Magnesium Glycinate vs Citrate (2026): How They Differ
Not medical advice — this summarizes published research; talk to a clinician before starting magnesium, especially with kidney disease. Methodology.
Both forms are well absorbed. Glycinate is often described as the gentler on the stomach; citrate has a mild laxative effect. Priced on the same 400 mg elemental comparison amount (above the 350 mg limit, used only to compare) citrate is about 23 cents a day cheaper — $0.39/day for the cheapest glycinate capsule or tablet we track versus $0.16/day for the cheapest citrate. Glycinate powder is closer: $0.23/day. Keep supplemental magnesium at or under 350 mg/day unless a clinician advises otherwise.
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Quick answer: both forms are well absorbed. Magnesium glycinate is chelated with glycine and is often described as the gentlest common form. Magnesium citrate pulls water into the bowel, so it has a mild laxative effect, especially at higher amounts. Both are far better absorbed than magnesium oxide, which is only about 4% absorbed (PMID: 11794633). Ask your clinician before starting a supplement.
Glycinate and Citrate at a Glance
| Feature | Form | Note |
|---|---|---|
| Stomach tolerance | Glycinate | Often described as the gentlest of the common forms; citrate and oxide can loosen stools at higher amounts |
| Osmotic (laxative) effect | Citrate | Pulls water into the bowel; glycinate is chelated to avoid that effect |
| Absorption | Either | Both well absorbed; the price gap per equal amount is small |
| Using both | Both | Keep the combined total at or under 350 mg supplemental magnesium a day |
Magnesium Glycinate vs Citrate: Head-to-Head Comparison
| Factor | Magnesium Glycinate | Magnesium Citrate |
|---|---|---|
| Overview | Well absorbed; often described as gentle on the stomach | Well absorbed; mild osmotic laxative effect |
| Bioavailability | High — among the best-absorbed forms in comparative studies (PMID: 11794633) | Moderate to high — well absorbed, clearly better than oxide (~4%) |
| Digestive side effects | Often described as the gentlest of the common forms | Moderate — osmotic laxative effect, especially at higher amounts |
| Carrier | Glycine, an amino acid | Citric acid |
| Elemental Mg per gram of compound | ~14% (need more compound per amount) | ~16% (slightly more efficient by weight) |
| Compound needed for 400 mg elemental | ~2,850 mg of glycinate | ~2,500 mg of citrate |
| Cheapest 400 mg elemental amount we track | $0.39/day | $0.16/day |
| Registry-confirmed options | Nature Made Magnesium Glycinate 200mg (USP Verified), Thorne Magnesium Glycinate (NSF/ANSI 173), BulkSupplements Magnesium Glycinate Powder (NSF/ANSI 173) | None of the citrates we track is confirmed in a public registry; some listings show a badge we did not find there |
| Taste/form | Capsules, tablets, powder (mild/chalky) | Capsules, tablets, powder, liquid (tart/citrus) |
Is Magnesium Glycinate Better Than Magnesium Citrate?
Neither form is better in general. Both are well absorbed. Glycinate is often described as gentler on the stomach, and citrate has a laxative pull. No trial has compared the two forms head to head on tolerance.
The magnesium atom is identical in both; what differs is the carrier molecule and what it does on the way through. Glycine is an amino acid; citrate draws water into the bowel.
Digestive Effects
Citrate pulls water into the bowel — an osmotic effect that can loosen stools, especially at higher amounts. Glycinate is chelated with glycine and is usually described as gentler on the stomach, though no trial has compared diarrhea rates between forms at the same elemental dose. Ask your clinician about any use of magnesium for digestive reasons.
Which Is Cheaper per Amount?
Compared on the same 400 mg elemental magnesium amount (used here only to compare; it is above the 350 mg supplemental limit) rather than on price per bottle, the cheapest glycinate capsule or tablet we track (Nature Made Magnesium Glycinate 200mg) works out to $0.39/day and the cheapest citrate (NOW Magnesium Citrate 200 mg (250 Tablets)) to $0.16/day. That is a difference of 23 cents a day. The cheapest glycinate powder, BulkSupplements Magnesium Glycinate Powder, costs $0.23/day.
These costs are per 400 mg of elemental magnesium, so the difference in how much of each compound is magnesium (citrate about 16% by weight, glycinate about 14%) is already taken out. The gap is the price of the products themselves.
