Label arithmetic · NIH DSLD snapshot 2026-08-10
How much magnesium is in magnesium gluconate? 5.9% by weight, so 100 mg of magnesium takes 1,706 mg of gluconate
5.9% of magnesium gluconate is magnesium: 100 mg takes 1,706 mg of salt, 2.3 size 00 capsules. No ranked US price (Nov 2).
Magnesium gluconate is 5.9% elemental magnesium, so 100 mg of magnesium needs 1,706 mg of compound, about 2.3 size 00 capsules at 0.8 g/mL powder density. 0 of 2 capsule labels naming gluconate alone exceed size 000. A single ranked offer is $0.6164 per 100 mg of declared elemental magnesium (prices observed 2026-10-26 to 2026-11-02); one offer gives no median.
computed from chemical formula
Chart data
| Displayed chart text |
|---|
| oxide |
| 60.3% |
| hydroxide |
| 41.7% |
| carbonate |
| 24.8–28.8% |
| chloride |
| 12.0–25.5% |
| sulfate |
| 9.9–20.2% |
| citrate |
| 11.3–16.2% |
| aspartate |
| 7.5–15.6% |
| malate |
| 12.6–15.5% |
| glycinate |
| 11.8–14.1% |
| glycerophosphate |
| 12.5% |
| lactate |
| 10.2–12.0% |
| taurate |
| 8.9% |
| L-threonate |
| 8.3% |
| orotate |
| 7.3% |
| gluconate |
| 5.9% |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Recompute for your bottle
Enter your container price, declared elemental amount and servings to calculate a price per 100 mg for this bottle.
Same-salt comparison appears here.
How much elemental magnesium is actually in 100, 200 or 400 mg of gluconate?
Magnesium gluconate is 5.9% elemental magnesium by mass (Mg(C₆H₁₁O₇)₂, molar mass 414.6). Magnesium gluconate has a molar mass of 414.6 against magnesium's 24.305, so 5.9% of its mass is magnesium. Every 100 mg of elemental magnesium from it needs 1,706 mg of the compound, calculated 2026-10-17.
computedThis defined salt has one calculated elemental fraction from its formula.
Chart data
| Displayed chart text |
|---|
| gluconate |
| 6,826 |
| oxide |
| 663 |
| Elemental magnesium | gluconate required | Size 00 capsules that much powder fills |
|---|---|---|
| 100 mg | 1,706 mg | 3 size 00 capsules (2.3 capsules' worth of powder) |
| 200 mg | 3,413 mg | 5 size 00 capsules (4.7 capsules' worth of powder) |
| 400 mg | 6,826 mg | 10 size 00 capsules (9.4 capsules' worth of powder) |
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
0 of 2 capsule labels naming gluconate 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. 2 fit size 0 or 00 and 0 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.
computed with assumption2 capsule labels naming gluconate alone can be checked against capsule sizes.
Chart data
| Displayed chart text |
|---|
| gluconate |
| fits 2 of 2 |
| needs 000 0 of 2 |
| exceeds 0 of 2 |
| all audited |
| fits 82 of 137 |
| needs 000 47 of 137 |
| exceeds 8 of 137 |
| Mass budget verdict | Labels |
|---|---|
| Fits size 0 or 00 | 2 of 2 |
| Needs size 000 | 0 of 2 |
| Exceeds size 000 | 0 of 2 |
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.
Source · NIH DSLD labels; mass balance · Recognized salt only; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is a label called gluconate really gluconate, or mixed with another salt?
0 of 6 labels naming gluconate 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: 0 of 2 capsule labels naming gluconate alone exceed size 000. Open the full label list to inspect individual records.
measuredA defined molecular formula permits a calculated fraction.
| Other named form | Labels |
|---|---|
| No other named form | 6 labels reviewed |
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 gluconate and other forms?
For 200 mg of elemental magnesium, gluconate needs 3,413 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.
computed with assumption| Salt | Elemental fraction | Compound for 200 mg | Size 00 capsules |
|---|---|---|---|
| Magnesium gluconate | 5.9% | 3,413 mg | 5 size 00 |
| Magnesium glycinate | 11.8–14.1% | 1,418–1,691 mg | 2–3 size 00 |
| Magnesium citrate | 11.3–16.2% | 1,238–1,770 mg | 2–3 size 00 |
| Magnesium oxide | 60.3% | 332 mg | 1 size 00 |
| Magnesium malate | 12.6–15.5% | 1,287–1,584 mg | 2–3 size 00 |
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 gluconate cost per 100 mg of elemental magnesium, and which label is cheapest by declared elemental magnesium?
