HoldsUp

Chris Williamson · 2026-05-25 · Andrew Huberman, Chris Williamson (host), Tom Segura, Matt McCusker

Andrew Huberman, Matt McCusker & Tom Segura - Mostly Wise #1

64 claims checked against research: 5 contradicted 1 contradicted online 9 overstated 6 needing context 36 supported 1 corroborated online 6 unverified

36

Supported by research

0:01:35Andrew Hubermansupportedmoderate

The prostate receives relatively low blood flow compared to other tissues.

"the prostate's weird, too, cuz it doesn't get a lot of blood flow compared to other tissues." (said at 0:01:35)

Quantitative perfusion studies using arterial spin labeling (ASL) MRI and computed tomography demonstrate that resting blood flow in normal prostate tissue is relatively low (approximately 25 to 50 mL/100 g/min) compared to major vital and highly vascularized organs such as the kidneys (~400 mL/100 g/min), heart (~80–100 mL/100 g/min), liver, and brain (~50–60 mL/100 g/min). Microvascular blood flow velocity in prostate tissue is also considerably slower than in cerebral tissue, although baseline prostate blood flow remains higher than that of resting skeletal muscle or adipose tissue.

0:02:32Tom Segurasupportedhigh

Tadalafil causes vasodilation that slightly lowers blood pressure.

"And it can and it can disrupt, you know, lower blood pressure slightly and things like that cuz you you get in vasodilation, so you know, all the pipes are getting a little bigger." (said at 0:02:32)

Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor that promotes vascular smooth muscle relaxation and vasodilation via cyclic guanosine monophosphate (cGMP) accumulation. Extensive clinical trial data show that tadalafil exerts mild vasodilatory effects leading to slight, transient reductions in systolic and diastolic blood pressure in both healthy individuals and patients with cardiovascular conditions.

0:03:44Chris Williamson (host)supportedhigh

Sildenafil (Viagra) was originally tested in clinical trials for angina and cardiovascular conditions before its erectile effects were observed.

"they were trying to do something I think it was for angina. It was more heart stuff. And they found typically when medical trials finished and they asked people to give the medication back, people don't have any issue in doing it. And no one wanted to give the medication back." (said at 0:03:44)

The host's statement accurately reflects the development history of sildenafil (Viagra). Sildenafil was originally developed and evaluated in early clinical trials as a vasodilator for cardiovascular conditions, specifically angina pectoris and hypertension. During these trials, its secondary effect on penile erections was observed when trial participants reported improved erectile function, leading researchers to pivot its clinical development toward erectile dysfunction.

0:04:39Andrew Hubermansupportedhigh

Low-dose tadalafil causes facial flushing or redness.

"at this very low low dose, it will make you a little ruddy. Like a little you know, like it makes you a little bit red." (said at 0:04:39)

Clinical trial safety data and pharmacovigilance database analyses confirm that tadalafil acts as a vasodilator via PDE5 inhibition and commonly causes facial flushing (redness) as an adverse effect. Across clinical trials and regulatory database reviews, flushing is documented among the most frequent treatment-emergent vasodilatory adverse events associated with tadalafil use.

0:32:06Andrew Hubermansupportedhigh

Marc Andreessen co-founded the technology company Netscape.

"Yeah, so Marc Andreessen started Netscape." (said at 0:32:06)

Historical records and computing history literature confirm that Marc Andreessen co-founded Netscape Communications Corp. (originally Mosaic Communications Corporation) in 1994 alongside Jim Clark, developing the Netscape Navigator web browser.

0:33:38Andrew Hubermansupportedhigh

Suicide rates are significantly increasing.

"I think the point Dana was trying to make was that men's mental health, while critical, right? Suicide rates are way up. Like, we all acknowledge that." (said at 0:33:38)

National vital statistics and CDC surveillance data confirm that overall suicide rates in the United States increased substantially over the last two decades, rising from approximately 10.7-10.8 deaths per 100,000 in the early 2000s to over 14.1-14.6 per 100,000 in recent years. Men account for the large majority of these deaths, with firearm-related suicides in men being the single largest driver of the increase. Regionally, the WHO Americas region has seen an overall increase in suicide mortality from 2000 to 2019, whereas global suicide rates in most other WHO regions have experienced downward trends during the same timeframe.

