# The Food Supplements Purity Criteria (Magnesium L-threonate monohydrate) (England) Regulations 2026

Draft 2026, ISBN 9780348282573

These Regulations set the purity criteria for the mineral substance magnesium L-threonate monohydrate, as a source of magnesium, as set out in the Schedule to these Regulations (regulation 2).

PDFs: Printed copy https://openlegislation.uk/draft-food-supplements-purity-criteria-magnesium-l-threonate-monohydrate-england-regulations-2026/pdf/ukdsi_9780348282573_en.pdf; UK Explanatory Memorandum https://openlegislation.uk/draft-food-supplements-purity-criteria-magnesium-l-threonate-monohydrate-england-regulations-2026/pdf/ukdsiem_9780348282573_en_001.pdf

## Introductory text

Draft Regulations laid before Parliament under regulation 6(3) of the Nutrition (Amendment etc.) (EU Exit) Regulations 2019, for approval by resolution of each House of Parliament.
FOOD, ENGLAND
Made ***
Coming into force 13th August 2026
The Secretary of State makes these Regulations in exercise of the powers conferred by regulation 3 and in accordance with regulation 5(1) of the Nutrition (Amendment etc.) (EU Exit) Regulations 2019 (“the 2019 Regulations”).
There has been open and transparent consultation in accordance with Article 9 of Regulation (EC) No 178/2002 of the European Parliament and of the Council of 28 January 2002 laying down the general principles and requirements of food law, establishing the European Food Safety Authority and laying down procedures in matters of food safety.
In accordance with regulation 6(3) of the 2019 Regulations, a draft of this instrument has been laid before Parliament and approved by a resolution of each House of Parliament.

## 1 Citation, commencement, extent and application

(1) These Regulations may be cited as the Food Supplements Purity Criteria (Magnesium L-threonate monohydrate) (England) Regulations 2026 and come into force on 13th August 2026.
(2) These Regulations extend to England and Wales.
(3) These Regulations apply to England only.

## 2 Purity criteria for magnesium L-threonate monohydrate

The purity criteria for magnesium L-threonate monohydrate are set out in the Schedule to these Regulations.

## Signature

Signed by authority of the Secretary of State for Health and Social Care
L.S.
Name
Parliamentary Under-Secretary of State
Department of Health and Social Care
Date

## PURITY CRITERIA FOR MAGNESIUM L-THREONATE MONOHYDRATE

Synonym
Magnesium L-threonate
Definition
Chemical name
Magnesium (2R,3S)-2,3,4-trihydroxybutanoate monohydrate
CAS number
500304-76-7
Chemical formula
C 8H 16MgO 11
Molecular weight
312.51 Da
Colour (solid)
White
Assay
Magnesium: 7.2% to 8.3%
L-threonate: 82% to 91%
Description
A water-soluble white powder which is manufactured via a chemical synthetic process.
Identification
Solubility
Soluble in water at 1% concentration at 25℃ and that is clear in solution at 1% concentration.
pH USP (1% in H₂O)
5.8 to 7.0
Purity
Loss on drying
Not more than 5.0% (105℃/4 hours)
Oxalic acid/oxalate
Not more than 0.5% (as oxalic acid)
Arsenic
Not more than 1 ppm
Lead
Not more than 0.5 ppm
Cadmium
Not more than 0.2 ppm
Mercury
Not more than 0.1 ppm

## Explanatory note

(This note is not part of the Regulations)
These Regulations set the purity criteria for the mineral substance magnesium L-threonate monohydrate, as a source of magnesium, as set out in the Schedule to these Regulations (regulation 2).
An impact assessment has not been produced for this instrument as no, or no significant, impact on the private, voluntary or public sector is foreseen.
An Explanatory Memorandum has been published alongside this instrument at www.legislation.gov.uk.

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Source: https://www.legislation.gov.uk/ukdsi/2026/9780348282573 (the official version)
Page: https://openlegislation.uk/draft-food-supplements-purity-criteria-magnesium-l-threonate-monohydrate-england-regulations-2026
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.