Updated 28 September 2026: label arithmetic is not a chelation or ingredient-identity test.
Enter the ingredient weight and elemental magnesium from the same labelled serving. This calculator shows the ratio and compares it with theoretical values. It does not identify ingredients, prove chelation, or measure absorption.
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Enter both numbers
Magnesium content of common forms
| Form | Magnesium by weight | Note |
|---|
How this is calculated. Elemental magnesium divided by ingredient weight, multiplied by 100, gives the ratio. Pure anhydrous magnesium bisglycinate is approximately 14.1% magnesium by weight (24.305 ÷ 172.42). Hydration changes that basis. A materially higher ratio is inconsistent with pure anhydrous bisglycinate if the declarations are accurate and comparable, but does not identify an extra source. A compatible result does not prove identity or rule out mixtures. The display uses a 0.15 percentage-point allowance for label rounding, not a validated laboratory uncertainty estimate.
Measured total magnesium is different from measured chelation. The published 14.01% result is for a submitted raw-material lot. Neither the total assay nor the sample name proves full chelation or finished-capsule potency. Read the reports and limitations. Source splits are not inferred by this calculator.