Magnesium glycinate vs L-threonate: serving amounts and GB label rules
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Magnesium glycinate and magnesium L-threonate are different magnesium compounds. Before choosing between them, compare the elemental magnesium in the complete daily serving. For L-threonate, there is also a specific Great Britain authorisation to understand.
Old advice that magnesium L-threonate has not been authorised in Great Britain is now out of date. However, authorisation is not an endorsement of every product using the name, or proof that it outperforms glycinate.
What changed in Great Britain in 2026?
The Food Standards Agency's magnesium L-threonate monohydrate register entry records an authorised status dated 5 March 2026. The entry applies in England, Scotland and Wales.
Its conditions cover food supplements for people aged 18 or above, excluding pregnant and lactating women. The maximum level is stated as 250 mg magnesium per day. The required label designation is "Magnesium L-threonate", with a statement that the supplement should not be consumed by people under 18, pregnant women or lactating women.
That 250 mg figure concerns magnesium, not 250 mg of the whole L-threonate compound. It is an authorisation condition, not a suggested personal dose or a general limit for every magnesium form.
The entry also names AIDP Inc. and protects the underlying proprietary data for five years from the authorisation coming into force. It allows specified routes for another applicant or supply with agreement. The register therefore should not be read as blanket approval for any unnamed source. Northern Ireland is outside the territorial scope of this GB entry.
Compare two actual daily servings
These declarations were checked on 7 November 2026:
| Label detail | Hyoomen Magnesium Glycinate | Cytoplan Magtein Magnesium L-Threonate |
|---|---|---|
| Complete daily serving | Three capsules | Three capsules |
| Declared compound amount | Approximately 1,850 mg magnesium glycinate | 2,000 mg Magtein magnesium L-threonate |
| Elemental magnesium | 225 mg | 144 mg |
Hyoomen's amounts come from its Magnesium Glycinate product page. The named L-threonate example comes from Cytoplan's manufacturer page. It is one product example, not a description of all L-threonate supplements.
The larger compound number belongs to the L-threonate example, while the larger elemental amount belongs to Hyoomen. Neither observation tells you which product will produce a better health outcome. They show why the two sorts of milligram figure must stay separate.
Authorisation and benefit claims answer different questions
A novel-food authorisation sets conditions for placing an ingredient on the market. It does not, by itself, substantiate a promise about memory, sleep or a comparison with another form.
Likewise, a product page discussing the brain does not turn a nutrition-panel comparison into a clinical trial. This guide uses the comparator's ingredient and serving declarations, not its absorption or cognitive-benefit marketing.
Do not change either product's directions to make the elemental numbers match. A comparison is more useful when it records what each actual labelled serving contains, rather than inventing a new serving for one of them.
Make the choice on a complete, current label
For an L-threonate purchase in Great Britain, check the named ingredient, elemental amount, full daily direction and required warning. Do not rely on an older article about EU authorisation or a label intended for a different market as confirmation of the GB conditions.
For glycinate, use the same serving and ingredient checks without importing the L-threonate authorisation conditions into a different product. Hyoomen supplies a single magnesium source in a resealable doypack pouch, with 90 capsules and a three-capsule daily direction. Its magnesium capsules guide covers the broader label questions.
If that is the formula you want to consider, review Hyoomen's current ingredients, directions and cautions. Neither a specialist-sounding name nor a larger number replaces that check.
General information, not clinical advice. Follow the product label and seek professional advice about medicines or medical circumstances. Supplements do not replace a varied, balanced diet and a healthy lifestyle.