#2026/680Purity criteria set for magnesium L-threonate monohydrate in food supplements in England
AI-generated summary for informational purposes only. Not legal advice. See the original source for the authoritative text.
This law sets the required purity standards for magnesium L-threonate monohydrate when it is used as a source of magnesium in food supplements sold in England. It defines the substance, its chemical identity, expected appearance, assay ranges, solubility, pH, and limits for contaminants such as arsenic, lead, cadmium, mercury, and oxalate. Food supplement manufacturers, importers, and quality teams will need to check that any magnesium L-threonate monohydrate used in products meets these specifications from 13 August 2026. The measure is technical and product-specific, with no significant wider impact expected.
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Key Changes
- Sets official purity criteria for magnesium L-threonate monohydrate used as a magnesium source in food supplements in England
- Defines required assay ranges for magnesium and L-threonate, plus identification requirements such as solubility and pH
- Introduces maximum limits for contaminants including oxalate, arsenic, lead, cadmium, and mercury
Obligations
What this law requires
Ensure magnesium L-threonate monohydrate used as a source of magnesium in food supplements placed on the market in England meets the purity criteria set out in the Regulations.
Verify that magnesium L-threonate monohydrate is the specified substance: magnesium (2R,3S)-2,3,4-trihydroxybutanoate monohydrate, CAS number 500304-76-7, chemical formula C8H16MgO11, molecular weight 312.51 Da.
Ensure the substance is a water-soluble white powder, soluble in water at 1% concentration at 25℃, and clear in solution at 1% concentration.
Ensure assay results for magnesium L-threonate monohydrate are within the specified ranges: magnesium 7.2% to 8.3% and L-threonate 82% to 91%.
Ensure the pH of magnesium L-threonate monohydrate tested under USP conditions at 1% in water is between 5.8 and 7.0.