in 1992.

0:58:02David Robertssupportedmoderate

Less than 1% of standard oral berberine and curcumin is absorbed across the intestinal barrier.

"John mentioned curcumin and berberine and those are um those are both lipid soluble. So like uh less than 1% of what you take gets through the gut barrier. Um it's like oil and vinegar basically. Um and so so ba- what we try to do and what we do is make um and you know, make it possible so that enough gets through the gut barrier um to like move the needle on the biology. And so if you take uh not you know, regular berberine, um it it you know, less than 1% gets through. Like I think it's .6 uh .7%" (said at 0:58:02)

Published pharmacokinetic evidence confirms that standard oral berberine and curcumin have very low oral bioavailability and intestinal absorption, typically below 1%. For berberine, animal and human pharmacokinetic studies report absolute oral bioavailability of less than 1% (frequently measured at approximately 0.68%), driven by poor intestinal membrane permeability, active P-glycoprotein efflux, low aqueous solubility, and extensive first-pass intestinal and hepatic metabolism.

0:45:00John Gildaysupportedvery low

Pure sulforaphane induces cell death and apoptosis in cell cultures at concentrations of approximately 10 micromolar.

"there's some papers out there showing sulforaphane has some um apoptosis induction, you know, at like 10 micromol, you know... if you order sulforaphane from Sigma where it's 100% sulforaphane, it does start showing cell death at 10 micromol." (said at 0:45:00)

In vitro studies evaluating sulforaphane in cell cultures demonstrate that concentrations around 10 to 30 μM induce cell cycle arrest, inhibition of cell proliferation, reactive oxygen species generation, and apoptotic cell death across various cell lines. Because this evidence is derived exclusively from in vitro cell culture models, certainty for broader biological/in vivo implications is rated very low.

1:01:00David Robertssupportedmoderate

Microwaving frozen dinners in plastic containers can leach millions of microplastics.

"frozen dinners that you microwave, those can leach, you know, the plastic containers, and they can leach millions of microplastics." (said at 1:01:00)

Laboratory testing of plastic food containers subjected to microwave heating demonstrates that millions of microplastics (and billions of nanoplastics) can leach into food simulants. A 2023 study published in Environmental Science & Technology found that 3 minutes of microwave heating of plastic containers released up to 4.22 million microplastic particles and 2.11 billion nanoplastic particles per square centimeter of plastic area, representing the highest release among tested usage scenarios.

1:01:21David Robertssupportedmoderate

Pyramid-shaped nylon tea bags can release up to 2 billion microplastics into a single cup of tea.

"those pyramid-shaped um shiny tea bags. But those are it's nylon. HOST: The worst. It's the worst. GUEST1: And so yeah, and I didn't do the study, but it showed to up to 2 billion microplastics just from one tea." (said at 1:01:21)

A landmark 2019 study by researchers at McGill University evaluated the release of plastic particles from commercial plastic (nylon and polyethylene terephthalate) teabags steeped in water at 95 °C. The researchers found that steeping a single plastic teabag released approximately 11.6 billion microplastics and 3.1 billion nanoplastics into a single cup, confirming that plastic teabags release billions of microplastic particles during normal brewing.

1:02:00David Robertssupportedhigh

Disposable paper cups are lined with plastic that releases microplastics when heated.

"those paper cups are lined with plastic. HOST: Yeah. GUEST1: And so it gets heated up. Um and so yeah, it's just you're getting three different places where you're getting microplastics" (said at 1:02:00)

Disposable paper cups are manufactured with an inner waterproof lining made of plastics (commonly polyethylene [PE] or polylactic acid [PLA]). Experimental analyses demonstrate that exposure to hot liquids causes this lining to degrade and release tens of thousands of microplastic particles and microfibers per liter into beverages.

1:03:53David Robertssupportedhigh

BPA acts as an estrogen mimic in the body.