Elemental vs Compound Weight
This is the most common source of dosing confusion, and it is where the two forms genuinely differ on the label. Supplement labels may list either the elemental magnesium or the total compound weight. To reach 400 mg elemental you would need roughly 2,850 mg of magnesium glycinate compound or 2,500 mg of magnesium citrate compound.
How to read the label: find the Supplement Facts line that says "Magnesium" with the form in parentheses — for example, "Magnesium (as Magnesium Glycinate) ... 200 mg". The number before "mg" is the elemental magnesium, and that is the number that counts toward your daily total and toward the 350 mg supplemental upper limit. Full breakdown in our magnesium dosage guide.
The same compound-weight trap is the whole story of magnesium gummies, where the shelf is almost entirely citrate and the median serving delivers 100 mg.
What About Magnesium Oxide?
Magnesium oxide is the cheapest and most widely available form, but it has the lowest bioavailability of the common forms — around 4% absorbed. A comparative study of magnesium preparations (PMID: 11794633) found that organic forms like glycinate and citrate were significantly better absorbed than oxide. Despite its low cost per bottle, oxide often has a higher cost per absorbed amount — and it carries the highest elemental fraction (~60%), which is exactly why the label number misleads. Oxide is sold mainly as an antacid or occasional laxative.
Magnesium Glycinate Products We Track
| Product | Elemental Mg | Cost/Day | Per 400 mg | Certification |
|---|---|---|---|---|
| BulkSupplements Magnesium Glycinate Powder (250 g) · Buy on Amazon | 300mg | $0.23 | $0.23 | NSF/ANSI 173 (confirmed in registry) |
| Vitamin Shoppe Magnesium Glycinate 400 mg (135 tablets) · Buy on Amazon | 400mg | $0.44 | $0.44 | None stated |
| Nature Made Magnesium Glycinate 200mg · Buy on Amazon | 200mg | $0.39 | $0.39 | USP Verified (confirmed in registry) |
Magnesium Citrate Products We Track
| Product | Elemental Mg | Cost/Day | Per 400 mg | Certification |
|---|---|---|---|---|
| NOW Magnesium Citrate 200 mg (250 Tablets) · Buy on Amazon | 400mg | $0.16 | $0.16 | None stated |
| Nature Made Magnesium Citrate 250 mg (120 Softgels) · Buy on Amazon | 250mg | $0.41 | $0.41 | USP Verified (confirmed in registry) |
| Natural Vitality Calm Magnesium Citrate Powder (16 oz) · Buy on Amazon | 325mg | $0.17 | $0.17 | None stated |
See our full product comparison for all 6 glycinate products with detailed deep dives, or the best magnesium ranking across every form.
Frequently Asked Questions
Is magnesium glycinate better than magnesium citrate?
Neither form is better in general. Both are well absorbed. Glycinate is often described as gentler on the stomach; citrate has an osmotic laxative pull. They deliver the same mineral, and at a 400 mg elemental comparison dose they cost close to the same, so tolerability should decide it, not price. No trial has compared the two forms head to head on stomach tolerance.
How do glycinate and citrate differ in digestive effects?
Citrate draws water into the bowel, an osmotic effect that can loosen stools, especially at higher amounts. Glycinate is chelated with glycine and is usually described as gentler, though no trial has compared diarrhea rates between forms at the same elemental dose.
Can you take magnesium glycinate and citrate together?
Some people do. What matters is the total: keep combined supplemental elemental magnesium at or below the NIH tolerable upper intake level of 350 mg per day unless a clinician advises otherwise. Read the elemental magnesium figure on each label, not the compound weight, or you will undercount.
Which is cheaper, magnesium glycinate or magnesium citrate?
Priced on the same 400 mg elemental amount, the cheapest glycinate capsule or tablet we track is $0.39/day and the cheapest citrate is $0.16/day, 23 cents apart. Glycinate powder costs $0.23/day.
Which magnesium is easiest on the stomach?
Magnesium glycinate is usually described as the gentlest of the common forms, though no trial has compared diarrhea rates between forms at the same elemental dose. It is chelated with glycine, which avoids most of the osmotic water-drawing effect associated with citrate and oxide. Magnesium oxide is the least absorbed, at roughly 4 percent, and is associated with loose stools.
Related Comparisons
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- All Magnesium Guides
Sources
- Firoz M, Graber M. "Bioavailability of US commercial magnesium preparations." Magnes Res. 2001;14(4):257-62. PMID: 11794633
- NIH Office of Dietary Supplements. "Magnesium: Fact Sheet for Health Professionals." ods.od.nih.gov