Supplement Label Index

Magnesium Citrate vs. Magnesium Amino Acid Chelate

Among 6,062 on-market magnesium products with an identifiable primary form, 25.3% use Magnesium Citrate (1,533 products) and 4.6% use Magnesium Amino Acid Chelate (279).

Magnesium CitrateMagnesium Amino Acid Chelate
Quality tierTier 1Tier 2
Magnesium by weight16.2%
Share of market25.3%4.6%
On-market products1,533279
Median declared dose75 elemental mg
middle half: 24–150
83 elemental mg
middle half: 25–175
Most common brandsPure Encapsulations, Ultima, Douglas LaboratoriesNaturesPlus, Douglas Laboratories, MH Michael's Health Naturopathic Programs

Doses are declared per serving in elemental mg. “By weight” is the share of the ingredient that is the nutrient itself (e.g. elemental magnesium in a magnesium salt).

Why Magnesium Citrate is tier 1

Far more soluble than oxide across physiological pH; produced the highest urinary/salivary Mg response of forms tested in a human RCT.

Source: Lindberg 1990, PMID 2407766; Walker AF et al. 2003, Magnesium Research 16(3):183-191, PMID 14596323

Why Magnesium Amino Acid Chelate is tier 2

Lower urinary/salivary Mg response than citrate in one RCT, though "amino acid chelate" is not a single defined compound.

Source: Walker AF et al. 2003, PMID 14596323

Tiers summarize published comparative bioavailability or outcome evidence for each form (see methodology). This page describes the market; it is not a recommendation to take either form. Talk to a clinician about what's right for you.

Other magnesium comparisons