"they can basically have these plasticizers like BPA which is um an estrogen mimic" (said at 1:03:53)

Extensive in vitro, animal, and mechanistic literature establishes that bisphenol A (BPA) acts as a xenoestrogen (estrogen mimic). BPA binds to classical nuclear estrogen receptors (ERα and ERβ) as well as membrane-bound estrogen receptors (such as GPER/GPR30), activating estrogen-dependent transcriptional and signaling pathways that regulate cellular proliferation, gene expression, and endocrine function.

1:04:20David Robertssupportedlow

BPA and estrogen mimics can cause earlier puberty onset in girls and irregular menstrual cycles in women.

"And then those uh BPAs, those estrogen mimics start getting released. And and so it's can be responsible for thing things like when a girl's going into puberty earlier. It can be responsible for women um having irregular menstrual cycles." (said at 1:04:20)

Epidemiological studies, systematic reviews, and toxicological research support the plausibility that bisphenol A (BPA) and related estrogenic endocrine-disrupting chemicals (EDCs) can contribute to earlier pubertal onset in girls and menstrual cycle irregularities in women. A 2026 systematic review and meta-analysis of observational studies found that higher postnatal BPA exposure was significantly associated with increased odds of early pubertal onset in girls (pooled OR = 4.45, 95% CI: 1.69–11.72), although substantial heterogeneity was present and causal direction cannot be firmly established from observational designs alone. Narrative reviews and cohort studies similarly associate BPA exposure with disruption of female reproductive hormone pathways, polycystic ovary syndrome (PCOS), and menstrual cycle alterations (such as heavy bleeding or cycle length irregularity). Certainty is graded low due to residual confounding, exposure measurement variability, and observational designs in human populations.

1:07:40John Gildaysupportedvery low

Sulforaphane activates the lysosomal receptor mucolipin 1 (TRPML1) through a redox-sensitive cysteine, releasing calcium and triggering lysosomal exocytosis via a synaptotagmin complex and LAMP-2.

"it's through a receptor called mucolipin 1. And so it has a redox sensitive cysteine that's just the same as what I was talking about earlier about on Keap1 and on IKKβ for NF-κB pathway. So this is in actually in the lysosome membrane and when you activate that you release calcium from the uh lysosome and it initiates a signaling cascade where um the same the same pathway where you get um neurotransmitters dumped in into uh the synaptic cleft in your brain. Um it's for neurotransmission. It's a synaptotagmin complex and LAMP-2. It fuses with the cell surface and actually um releases the lysosome right into the extracellular space." (said at 1:07:40)

Preclinical in vitro research demonstrates that sulforaphane (SFN) acts on the lysosomal cation channel mucolipin 1 (MCOLN1/TRPML1) through redox-sensitive mechanisms, promoting lysosomal calcium (Ca2+) release. This calcium signaling engages the machinery involved in lysosomal exocytosis and trafficking (including synaptotagmin complexes and lysosomal-associated membrane proteins) and triggers downstream pathways such as TFEB activation. Because this mechanism has only been demonstrated in cell culture and animal models, certainty is graded as very low.

1:09:30John Gildaysupportedhigh

TFEB is the master transcription factor that regulates lysosome biogenesis.

"there's a master transcription factor that regulates lysosome production. It's called TFEB" (said at 1:09:30)

Published cell biology research establishes transcription factor EB (TFEB) as the master transcription factor coordinating lysosomal biogenesis and autophagy. TFEB binds Coordinated Lysosomal Expression and Regulation (CLEAR) motifs in promoters across the lysosomal gene network, driving lysosomal biogenesis, acidification, and cellular clearance pathways.

1:09:40John Gildaysupportedvery low

Resveratrol induces genes regulated by TFEB to enhance lysosomal system capacity.

"resveratrol is very good at inducing this whole set of genes that are are made to make your lysosomal system a better conveyor belt." (said at 1:09:40)

Preclinical in vitro and animal studies support that resveratrol promotes the activation and nuclear translocation of transcription factor EB (TFEB)—a master transcriptional regulator of the autophagy-lysosome pathway (the CLEAR gene network)—thereby upregulating genes involved in lysosomal biogenesis, autophagosome formation, and lysosomal degradation capacity. However, evidence is currently limited to cellular and animal models, and clinical evidence in humans remains unestablished.