0:45:40Chris Williamson (host)supportedhigh

Over 95% of Americans do not consume the recommended daily amount of dietary fiber.

"Well, it turns out that 95% of Americans don't get enough of it, which is why I'm such a huge fan of Momentous's Fiber Plus." (said at 0:45:40)

Nationally representative surveillance data from the National Health and Nutrition Examination Survey (NHANES) and position statements from the Academy of Nutrition and Dietetics confirm that only approximately 5% of Americans meet the Adequate Intake recommendations for dietary fiber (14 g per 1,000 kcal, or 25 g/day for adult women and 38 g/day for adult men), meaning roughly 95% do not consume the recommended amount.

0:53:30Matt McCuskersupportedmoderate

Slip and fall legal claims and injuries account for billions of dollars in settlements and payouts each year in the United States.

"If you fall, there's billions of dollars get paid out every year in America for like falling." (said at 0:53:30)

Published economic and epidemiological analyses confirm that fall-related injuries in the United States generate tens of billions of dollars annually in direct medical expenditures, insurance payouts, and related costs. An analysis of national databases and Medicare claims found that direct medical costs for nonfatal fall injuries in older adults alone reached approximately $19 billion in a single year, with billions paid out across hospitalizations, emergency care, and outpatient services.

1:03:48Matt McCuskersupportedlow

According to some forensic pathologists, the way and force with which a hyoid bone is broken is more consistent with homicide than suicide.

"The hyoid bone that snapped, if you talk to certain forensic pathologists, they say it's more consistent with a homicide than a suicide. The way the force with which it was broken, right?" (said at 1:03:48)

Forensic pathology literature and forensic guidelines support the statement that the nature and mechanism of a hyoid bone fracture are often viewed by pathologists as more suggestive of manual strangulation (predominantly homicidal) than of suicidal hanging. Autopsy studies distinguish hanging (typically suicidal) from manual or ligature strangulation (predominantly homicidal), noting distinct injury patterns: direct inward compressing forces in manual strangulation frequently produce hyoid fractures and extensive laryngohyoid damage, whereas hangings less frequently fracture the hyoid alone and show different soft tissue and ligature patterns. Forensic experts note, however, that hyoid fractures are not entirely pathognomonic and cannot be used in isolation to rule out suicidal hanging.

1:11:59Andrew Hubermansupportedhigh

The United States Secret Service was originally created in 1865 to suppress counterfeit currency rather than protect the president.

"Secret Service was started as an attempt, as a unit within the government against counterfeiting. That's how it started." (said at 1:11:59)

Historical records and scholarly literature confirm that the United States Secret Service was created in 1865 as a division under the Department of the Treasury specifically to combat widespread currency counterfeiting. The agency did not take on presidential protection duties until decades later, following the 1901 assassination of President William McKinley.

1:15:54Andrew Hubermansupportedmoderate

Owning or having a gun significantly increases the probability that someone gets shot.

"They increase the probability somebody gets shot significantly." (said at 1:15:54)

A large body of observational evidence and systematic reviews indicates that owning or having household access to a firearm significantly increases the risk of being shot, including by homicide, suicide, and unintentional injury. A systematic review and meta-analysis of observational studies found that firearm accessibility was associated with a twofold increase in the odds of homicide victimization (pooled OR 2.00, 95% CI 1.56 to 3.02) and a more than threefold increase in the odds of completed suicide (pooled OR 3.24, 95% CI 2.41 to 4.40). Furthermore, a large population-based cohort study of over 17.5 million adults found that living with a handgun owner was associated with a significantly elevated rate of firearm homicide victimization (adjusted hazard ratio 2.83, 95% CI 2.05 to 3.91), with a sevenfold higher risk of being fatally shot by an intimate partner in the home.

1:17:20Andrew Hubermansupportedmoderate

Cannabis consumption can trigger permanent psychosis or severe psychotic episodes in individuals predisposed to psychosis or bipolar disorder.

