If you have compared two magnesium bottles and found one saying glycinate and the other bisglycinate, you have run into a naming convention, not a formulation difference. The more useful question is the one almost nobody in the search results answers: if the name on the front tells you nothing, what does? I read the
Eight randomised trials, mostly above 30 mg a day, with benefits concentrated in older adults and dialysis patients. Most Americans already get enough zinc.
A 200 mg magnesium dose carries about 1.2 g of glycine, just over 40% of the studied 3 g. Reaching 3 g that way would breach the magnesium safety limit.
Three small human trials, two with an author from the company that sells glycine, and a rat study ranking first on Google. What 3 g actually does, and what it costs.
The short answer Optimum Nutrition Gold Standard, 5 lb tub At 4.6 cents per gram of protein it is the cheapest of the six options priced below, and the gap is not small — the most expensive costs 67% more per gram for protein your body cannot tell apart. Its one real weakness is that no
About 368,000 people a month type magnesium glycinate for sleep into Google. For most of the time that phrase has been popular, the clinical evidence behind it came from a single trial of 46 elderly people that used a different form of magnesium at twice the dose. That changed in August 2025, when a university
In December 2022, NOW Foods bought sixteen magnesium glycinate products on Amazon, sent them to a laboratory, and published what it found. Almost none of them contained the chelated magnesium their labels claimed. The only ones that did were NOW’s own. That is either the most useful piece of consumer testing in this category or
Thorne’s magnesium bisglycinate is the product I expected to dislike. It is a powder, it costs more than any magnesium I have priced, and it is sold with the kind of athlete endorsement that usually signals marketing rather than chemistry. Then I checked the certification, and it turned out to be the one claim on
At 10.0 cents per 100 mg it is the cheapest magnesium I have priced, built on Albion TRAACS. But it is lysinate glycinate rather than bisglycinate, and two of its four ‘Certifications’ are badges the company made itself. Scored 7.5/10.