How much magnesium is in magnesium glycinate? 11.8–14.1% by weight, so 100 mg of magnesium takes 709–845 mg of glycinate

How much elemental magnesium is actually in 100, 200 or 400 mg of glycinate?

Magnesium glycinate is 11.8–14.1% elemental magnesium by mass (Mg(C₂H₄NO₂)₂, molar mass 172.42). Magnesium glycinate has a molar mass of 172.42 against magnesium's 24.305, so 11.8–14.1% of its mass is magnesium. One caveat: bisglycinate; chelate hydration varies by supplier, so the figures below are given as a range wherever that matters. Every 100 mg of elemental magnesium from it needs 709–845 mg of the compound, calculated 2026-10-17.

The filed salt can have more than one hydration state, so its elemental fraction is shown as a range.

bisglycinate; chelate hydration varies by supplier

Source · Chemical formula and atomic masses · Calculated 2026-08-10; powder density 0.8 g/mL, the top of the usual 0.6–0.8 range · release 2026-08-10-f441aa9f · CSV · method

Estimated salt mass versus assumed capsule capacity

3 of 25 capsule labels naming glycinate alone are above the assumed size 000 capacity at powder density 0.8 g/mL, against 8 of 137 capsule labels across the audited registry. 14 fit size 0 or 00 and 8 need size 000. This is computed with a stated assumption of powder density 0.8 g/mL, the top of the usual 0.6–0.8 range and the most favorable mass per capsule.

3 of 25 audited capsule labels are above the assumed size 000 capacity at powder density 0.8 g/mL even under the most favorable salt fraction.

A size 00 capsule holds about 730 mg of powder at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range; a size 000 about 1,100 mg.

Full label audit

Source · NIH DSLD labels; mass balance · Recognized salt only; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method

Is a label called glycinate really glycinate, or mixed with another salt?

0 of 73 labels naming glycinate also name another form as of 2026-08-10. The table counts partner names on filed labels; a named blend does not establish the elemental contribution of each salt. Naming one salt is not the same as fitting it: 3 of 25 capsule labels naming glycinate alone exceed size 000. Open the full label list to inspect individual records.

A defined molecular formula permits a calculated fraction.

All labels

Source · NIH DSLD magnesium rows · Labels naming this salt; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method

I need 200 mg of actual magnesium. What changes in compound weight and capsules between glycinate and other forms?

For 200 mg of elemental magnesium, glycinate needs 1,418–1,691 mg of compound, against oxide at 332 mg. Size 00 holds about 730 mg at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Each row uses the stated elemental fraction; hydration ambiguity stays a range, and any price comparison remains within a single salt.

Source · Chemical formulas and capsule capacity · Calculated 2026-08-10; powder density 0.8 g/mL, the top of the usual 0.6–0.8 range · release 2026-08-10-f441aa9f · CSV · method

What does glycinate cost per 100 mg of elemental magnesium, and which label is cheapest by declared elemental magnesium?

Cheapest by declared elemental magnesium among 17 ranked offers is $0.0666 per 100 mg; median $0.1889; prices observed 2026-10-26 to 2026-11-02. One offer means one ASIN and observation date; 8 observations are on review; their pack or dose has not passed the match checks. The ranked price uses the label's declared elemental amount.

17 unique offers have a ranked price per reference amount of declared elemental magnesium.

Verified: a row matched to the label by hand in August 2026 that passes every automatic check. Confirmed: brand, salt and dose match the label in the September 2026 check. Only these two are ranked; rows on review are not.

All ranked offers

Source · Amazon via licensed data provider · Unique ASIN and observation date; prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method

What else is in glycinate labels, including stearate, shells and fillers?

8 named excipients appear in the top displayed list among 73 labels naming glycinate as of 2026-08-10. A listed ingredient is a filed name, not a quantified mass; open the underlying label to check context and capsule material.

Source · NIH DSLD full label ingredient fields · Labels naming this salt; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method

What did studies measure about absorption and side effects for glycinate?

6 studies in our PubMed checked registry measured outcomes involving glycinate as of 2026-08-10. The table names each design and measured outcome, against no pooled comparison across different study methods. 2 records mention gastrointestinal or other adverse outcomes.

6 studies in this registry measured outcomes involving glycinate.

Full study registry

Source · PubMed checked study registry · Registry checked 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method

Which labels file glycinate, and how much do they declare per serving?

73 labels name glycinate; 71 have a computable elemental amount per serving, with median 210 mg, against the full list linked below. The first eight are shown here. Values are filed elemental magnesium, not an assay of the contents, in the NIH DSLD snapshot 2026-08-10.

All 73 recognized labels

Source · NIH DSLD on-market labels · Labels naming this salt; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method

Where do these numbers come from, and how do I cite or correct them?

The 73 recognized glycinate labels come from the NIH DSLD snapshot 2026-08-10. Chemistry was calculated from molecular formulas on 2026-10-17; observed retail prices are checked 2026-11-02. The linked CSV carries only values displayed on this page. Cite the release and report a claim if a filed label or calculation needs correction.

Calculation method

Source · NIH DSLD; chemical formulas; Amazon via licensed data provider · Release 2026-08-10-f441aa9f · release 2026-08-10-f441aa9f · CSV · method