A single ranked offer is $0.6164 per 100 mg of declared elemental magnesium (prices observed 2026-10-26 to 2026-11-02); one offer gives no median. One offer means one ASIN and observation date; No observed price is on review. The ranked price uses the label's declared elemental amount.
computedFewer than three offers are ranked, so no distribution band is shown.
Chart data
| Displayed chart text |
|---|
| n=1 |
| median $0.6164 |
| Rank | Label | EC100 | Match and observation |
|---|---|---|---|
| 1 | Freeda Magnesium Gluconate | $0.6164 per 100 mg | confirmed; 2026-11-02 · $16.95 for 100 units |
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.
single offer
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 gluconate labels, including stearate, shells and fillers?
4 named excipients appear in the top displayed list among 6 labels naming gluconate 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.
measured
Chart data
| Displayed chart text |
|---|
| cellulose |
| 2 |
| croscarmellose sodium |
| silicon dioxide |
| glycerin |
| 1 |
| Filed ingredient | Labels |
|---|---|
| cellulose | 2 of 6 |
| croscarmellose sodium | 2 of 6 |
| silicon dioxide | 2 of 6 |
| glycerin | 1 of 6 |
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 gluconate?
2 studies in our PubMed checked registry measured outcomes involving gluconate as of 2026-08-10. The table names each design and measured outcome, against no pooled comparison across different study methods. No study in our registry of 16 measured side effects for gluconate as of 2026-08-10.
measured2 studies in this registry measured outcomes involving gluconate.
| Year | Study design and measured outcome | PubMed |
|---|---|---|
| 2005 | Eighty male Wistar rats fed a magnesium-depleted diet for three weeks, then randomised into ten groups, each receiving a different magnesium salt labelled with a stable isotope. Stable isotopes allow absorption and retention to be traced directly rather than inferred from urine, across ten salts at once , the widest head-to-head comparison in the literature. | PMID 16548135 |
| 1992 | Randomized, crossover study in 12 healthy normomagnesemic subjects: a baseline period followed by three separate one-week supplementation trials at 16 mmol/dose , magnesium chloride solution, slow-release magnesium chloride tablets, and magnesium gluconate tablets , with a standardized diet during each trial. Urinary magnesium excretion in 0-4, 4-8, 8-12, and 12-24 hour collections; intraleukocyte, total serum, and ultrafiltrable serum magnesium at 0, 1, 2, 3, 4, 8, 12, and 24 hours; area-under-curve for each compartment relative to baseline for each supplement form. | PMID 1468087 |
Source · PubMed checked study registry · Registry checked 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels file gluconate, and how much do they declare per serving?
6 labels name gluconate; 6 have a computable elemental amount per serving, with median 80 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.
measured
Chart data
| Displayed chart text |
|---|
| P10 14 mg |
| P50 80 mg |
| P90 110 mg |
| Label | Declared elemental per serving | NIH DSLD |
|---|---|---|
| BulkSupplements.com Magnesium Gluconate 500 mg | 80 mg | 294869 |
| BulkSupplements.com Magnesium Gluconate 500 mg | 80 mg | 294870 |
| Freeda Magnesium Gluconate | 110 mg | 246217 |
| Freeda Magnesium Gluconate | 110 mg | 246221 |
| PureBulk.com Magnesium Gluconate | 27 mg | 23164 |
| Vinco Ionic Magnesium | 1 mg | 206463 |
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 6 recognized gluconate 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.
computed| Layer | Source and date |
|---|---|
| Labels | NIH DSLD snapshot 2026-08-10 |
| Chemistry | Formula calculation 2026-10-17 |
| Retail | Prices observed 2026-10-26 to 2026-11-02 |
Source · NIH DSLD; chemical formulas; Amazon via licensed data provider · Release 2026-08-10-f441aa9f · release 2026-08-10-f441aa9f · CSV · method