"cannabis thing is tricky because some people can do it and they're they're all right. Other people who have a predisposition to psychosis, like they can end up with some permanent psychosis. People who are predisposed to bipolar. I mean, it's it's a real thing." (said at 1:17:20)

Substantial epidemiological and meta-analytic evidence indicates that cannabis use is associated with acute psychotic episodes, earlier onset of psychotic disorders, and an increased risk of transition to chronic, primary psychotic disorders (such as schizophrenia), particularly in individuals with pre-existing genetic or clinical vulnerability. A meta-analysis of over 40,000 individuals found that cannabis-induced psychosis carries the highest rate of conversion to persistent schizophrenia (34%, 95% CI 25%–46%) among all substance-induced psychoses. Umbrella and systematic reviews also confirm associations with earlier onset and relapse in psychotic spectrum disorders.

2:00:00Chris Williamson (host)supportedhigh

No fatal overdose deaths have been documented solely from the toxic effects of consuming THC.

"cannabis, no one's died from overdosing on THC apart from I don't know you get into a car accident." (said at 2:00:00)

A national retrospective study of medicolegal files in Australia (2000–2018) examining cannabis-related deaths found no cases of death caused solely by acute cannabis or THC toxicity. Fatalities associated with cannabis were instead attributable to trauma (such as motor vehicle accidents), suicide, co-ingested substances, or underlying natural disease.

2:07:47Tom Segurasupportedhigh

Creatine is used as a cutting agent or adulterant in illicit cocaine.

"You used to cut cocaine with creatine, right? Used to they would cut cocaine with creatine. Really? It's a cut, yeah." (said at 2:07:47)

Chemical and forensic analyses of illicit drug supplies consistently confirm that creatine is used as a cutting agent (diluent/adulterant) in street and online cocaine samples, alongside other typical adulterants such as caffeine, levamisole, lidocaine, lactose, and mannitol.

1:34:38Andrew Hubermansupportedhigh

Catecholamines (dopamine, norepinephrine, and epinephrine) are released in the brain and body during high-arousal situations.

"The catecholamines is dopamine, norepinephrine, and epinephrine. The catecholamines is this little kit of of chemicals that are made in our brain and body, right? Different ones, different places, etc. We don't have to get into that, but that cocktail is what's released under, you know, high arousal situations." (said at 1:34:38)

Catecholamines consist of dopamine, norepinephrine, and epinephrine, which are synthesized centrally in the brain and peripherally in the sympathetic nervous system and adrenal medulla. During high-arousal and acute stress states (such as the fight-or-flight response), these neurochemicals are released across the brain and body to coordinate cardiovascular, metabolic, and cognitive adaptations.

1:35:37Andrew Hubermansupportedmoderate

After orgasm, dopamine levels drop and prolactin rises, establishing the sexual refractory period.

"And then after orgasm, dopamine goes down and a and a hormone, which is basically a hormone, prolactin goes up, and that sets the refractory period, during which time you need a higher stimulus thing to get you aroused again." (said at 1:35:37)

Published human physiological studies demonstrate that orgasm triggers a marked release of prolactin, which is associated with sexual satiety and the post-orgasmic refractory period. Experimental manipulation of prolactin via the dopamine D2 agonist cabergoline lowers post-orgasmic prolactin levels and significantly shortens or improves the refractory period, supporting the role of acute prolactin surges and associated dopaminergic tone in regulating post-orgasmic sexual inhibition.

1:36:13Andrew Hubermansupportedhigh

Prescription drugs such as cabergoline inhibit prolactin secretion.

"Um you know, there are drugs which I don't recommend people take, but these prescription drugs like cabergoline and things like that, which um in inhibit prolactin." (said at 1:36:13)

Cabergoline is a potent dopamine D2 receptor agonist that directly suppresses pituitary lactotroph function and inhibits prolactin secretion. It is standard prescription therapy for hyperprolactinemia, prolactin-secreting pituitary adenomas, and lactation suppression, with extensive randomized controlled trial and systematic review evidence demonstrating marked reductions in circulating prolactin levels.

