---
title: "The Food Supplements Purity Criteria (Magnesium L-threonate monohydrate) (England) Regulations 2026"
id: 9e8e06e6-ef17-48ae-8080-afdb59450f02
authority: uk
place: "United Kingdom"
applies_also_from: []
kind: regulation
in_force: true
publisher_url: https://www.legislation.gov.uk/uksi/2026/680
attribution: "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
solon_url: https://solon.orangecat.ch/law/9e8e06e6-ef17-48ae-8080-afdb59450f02
language: en
in_force_from: 2026-08-13
date_basis: publisher
status: consolidated
source_url: https://www.legislation.gov.uk/uksi/2026/680/data.xml
read_on: 2026-11-10
sha256: f6e29d41a465222c4ff61632f29697e15ed0872a41610bf64536a8f1ef59d75f
provisions: 4
---

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

## Title and introductory text {#prelims}

2026 No. 680
FOOD, ENGLAND
The Food Supplements Purity Criteria (Magnesium L-threonate monohydrate) (England) Regulations 2026
Made
22nd June 2026
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 {#regulation-1}

(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 {#regulation-2}

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

## Schedule PURITY CRITERIA FOR MAGNESIUM L-THREONATE MONOHYDRATE {#schedule}

Regulation 2
Synonym | Magnesium L-threonate
Definition
Chemical name | Magnesium (2R,3S)-2,3,4-trihydroxybutanoate monohydrate
CAS number | 500304-76-7
Chemical formula | C8H16MgO 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