US magnesium labels · snapshot 2026-08-10
Across 716 magnesium product labels and 16 named forms in the NIH DSLD snapshot of 2026-08-10, 53 of 200 auditable capsule labels require more compound per capsule than the 1,100 mg size 000 model allows, even at the smallest compound mass permitted by the assigned salt.
8 research sections connect filed labels, chemistry and source records as of 2026-09-13; section counts follow the published data.
What we add to the registry
For 419 labels with an assigned single salt in the 2026-08-10 snapshot, chemistry connects elemental milligrams to compound mass; 74 product labels also have a screened price match from the 2026-08-10 price snapshot.
In the 2026-08-10 audit, 53 capsule labels exceed 1,100 mg of modeled compound fill per unit. Compound mass = elemental mg ÷ magnesium fraction; mass per capsule = compound mass ÷ capsules per serving.
The comparison uses powder density 0.6–0.8 g/mL. Other ingredients also occupy space; the calculation assigns the entire modeled fill to the magnesium compound.
Inspect the labels and working →For 100 mg elemental magnesium, the chemistry accompanying the 2026-08-10 snapshot gives 166 mg oxide and 709–845 mg glycinate. Their magnesium fractions are 60.32% and 11.83–14.10% by mass.
Water associated with a compound changes its magnesium fraction. The interval remains visible from the fraction through to the required mass.
Read all 15 salt calculations →For the 74 screened price matches in the 2026-08-10 snapshot, EC100 = price ÷ (elemental mg per serving × servings ÷ 100). The denominator is declared elemental magnesium in the container.
Price comparisons stay within one salt. A smaller compound mass changes packing requirements; EC100 alone does not describe that difference.
Calculate a container →Fixed chemistry · snapshot context 2026-08-10
The 15 formulas below convert 100 mg of elemental magnesium into compound mass using the site's chemistry constants, shown alongside the 2026-08-10 registry snapshot. Fractions are percentages by mass; compound milligrams are rounded to the nearest whole milligram.
| Salt | Elemental Mg by mass | Compound mg per 100 mg Mg | Calculation and interpretation |
|---|---|---|---|
| Magnesium oxide | 60.32% | 166 mg | For 100 mg elemental magnesium, magnesium oxide requires 166 mg of compound at 60.32% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses MgO, with a formula molar mass of 40.30 g/mol. |
| Magnesium hydroxide | 41.68% | 240 mg | For 100 mg elemental magnesium, magnesium hydroxide requires 240 mg of compound at 41.68% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(OH)₂, with a formula molar mass of 58.32 g/mol. |
| Magnesium carbonate | 24.78–28.83% | 347–404 mg | For 100 mg elemental magnesium, magnesium carbonate requires 347–404 mg of compound at 24.78–28.83% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The range reflects anhydrous or hydrated; labels rarely state which. |
| Magnesium chloride | 11.96–25.53% | 392–836 mg | For 100 mg elemental magnesium, magnesium chloride requires 392–836 mg of compound at 11.96–25.53% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The range reflects anhydrous 25.5%, hexahydrate 12.0%. |
| Magnesium sulfate | 9.86–20.19% | 495–1,014 mg | For 100 mg elemental magnesium, magnesium sulfate requires 495–1,014 mg of compound at 9.86–20.19% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The range reflects anhydrous 20.2%, heptahydrate 9.9%. |
| Magnesium citrate | 11.30–16.16% | 619–885 mg | For 100 mg elemental magnesium, magnesium citrate requires 619–885 mg of compound at 11.30–16.16% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The range reflects trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%. |
| Magnesium malate | 13.20–15.54% | 644–758 mg | For 100 mg elemental magnesium, magnesium malate requires 644–758 mg of compound at 13.20–15.54% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The range reflects anhydrous or dihydrate. |
