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Magnesium comparison

Magnesium Glycinate vs Magnesium Citrate

A practical comparison of their forms, typical supplement labels, considerations, and differences.

Last reviewed September 28, 20264 referencesNo universal winner
Quick answer

Both are organic magnesium salts that dissolve better than magnesium oxide, and both are common in supplements. Citrate has more published absorption research and is more likely to loosen stools — it’s also used in laxative products. Glycinate is often chosen by people who want a form less associated with digestive effects, but direct head-to-head research is limited. Neither is universally “better”: compare the elemental magnesium per serving, whether the product is a blend, other ingredients, and cost per 100 mg.

Magnesium Glycinate vs Magnesium Citrate
CompareGlycinateCitrate
FormMagnesium bound to glycine (bisglycinate chelate)Magnesium bound to citric acid
Elemental magnesium by weightSuppScout calculationApproximate, from molecular formulas; varies with hydration and blends~14%~16%
Typical product formatsCapsules, tablets, powdersPowders (drink mixes), capsules, tablets, liquids
Commonly researched usesPublished researchGeneral magnesium supplementation; little form-specific researchGeneral supplementation; absorption studies; laxative use at higher doses
Digestive effectsPublished researchCommonly marketed as gentle; limited comparative dataMore likely to loosen stools, especially at higher amounts
Absorption researchPublished researchLimited head-to-head data vs citrateHigher than oxide in several small studies
Dietary considerationsUsually vegan; check capsuleUsually vegan; powders may add sweeteners/flavors
Label watch-outs“Buffered” blends with magnesium oxideFlavors, sweeteners and citric acid in powders
Cost per 100 mg elemental (demo catalog)SuppScout calculationBased on fictional demonstration listings$0.09–$0.21 (demo)$0.08–$0.17 (demo)
AvailabilityWidely availableWidely available

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Who might look at each

Magnesium Glycinate

  • People who have had digestive upset with other forms
  • People who prefer capsules

Magnesium Citrate

  • People who prefer a drink powder
  • People comparing forms with more absorption research

These describe common reasons people consider each option — not a recommendation. There’s no universal winner.

Magnesium Glycinate and Magnesium Citrate, explained

Magnesium Glycinate

Magnesium glycinate (usually magnesium bisglycinate chelate) is magnesium bonded to the amino acid glycine. Because glycine is heavy relative to magnesium, glycinate carries about 14% elemental magnesium by weight, so reaching 200 mg often takes two to four capsules. Read the full glycinate overview.

Magnesium Citrate

Magnesium citrate is magnesium combined with citric acid. It dissolves readily in water, which is why it’s common in drink powders — and why, at higher doses, it’s used as an osmotic laxative. Read the full citrate overview.

Key differences

  • Digestive effect. Citrate draws water into the intestines and is more likely to loosen stools; glycinate is generally chosen for tolerability, though comparative data are limited.
  • Research depth. Citrate appears in more absorption studies (usually compared with oxide). Glycinate-specific research is thinner.
  • Label blends. Glycinate products are frequently “buffered” with magnesium oxide; citrate products are less often blended.
  • Formats. Citrate is often sold as a flavored drink powder; glycinate is mostly capsules.

Similarities

  • Both are organic magnesium salts that dissolve better than oxide.
  • Both carry a similar share of elemental magnesium (roughly 14–16%).
  • The same 350 mg/day adult upper limit for supplemental magnesium applies to both.
  • Both are usually vegan and widely available.
Published research

Research overview

Most comparative absorption studies pit organic salts like citrate against magnesium oxide, and citrate generally comes out ahead on short-term absorption markers. Few studies compare glycinate directly with citrate in healthy adults, and none that SuppScout has reviewed compares them on long-term health outcomes. When a product claims its form is “the most absorbable”, treat that as a marketing claim unless it cites comparative human data.[1][2][3][4]

How to read product labels

  • Confirm the milligram amount is elemental magnesium (it almost always is on the Supplement Facts panel).
  • Read the parentheses: “(as magnesium bisglycinate chelate, magnesium oxide)” means a blend.
  • Count capsules per serving — 200 mg of glycinate usually means 2–4 capsules.
  • For powders, check sweeteners and flavors in “Other ingredients”.
  • Compare cost per 100 mg elemental magnesium, not cost per bottle.

Full guide: how to read a supplement label

Products containing each

Magnesium Glycinate

Primary ingredient
Magnesium Glycinate
Per serving
200 mg elemental magnesium
Servings
60
Format
Capsules
Price
$24.99*
Per serving cost
$0.42
Manufacturer claim only

Plainlabel Magnesium Glycinate

Plainlabel Nutrition · Demo
Primary ingredient
Magnesium Glycinate
Per serving
200 mg elemental magnesium
Servings
120
Format
Capsules
Price
$29.99*
Per serving cost
$0.25
Not verified
Magnesium Glycinate overview →

Magnesium Citrate

Primary ingredient
Magnesium Citrate
Per serving
150 mg elemental magnesium
Servings
60
Format
Capsules
Price
$14.99*
Per serving cost
$0.25
Not verified
Primary ingredient
Magnesium Citrate
Per serving
300 mg elemental magnesium
Servings
90
Format
Powder
Price
$21.99*
Per serving cost
$0.24
Not verified
Magnesium Citrate overview →
Product vs product
Two “magnesium glycinate” bottles — why is one so much cheaper per 100 mg? →

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Frequently asked questions

Is magnesium glycinate or citrate better for sleep?

There isn’t good head-to-head evidence either way. Research on magnesium and sleep in general is limited and low quality, and form-specific sleep research is sparser still. See the magnesium evidence overview.

Can I take glycinate and citrate together?

Some products combine them. What matters for safety is the total supplemental magnesium — the adult upper limit is 350 mg/day from supplements combined. Speak with a clinician before exceeding it.

Why is my glycinate cheaper than other glycinates?

Check for a blend. “Buffered” glycinate often includes magnesium oxide, which is cheaper and denser in magnesium. See this product comparison.

References

  1. Magnesium: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.govGovernment
  2. Walker AF, Marakis G, Christie S, Byng M (2003). Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study. Magnesium Research 16(3). pubmed.ncbi.nlm.nih.govRandomized trial
  3. Lindberg JS, Zobitz MM, Poindexter JR, Pak CY (1990). Magnesium bioavailability from magnesium citrate and magnesium oxide. Journal of the American College of Nutrition 9(1). pubmed.ncbi.nlm.nih.govStudy
  4. Mah J, Pitre T (2021). Oral magnesium supplementation for insomnia in older adults: a Systematic Review & Meta-Analysis. BMC Complementary Medicine and Therapies 21:125. pubmed.ncbi.nlm.nih.govMeta-analysis

SuppScout links to primary and authoritative sources wherever possible. See our editorial policy for how sources are selected and how corrections are handled.

MAGNESIUM

Glycinate vs Oxide

Elemental content, solubility and cost per 100 mg.

Compare →
MAGNESIUM

Citrate vs Oxide

The best-studied pair of magnesium forms, side by side.

Compare →

This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.