1:36:41Andrew Hubermansupportedmoderate

Taking a hot shower paradoxically lowers core body temperature through a compensatory thermoregulatory drop.

"Hot shower. shower, right? Paradoxically is going to lower your core body temperature. You need your body temperature to start dropping to get to sleep. Okay, which is we can talk about why that happens, but you heat up the outside of your body, then there's this compensatory drop." (said at 1:36:41)

A systematic review and meta-analysis confirms that water-based passive body heating (such as a warm shower or bath at 40–42.5 °C) taken 1 to 2 hours before bedtime aids sleep onset by promoting a subsequent decline in core body temperature. The mechanism involves increased blood flow to distal areas (such as the hands and feet) and vasodilation, which accelerates body heat dissipation and results in a compensatory drop in core temperature.

1:36:56Andrew Hubermansupportedhigh

Deliberately exhaling activates a descending branch of the vagus nerve and triggers respiratory sinus arrhythmia to slow heart rate.

"Normally we passively exhale, but when you deliberately exhale, you slow your heart rate down. It activates a descending branch of your vagus nerve, which goes to your heart. It activates something called respiratory sinus arrhythmia, which sounds bad, arrhythmia, but it's actually good. It's like the break on your heart rate. It's the basis of heart rate variability." (said at 1:36:56)

The claim accurately describes the physiological mechanism of respiratory sinus arrhythmia (RSA). During exhalation, cardiac vagal efferent activity to the heart's sinoatrial node increases, causing the heart rate to slow down. RSA is defined as these rhythmic fluctuations in heart rate synchronized with respiration (accelerating during inhalation and slowing during exhalation) and forms the primary component of high-frequency heart rate variability (HRV).

1:38:54Andrew Hubermansupportedhigh

Quviviq is a dual orexin receptor antagonist (DORA) that acts on the hypocretin-orexin system to improve REM sleep.

"There's a prescription drug called Quviviq which is in a class of drug called the DORAs, which works on the hypocretin-orexin system. Yeah, it's very expensive, but that seems to improve uh REM sleep." (said at 1:38:54)

Quviviq (daridorexant) is an FDA-approved dual orexin receptor antagonist (DORA) that acts by blocking the wake-promoting orexin (hypocretin) neuropeptide system. Clinical trials evaluating sleep architecture have demonstrated that daridorexant dose-dependently increases rapid eye movement (REM) sleep duration and the probability of transitions into REM sleep, unlike traditional GABAergic hypnotic agents which often suppress REM sleep.

1:39:28Andrew Hubermansupportedvery low

Administering melatonin to Siberian dwarf hamsters causes their testicles to shrink to the size of a grain of rice.

"Yeah, years ago I used to work on these a little side Siberian dwarf hamsters and and they're seasonal breeders and if they if you give them melatonin like their their balls shrink to the size of a grain of rice." (said at 1:39:28)

The speaker's claim is supported by animal research on Siberian (Djungarian) hamsters (Phodopus sungorus). Siberian dwarf hamsters are seasonal breeders whose reproductive systems regress during winter. Administering melatonin (via timed subcutaneous injections, infusions, or oral feeding) mimics short-day photoperiods and reliably induces profound testicular regression and atrophy. Because the evidence is derived exclusively from rodent laboratory models, the GRADE certainty is very low.

1:40:24Andrew Hubermansupportedlow

Melatonin helps keep puberty at bay, and changes in melatonin secretion patterns correlate with the onset of puberty.

"Melatonin helps keep puberty at bay. And then that there's a switch in the patterns of melatonin secretion that it's not the only thing, but it correlates with puberty." (said at 1:40:24)

A systematic review and meta-analysis evaluating melatonin secretion across pubertal development confirmed that nocturnal and average melatonin concentrations significantly decline with advancing Tanner stages. Animal and neuroendocrine models also demonstrate an inhibitory (antigonadotropic) influence of melatonin on the hypothalamic-pituitary-gonadal axis, supporting the hypothesis that changes in melatonin secretion patterns correlate with pubertal progression. Because evidence in humans is primarily derived from observational studies rather than interventional trials, certainty is graded as low.

