Magnesium glycinate has an 80 percent absorption rate.
"A much better form of magnesium would be to take magnesium glycinate. First of all, you won't have the GI problems, you won't have diarrhea. Secondly, you absorb 80%" (said at 0:04:48)
While magnesium glycinate (magnesium diglycinate) is generally well-tolerated with less laxative effect than inorganic salts like magnesium oxide, clinical and physiological data do not support an 80% absorption rate. In human stable isotope studies assessing fractional absorption, oral magnesium absorption generally ranges between 20% and 50% depending on dosage, individual magnesium status, and formulation. For example, a randomized crossover trial measuring 26Mg-labeled magnesium diglycinate absorption observed a fractional absorption rate of approximately 23.5%. Claiming an 80% absorption rate substantially overstates human magnesium bioavailability.
- contradicts: Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resecti… (JPEN. Journal of parenteral and enteral nutrition 1994)
"For the patient group as a whole, 26Mg absorption was low but was not different for the two supplements (23.5% vs 22.8% for magnesium chelate and MgO, respectively). However, 26Mg absorption was substantially greater from the chelate (23.5% vs 11.8%; p < .05) in the four patients who showed the greatest impairment of magnesium absorption with MgO and was better tolerated by all patients." (abstract, results, passage verified)
pubmedfull study (doi)