Form Comparison

Magnesium Glycinate vs Magnesium Malate

How magnesium glycinate and magnesium malate differ in elemental content, absorption, tolerance, and cost.

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Quick verdict. Both are gentle, well-absorbed organic forms with similar elemental content (14.1% vs 15.5%), and no trial separates their absorption. The difference is the carrier: glycine has small trials for subjective sleep quality, which suits evening dosing, while malate is the traditional daytime choice. Either works for repletion.

Side by Side

Magnesium Glycinate Magnesium Malate
Elemental content 14.1% elemental magnesium 15.5% elemental magnesium
Absorption High High
How it is absorbed Magnesium bound to two glycine molecules. The chelate stays soluble across intestinal pH, and absorption proceeds through the same paracellular and TRPM6/7 channel routes as other soluble salts; head-to-head human data against citrate are limited. Soluble organic salt. Human pharmacokinetic data are thin; absorption is inferred from solubility and animal studies.
Typical dose 100-350 mg elemental magnesium daily 100-350 mg elemental magnesium daily
Common uses general repletion, sleep support, sensitive stomachs daytime use, muscle function, fatigue (weak evidence)
Side effects The least likely form to cause loose stools at typical doses. Generally well tolerated.
Cost Moderate Moderate
Also called magnesium bisglycinate, magnesium bisglycinate chelate, chelated magnesium dimagnesium malate
Labels in index 660 354

When to Choose Magnesium Glycinate

Choose magnesium glycinate when GI tolerance matters most or the dose is taken at bedtime. 200 mg elemental magnesium as bisglycinate delivers roughly 1.2 g of glycine, which has its own small trials for subjective sleep quality. Buffered products blend in oxide to raise elemental content; check the panel.

Magnesium Glycinate

Best general-purpose form when tolerance matters. Well absorbed and the least likely to loosen stools.

What to look for: Bisglycinate as the only form on the panel (not buffered with oxide), with elemental mg per serving stated. USP or NSF verified.

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When to Choose Magnesium Malate

Choose magnesium malate when you want a gentle, well-absorbed daytime form. Malate is a citric acid cycle intermediate, the rationale for its use in fatigue and fibromyalgia, where trials are small and mixed. Dimagnesium malate is about 20% elemental.

Magnesium Malate

A gentle, well-absorbed alternative for daytime dosing.

What to look for: Malate named alone on the panel. Avoid proprietary blends that do not state per-form amounts.

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Products on Titrate

In Titrate's index of NIH label data, 660 labels in the Magnesium category list magnesium glycinate and 354 list magnesium malate.

Open supplement search

Supplement Search loads one category at a time. Choose the Magnesium tab, then type a form such as "bisglycinate" under Must contain, or a form to avoid under Must not contain.

Related

References

NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals.

Firoz M, Graber M. Bioavailability of US commercial magnesium preparations. Magnes Res. 2001;14(4):257-262.

Kappeler D, et al. Higher bioavailability of magnesium citrate as compared to magnesium oxide shown by evaluation of urinary excretion and serum levels after single-dose administration in a randomized cross-over study. BMC Nutr. 2017;3:7.

Pardo MR, et al. Bioavailability of magnesium food supplements: A systematic review. Nutrition. 2021;89:111294.

Zhang X, et al. Effects of Magnesium Supplementation on Blood Pressure: A Meta-Analysis of Randomized Double-Blind Placebo-Controlled Trials. Hypertension. 2016;68(2):324-333.

Holland S, et al. Evidence-based guideline update: NSAIDs and other complementary treatments for episodic migraine prevention in adults. Neurology. 2012;78(17):1346-1353.

Garrison SR, et al. Magnesium for skeletal muscle cramps. Cochrane Database Syst Rev. 2020;9(9):CD009402.

Liu G, et al. Efficacy and Safety of MMFS-01, a Synapse Density Enhancer, for Treating Cognitive Impairment in Older Adults: A Randomized, Double-Blind, Placebo-Controlled Trial. J Alzheimers Dis. 2016;49(4):971-990.