1:35:41Andrew Hubermansupportedhigh

The Coolidge effect describes a phenomenon in animals where males exhibit renewed sexual interest and copulatory capacity when presented with novel females.

"the Coolidge effect, like in roosters, this whole thing, if you trade out the hens, then they can continue to copulate over and over again. This to some extent is is true in humans" (said at 1:35:41)

The speaker's description of the Coolidge effect—a phenomenon wherein sexually satiated animals show renewed sexual interest and copulatory capacity when introduced to novel receptive partners, which also applies to some extent in humans—is accurate and supported by established literature in animal behavior and human evolutionary psychology. Reviews and empirical studies demonstrate that male animals (such as rats) exhibiting sexual satiety after repeated mating with the same female regain copulatory behavior (mounts, intromissions, and ejaculatory motor patterns) when presented with a novel female partner (PMID: 28912031, PMID: 22564534, PMID: 24677685). Studies in humans also find evidence for sex-specific preferences for sexual variety and novelty in short-term mating contexts consistent with the Coolidge effect (PMID: 32440927).

2:05:29Andrew Hubermansupportedhigh

In psychosis, clang associations occur when individuals associate words based on their phonetic sounds rather than their meaning.

"There's this thing in psychosis called clang associations where people who are psychotic start to associate the sound of a word, like the phonetics of it, with the meaning." (said at 2:05:29)

In psychiatric literature and formal thought disorder assessment scales (such as the Thought, Language and Communication [TLC] scale and the Scale for the Assessment of Positive Symptoms [SAPS]), clang associations (or clanging) are defined as a pattern of speech seen in psychosis and mania where word choice is governed by phonetic sound qualities—such as rhyming, puns, or alliteration—rather than semantic meaning or logical progression.

2:06:17Andrew Hubermansupportedhigh

Pareidolia is the psychological phenomenon where individuals perceive recognizable patterns or images, such as faces or animals, in ambiguous visual stimuli.

"There's something called pareidolia which is like people look at clouds and they'll be like, oh my god, it looks like like a puppy dog or something." (said at 2:06:17)

The claim is accurate and consistent with the established scientific definition. Pareidolia is a recognized perceptual phenomenon in which the human visual system perceives meaningful or recognizable patterns, such as faces, animals, or objects, in ambiguous stimuli (e.g., clouds, white noise, or inanimate objects). Research confirms that pareidolia involves both bottom-up perceptual mechanisms and top-down cognitive processes, commonly manifesting as seeing visual patterns in ambiguous inputs.

2:15:47Chris Williamson (host)supportedvery low

The monitored human record for voluntary sleep deprivation was set by Randy Gardner at 11 days and 25 minutes (264 hours).

"The record is set by Randy Gardner, a 17-year-old high school student in California as part of a science fair experiment. Researchers monitored him throughout and it was 11 days, 25 minutes, which is 264 hours." (said at 2:15:47)

The scientific record confirms that in 1964, 17-year-old Randy Gardner stayed awake for 264 hours (11 days and approximately 25 minutes) as part of a high school science fair project, during which he was monitored by sleep researchers including William Dement and John J. Ross. The psychiatric and electroencephalographic observations from this case were formally documented in a 1966 case report. Because this evidence consists of a single monitored case report, the certainty of evidence for human physiological limits derived from this observation is very low.

2:17:34Andrew Hubermansupportedhigh

A healthy human circadian rhythm is characterized by a prominent cortisol peak in the morning that gradually subsides throughout the day.

"inflammation kind of like cortisol, right? You meant to have this big cortisol peak in the morning and that subsides. That's super healthy. That's the healthy pattern, but if you start staying awake, it starts getting jagged line" (said at 2:17:34)

The speaker's description of healthy human cortisol dynamics is supported by extensive endocrine literature. Under normal physiological conditions, cortisol secretion follows a robust circadian rhythm governed by the hypothalamic-pituitary-adrenal (HPA) axis and the suprachiasmatic nucleus, characterized by a sharp rise and peak in the early morning (including the cortisol awakening response) followed by a steady decline across the day to a nadir around midnight.

