The 98% specification and the percentage of elemental magnesium describe different properties and should not be presented as if they were the same test result.
Compound Identity and Purity
A 98% claim may refer to the identity or purity of magnesium glycinate powder, but the page should state the exact analytical method, calculation basis and acceptance range used for this value.
Elemental Magnesium Content
Magnesium glycinate (C₄H₈MgN₂O₄; molecular weight: 172.42 g/mol) contains a theoretical elemental magnesium content of approximately 14.1% by weight. Therefore, the COA specification of Assay (Mg) ≥14.0% and the reported result of 14.10% refer to the elemental magnesium content rather than the total weight of magnesium glycinate, and are in line with the theoretical value.
Finished-Product Calculation
Formulators should calculate raw-material input from the confirmed elemental magnesium percentage, not from the 98% figure. For example, if a batch contains 14.0% elemental magnesium, approximately 714 mg of raw material supplies 100 mg of elemental magnesium before manufacturing tolerances and overages are considered.
Specification Alignment
The quotation, product specification, sample COA and bulk-batch COA should clearly distinguish compound purity from elemental magnesium.