1:13:18David Robertssupportedmoderate

Resveratrol increases nitric oxide production to improve circulation.

"so does resveratrol. Um so you get nitric oxide so you get better circulation." (said at 1:13:18)

Preclinical and clinical evidence supports the claim that resveratrol stimulates nitric oxide production and improves endothelial-dependent circulation. Mechanistic studies demonstrate that resveratrol enhances endothelial nitric oxide synthase (eNOS) activity and nitric oxide (NO) bioavailability, mediating vasodilation and increased blood flow. Systematic reviews and meta-analyses of randomized controlled trials further confirm that resveratrol supplementation significantly improves flow-mediated dilation (FMD), a standard clinical measure of nitric oxide-dependent vascular function and circulation.

1:17:48John Gildaysupportedvery low

EGCG (epigallocatechin gallate) is an effective inhibitor of LPS-induced inflammatory stimulation.

"if people are interested in in blocking some of that is uh EGCG is one of the best inhibitors of that" (said at 1:17:48)

Published in vitro and animal studies consistently demonstrate that epigallocatechin-3-gallate (EGCG) suppresses lipopolysaccharide (LPS)-induced inflammatory activation. In cell culture (such as macrophages and dendritic cells) and rodent endotoxemia models, EGCG inhibits Toll-like receptor 4 (TLR4) signaling, attenuates NF-κB and MAPK pathway activation, and substantially reduces LPS-stimulated production of inflammatory mediators including TNF-α, IL-1β, IL-6, and inducible nitric oxide synthase. Because the available evidence relies primarily on preclinical mechanistic models, the certainty of evidence for clinical translation is very low.

1:19:50John Gildaysupportedvery low

Carnosic acid functions as a mild Nrf2 inducer, mild NF-κB inhibitor, and mild AMPK activator.

"carnosic acid is one of these molecules that I've been looking at for a long time because it can work synergistically with a lot of the ones that we already have now. So, it has very broad activity. It's a uh a mild NRF2 inducer, mild NF-κB inhibitor, and and mild AMPK kinase activator." (said at 1:19:50)

Preclinical studies (in vitro and animal models) support the characterization of carnosic acid—a major phenolic diterpene found in rosemary—as an agent that activates the Nrf2 antioxidant response pathway, inhibits NF-κB inflammatory signaling, and activates AMP-activated protein kinase (AMPK). Because available evidence is limited to cell culture and animal studies, overall certainty is very low.

9

No source found (not proven false)

0:14:20David Robertsunverifiedvery low

Phenethyl isothiocyanate (PEITC) from watercress acts synergistically with sulforaphane to stimulate NRF2 five times more than sulforaphane alone.

"And then we add one from watercress. It's called PEITC, phenethyl isothiocyanate. Name's not important, but what is important is that um and this is in the literature and we've shown it in our own tests, it stimulates NRF2 synergistically with sulforaphane. So, 1 + 1 = 5. So, it turns on NRF2 five times more than sulforaphane alone." (said at 0:14:20)

No published record matching the claim that phenethyl isothiocyanate (PEITC) acts synergistically with sulforaphane to stimulate NRF2 five times more than sulforaphane alone was located; this does not prove the claim false. While both sulforaphane and PEITC are well-documented in vitro and ex vivo activators of Nrf2 and downstream phase II antioxidant enzymes, published studies demonstrating a specific 5-fold synergistic co-activation of Nrf2 by this combination were not identified in the peer-reviewed literature.

0:28:54David Robertsunverifiedvery low

Glyphosate causes leaky gut by opening intestinal epithelial tight junctions.

"glyphosate's known to cause leaky gut opening the tight junctions. And so, he did this cell culture study opening with opening tight junctions with glyphosate, but then giving you know broccoli sulforaphane and showing that it's protective against that." (said at 0:28:54)

No published record matching the claim that glyphosate opens intestinal epithelial tight junctions to cause leaky gut and that broccoli-derived sulforaphane protects against glyphosate-induced tight junction disruption in cell culture was located; this does not prove the claim false.