2:15:22Andrew Hubermansupportedmoderate

Sleep serves to downregulate systemic inflammation and synchronize the circadian clocks of peripheral organs such as the liver and stomach.

"during sleep, your the whole reset of the body is like tamping down inflammation, coordinating the different organs of your body, like getting them back in check. Like all like your your, you know, your liver and your and your stomach, they're they're working on different time scales, but they need to be like kind of nudged into place like an orchestra." (said at 2:15:22)

The statement that sleep and circadian timing reduce systemic inflammation and align the body's peripheral organ clocks (such as the liver and stomach) is supported by scientific evidence. A meta-analysis of human studies found that sleep disturbance is associated with elevated levels of circulating inflammatory markers, including C-reactive protein (CRP) and interleukin-6 (IL-6). Furthermore, established chronobiology demonstrates that a central master clock in the suprachiasmatic nucleus (SCN), along with sleep-wake and metabolic cues, synchronizes subordinate peripheral clocks across organs, including the liver and stomach, maintaining temporal order across bodily tissues.

2:17:14Andrew Hubermansupportedhigh

Baseline systemic inflammation progressively increases with age.

"Just global levels of of inflammation. As you get older, just inflammation increases." (said at 2:17:14)

A large body of scientific and clinical evidence confirms that advancing age is characterized by a progressive, sterile, low-grade elevation in baseline systemic inflammation, a well-established phenomenon termed 'inflammaging'. It arises from an imbalance between pro- and anti-inflammatory pathways driven by cellular senescence, immunosenescence, accumulated cellular debris, and lifelong exposure to stressors.

2:31:54Andrew Hubermansupportedhigh

Short-wavelength ultraviolet (UV) light can damage the DNA in human skin cells.

"UV light, right? Short wavelength light can damage the DNA in your skin cells." (said at 2:31:54)

Ultraviolet (UV) radiation—which comprises shorter wavelengths than visible light—directly and indirectly damages DNA in human skin cells. Direct absorption of UV photons by nuclear DNA produces photolesions such as cyclobutane pyrimidine dimers (CPDs) and pyrimidine (6-4) pyrimidone photoproducts, as well as oxidative lesions (such as 8-oxo-dG) generated by reactive oxygen species. Unrepaired lesions lead to characteristic mutations, cell death, photoaging, and skin carcinogenesis.

2:32:08Andrew Hubermansupportedhigh

Rayleigh scattering filters out UV light when the sun is low in the sky, making the UV index low in the early and late parts of the day.

"the UV index is low when the sun is low in the sky... There's something called Rayleigh scattering and a lot of the UV gets filtered out." (said at 2:32:08)

Atmospheric radiative transfer physics confirms that surface ultraviolet (UV) irradiance and the UV index vary strongly with the solar zenith angle. When the sun is low in the sky (such as during early morning and late afternoon), sunlight traverses a substantially longer atmospheric path length (air mass). Because Rayleigh scattering by air molecules is inversely proportional to the fourth power of wavelength, UV wavelengths experience substantial scattering and attenuation along this extended path, alongside absorption by stratospheric ozone, resulting in a very low UV index at low solar elevations.

2:32:39Andrew Hubermansupportedmoderate

Longer wavelengths of light, such as red and near-infrared, penetrate through clothing and tissue and support cellular mitochondrial function, as demonstrated by Glen Jeffery's laboratory at University College London.

"the yellows, the oranges, the reds, the near-infrared, and the infrared, which you can't see. That's the heat from the sun. And that stuff is really important for the mitochondria of your cells. And it actually can go through your body. This was demonstrated by my friend Glen Jeffery from University College London. Even if you have a T-shirt, that's the good stuff." (said at 2:32:39)

Research led by Glen Jeffery's laboratory at University College London has demonstrated that longer wavelengths of light (red and near-infrared, approximately 650–1,000+ nm) penetrate human tissue and clothing (such as T-shirt fabric) and stimulate mitochondrial activity, increasing ATP production and mitochondrial membrane potential. In experimental human studies, thoracic exposure to near-infrared light (830–860 nm) penetrated the body even through clothing and produced systemic improvements in visual and metabolic function.