| Magnesium glycinate | 11.83–14.10% | 709–845 mg | For 100 mg elemental magnesium, magnesium glycinate requires 709–845 mg of compound at 11.83–14.10% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The range reflects bisglycinate; chelate hydration varies by supplier. |
| Magnesium glycerophosphate | 12.50% | 800 mg | For 100 mg elemental magnesium, magnesium glycerophosphate requires 800 mg of compound at 12.50% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses MgC₃H₇O₆P, with a formula molar mass of 194.36 g/mol. |
| Magnesium lactate | 12.01% | 833 mg | For 100 mg elemental magnesium, magnesium lactate requires 833 mg of compound at 12.01% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(C₃H₅O₃)₂, with a formula molar mass of 202.45 g/mol. |
| Magnesium taurate | 8.85% | 1,130 mg | For 100 mg elemental magnesium, magnesium taurate requires 1,130 mg of compound at 8.85% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(C₂H₆NO₃S)₂, with a formula molar mass of 274.58 g/mol. |
| Magnesium aspartate | 8.42% | 1,188 mg | For 100 mg elemental magnesium, magnesium aspartate requires 1,188 mg of compound at 8.42% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(C₄H₆NO₄)₂, with a formula molar mass of 288.50 g/mol. |
| Magnesium L-threonate | 8.25% | 1,212 mg | For 100 mg elemental magnesium, magnesium l-threonate requires 1,212 mg of compound at 8.25% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(C₄H₇O₅)₂, with a formula molar mass of 294.50 g/mol. |
| Magnesium orotate | 7.27% | 1,376 mg | For 100 mg elemental magnesium, magnesium orotate requires 1,376 mg of compound at 7.27% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(C₅H₃N₂O₄)₂, with a formula molar mass of 334.49 g/mol. |
| Magnesium gluconate | 5.86% | 1,706 mg | For 100 mg elemental magnesium, magnesium gluconate requires 1,706 mg of compound at 5.86% magnesium by mass in the chemistry table accompanying the 2026-08-10 snapshot. The calculation uses Mg(C₆H₁₁O₇)₂, with a formula molar mass of 414.60 g/mol. |
The formula supplies the fraction: magnesium atoms per formula unit × 24.305 ÷ formula molar mass. A 100 mg elemental amount is a common arithmetic unit here. These compound masses describe the magnesium carrier before other ingredients or the capsule shell.
Corpus findings
Of 200 capsule labels with a computable mass budget in the 2026-08-10 snapshot, 81 fit the size 0/00 model, 66 require size 000, and 53 exceed the size 000 model, using each salt's highest magnesium fraction.
| Outcome | Labels | Smallest compound mass per capsule |
|---|---|---|
| Fits size 0 or 00 | 81 | At most 730 mg |
| Requires size 000 | 66 | Above 730 mg and at most 1,100 mg |
| Exceeds size 000 | 53 | Above 1,100 mg |
A result above capacity identifies a conflict between the assigned single salt, declared elemental amount, serving-unit count and modeled fill. A hydrated reading can increase the required mass. The audit register exposes the product records behind the count so the source declaration can be inspected.
Dated gaps
As of the 2026-08-10 registry snapshot, 297 of 716 product labels have no single resolved salt in our layer; as of the 2026-08-10 price snapshot, 642 have no matched price observation.
Follow the evidence
The 2026-08-10 collection connects 716 product records, 273 brands and 16 form groups; each index provides a different route into the same declared fields.
Search the 716 product records in the 2026-08-10 snapshot by brand or product identity, then inspect the elemental amount, serving count and salt assignment.
Product index →Open one of 273 brand groups from 2026-08-10 to see which salts appear across its labels and how its capsule mass budgets distribute.
Brand index →The 16 form groups in the 2026-08-10 corpus connect label counts to the salt calculation. The magnesium hub provides the complete collection abstract.
Form index →The linked literature collection contains 16 studies from 1990–2026. Read what each study measured with its population, endpoint and limits, or download the label-price data to reproduce the arithmetic.