RESEARCH MONOGRAPH · KDC-MN-168

Magnesium Glycinate

May 9, 2026 Kodiac biolabs Research Revised May 30, 2026 2 min read

Our opinion on this compound

77/100

The workhorse magnesium form, well-tolerated, decent absorption, surprisingly hard to source clean

Magnesium glycinate is a chelate of magnesium with two glycine molecules, sometimes called magnesium bisglycinate or Mg(Gly)2. The premise is that the glycine binding stabilizes the magnesium through the GI tract, reduces the osmotic load that causes diarrhea with cheaper inorganic forms (oxide, sulfate), and presents the cation to absorption sites with better bioavailability than the inorganic salts.

That premise is largely supported by the literature. Comparative absorption studies put glycinate (and other amino acid chelates like malate, citrate, taurate) above oxide and similar to or above sulfate in terms of net magnesium retention. The tolerability advantage at higher doses is the more reliable effect, glycinate doesnt produce the laxative effect that limits oxide and citrate at 400mg+ elemental.

There's an additional glycine component that's not nothing. Free glycine at supplemental doses (3g+) has its own pharmacology, including mild sleep-onset effects via inhibitory glycine receptors and NMDA glycine-site modulation. A 400mg elemental magnesium dose from glycinate delivers roughly 1.5-2g of glycine concurrently, which is enough to do glycine-receptor work in addition to whatever the magnesium is doing. Most marketing pages dont mention this and it's actually a real part of the effect profile.

Sourcing is where this category gets messy. A lot of products labeled magnesium glycinate are actually magnesium glycinate buffered with magnesium oxide, sometimes 50-70% oxide by mass, with only a fraction as true chelate. This shows up in third-party testing regularly. True bisglycinate (Albion's TRAACS Magnesium Bisglycinate Chelate or equivalent) is more expensive and worth specifying.

Safety profile is clean. Magnesium has a wide therapeutic window in normal renal function, and glycine is endogenous at gram-scale.

What we like: the most tolerated absorption-efficient magnesium form, and the glycine co-delivery is a real bonus the literature mostly ignores. What we dont like: the buffered-glycinate-mostly-oxide problem in the supplement market, which means most consumers are paying for one product and getting another.

For research purposes, specify true chelate and verify the elemental percentage. The form is fine, the QC story is where you can get burned.

Evidence: 72
Mechanism: 75
Reliability: 80
Safety: 92
Sourcing: 65
Value: 80
Signal: 75
Staying power: 80

Plain-language summary Intrigue 50 / 100

Magnesium glycinate (also called magnesium bisglycinate) is magnesium bound to two glycine molecules. Glycine is also a calming amino acid, and the combination is well tolerated and absorbed without GI side effects. Not stocked by Kodiac. This monograph is provided for research and educational reference.

Intrigue 0–100 blends mechanism novelty, evidence strength, and translational potential. Kodiac editorial, not peer-reviewed.

Magnesium-glycine chelate

A magnesium chelate with glycine, with superior bioavailability and minimal gastrointestinal effects compared with magnesium oxide.

Abstract

Magnesium glycinate (magnesium bisglycinate) is a chelated magnesium salt where magnesium is bound to two molecules of glycine. The compound has superior bioavailability compared with magnesium oxide (the most common but poorly absorbed form), with absorption rates approaching 80 percent in clinical studies versus 4 to 12 percent for oxide. Glycine has independent anxiolytic and sleep-promoting effects through NMDA glycine site activity. The combination produces a magnesium product with low gastrointestinal disturbance and additional glycine benefits at the dosing required for elemental magnesium repletion. Reported research dose ranges in the literature are described in the source publications.

Mechanism of action

Magnesium chelate with glycine; high bioavailability. Glycine adds NMDA co-agonist activity.

Reported research dose ranges

Reported research dose ranges in the literature.

References

Schuette SA, et al. Bioavailability of magnesium diglycinate. JPEN 1994.

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KDC-MN-168

The full reference document is provided strictly for research use only. It reports research dose ranges from the published literature, not instructions for use in humans or animals.

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FOR RESEARCH USE ONLY. Not for medical, diagnostic, or therapeutic purposes. Not for human consumption. All information is provided for research and educational purposes only.

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Magnesium Glycinate

Abstract

Mechanism of action

Reported research dose ranges

References

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Abstract

Mechanism of action

Reported research dose ranges

References

Read the full monograph

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