2:33:05Andrew Hubermansupportedhigh

Standard LED lights do not emit long-wavelength light such as near-infrared and infrared light, unlike sunlight, firelight, and some incandescent bulbs.

"So you want that long-wavelength light. It's not present in LEDs, okay? It's present in some incandescent bulbs. It's present in in candlelight and firelight. It's present in sunlight." (said at 2:33:05)

Standard commercial lighting LEDs (such as phosphor-converted white LEDs) produce light strictly within the visible spectrum (approximately 400 to 700 nm) with negligible near-infrared (NIR) or infrared (IR) emissions. In contrast, thermal and combustion sources (such as sunlight, candlelight, firelight, and incandescent bulbs) radiate via blackbody emission, releasing a broad spectrum that contains substantial portions of near-infrared and infrared radiation. Sunlight, for example, contains over 40% of its energy in the near-infrared band.

2:33:35Andrew Hubermansupportedmoderate

Chemical-based sunscreens contain endocrine disruptors, whereas mineral sunscreens using zinc oxide only do not.

"Sunscreen typically blocks the UV, okay? And there's sunscreen and sunblock, and it gets kind of nuanced, but if you are worried about the endocrine disruptors, or you're worried about the coral reefs, right, and the disruption to the oceans that are caused by sunscreens... Just use a mineral-based sunscreen, mineral only. So, zinc oxide only." (said at 2:33:35)

Published toxicology, epidemiological, and regulatory reviews confirm that several common chemical (organic) UV filters, notably benzophenones such as oxybenzone (BP-3) and octylmethoxycinnamate, demonstrate endocrine-disrupting properties and are absorbed systemically into the bloodstream. In contrast, mineral UV filters, specifically zinc oxide, do not penetrate viable skin layers to enter systemic circulation, do not exhibit hormonal or endocrine-disrupting activity, and remain classified by regulatory bodies like the US FDA as generally recognized as safe and effective (GRASE). Furthermore, organic UV filters have been implicated in marine ecosystem toxicity and coral bleaching, prompting regulatory restrictions in several jurisdictions where mineral alternatives are recommended.

2:34:41Andrew Hubermansupportedmoderate

LED lighting is heavily blue-shifted and short-wavelength light can impair mitochondrial function independent of circadian rhythm disruption.

"are LED lights bad? Well, they're not really bad, but they're really blue-shifted. And they're really short wavelength-shifted. And it's not just about disrupting your circadian rhythm... And that whole thing around LEDs maybe causing problems for mitochondria, which is what the short-wavelength light can do, independent of the effects on sleep, was considered kind of crazy quack science until Glen Jeffery's lab started looking at this." (said at 2:34:41)

Research from Glen Jeffery's laboratory and related photobiology groups demonstrates that short-wavelength blue light (~400–450 nm, with peak absorption around 420 nm) directly impacts mitochondrial function. Mitochondria absorb 420 nm light via porphyrins in cytochrome-c oxidase within the electron transport chain, leading to increased inner membrane permeability, reduced respiratory complex activity, metabolic instability, and decreased ATP production. This cellular mechanism operates independently of retinal ganglion cell-mediated circadian rhythm pathways.

2:35:41Andrew Hubermansupportedhigh

Infrared light from the sun reflects off of greenery and plant foliage.

"if you really want to enhance the effect, you get outside where there's a lot of greenery, because some of that infrared light actually reflects off the greenery." (said at 2:35:41)

Plant foliage and green canopies strongly reflect solar near-infrared radiation. While photosynthetic pigments like chlorophyll absorb heavily in the visible spectrum (particularly red and blue light), the internal cellular architecture of leaves (spongy mesophyll) scatters and reflects a large portion of incident near-infrared light (400–2500 nm spectrum). This optical phenomenon is well-established and forms the foundational basis for remote sensing vegetation indices and canopy reflectance models.

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.