0:28:54David Robertsunverifiedvery low

Sulforaphane protects intestinal epithelial tight junctions from damage caused by glyphosate.

"And so, he did this cell culture study opening with opening tight junctions with glyphosate, but then giving you know broccoli sulforaphane and showing that it's protective against that." (said at 0:28:54)

No published record matching a cell culture study showing that sulforaphane protects intestinal tight junctions specifically against glyphosate-induced disruption was located; this does not prove the claim false. While sulforaphane has been investigated in in vitro models for protecting intestinal epithelial integrity against various inflammatory and oxidative stressors (such as TNF-α), direct published evidence testing sulforaphane against glyphosate in tight-junction assays has not been identified in the peer-reviewed biomedical literature.

0:54:41John Gildayunverifiedvery low

Sulforaphane activates NRF2 and inhibits NF-κB via covalent modification of reactive cysteine residues.

"the way it affects NF-κB is the same way it activates um NRF2. It's through a reactive cysteine modification, the covalent change that happens." (said at 0:54:41)

No published record matching the claim that sulforaphane activates NRF2 and inhibits NF-κB through covalent modification of reactive cysteine residues was located; this does not prove the claim false.

0:39:41David Robertsunverifiedvery low

A 10 mg dose of sulforaphane reduces interleukin-6 (IL-6) levels by 30% within 24 hours.

"two capsules so 10 mg of sulforaphane um decreases IL-6 so uh so an inflammatory marker 30% in 24 hours." (said at 0:39:41)

No published record matching the claim that a 10 mg dose of sulforaphane decreases interleukin-6 (IL-6) levels by 30% within 24 hours was located; this does not prove the claim false. While sulforaphane has been investigated for its antioxidant and anti-inflammatory properties in preclinical models and small human trials, clinical data demonstrating this specific acute percentage reduction at a 10 mg dose in humans are lacking.

1:02:22David Robertsunverifiedvery low

People inhale more microplastics from breathing than they ingest from food and drink.

"you actually get more microplastics from breathing than what you do ingestion." (said at 1:02:22)

No published record matching the claim that people inhale more microplastics from breathing than they ingest from food and drink was located; this does not prove the claim false.

1:17:20John Gildayunverifiedvery low

Polysorbate 80 strips lipopolysaccharide (LPS) off the outer membrane of gram-negative bacteria such as Salmonella.

"if you take um uh one like salmonella and you want to get a really potent um immune reaction, you mix that with polysorbate 80 and it strips the strips the LPS off the surface and then you can use that as a stimulant" (said at 1:17:20)

No published record matching the claim that mixing Salmonella with polysorbate 80 strips lipopolysaccharide (LPS) from the bacterial surface to create a potent immune stimulant was located; this does not prove the claim false. While detergents and surfactants can interact with bacterial outer membranes, standard biochemical extraction of LPS typically uses methods such as hot phenol-water extraction or specific organic solvent protocols rather than simple mixing with polysorbate 80.

1:19:35John Gildayunverifiedvery low

Clinical studies show black cohosh acts on serotonin and dopamine pathways in the hypothalamus to aid in temperature regulation and mood.

"the black cohosh is uh clinical studies showing that it it um works on serotonin, dopamine in the hypothalamus. And so, those are sort of the the uh temperature regulation and mood um centers. So, it helps helps with that." (said at 1:19:35)

No published record matching the claim that clinical studies show black cohosh acts on serotonin and dopamine pathways in the hypothalamus to aid in temperature regulation and mood was located; this does not prove the claim false.

1:16:12John Gildayunverifiedvery low

Certain highly bioavailable commercial curcumin supplement formulations are composed of approximately 97% detergent (polysorbate 80) and only 3% curcumin.

"Yeah, and the one a lot of doctors say is the most bioavailable actually is 97% um detergent and 3% curcumin." (said at 1:16:12)

No published record matching the claim that certain highly bioavailable commercial curcumin supplement formulations contain approximately 97% polysorbate 80 detergent and 3% curcumin was located; this does not prove the claim false.

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.