| NRV | 375 mg |
|---|---|
| 15% NRV (minimum for most claims) | 56.2 mg |
| Example ingredient form | magnesium citrate or magnesium oxide |
| Authorised claims (examples) | 7 |
Showing Magnesium in the nutrient table
Give the amount of Magnesium per daily dose, in mg, and the %NRV. A daily dose of 200 mg works out as 200 ÷ 375 × 100 = 53% NRV. Check other doses with our %NRV calculator.
The nutrient table names the nutrient. The ingredients list names the form used, such as magnesium citrate.
Is there a maximum dose?
The UK has no legal maximum for magnesium in food supplements. The Department of Health and Social Care advice, published on the NHS website, is: 400 mg or less a day from supplements is unlikely to cause harm.
Authorised health claims
These are examples of authorised claims on the GB nutrition and health claims register. Use them word for word or with wording that means exactly the same, and only when the daily dose provides at least 15% of the NRV (56.2 mg).
- “Magnesium contributes to a reduction of tiredness and fatigue”
- “Magnesium contributes to electrolyte balance”
- “Magnesium contributes to normal energy-yielding metabolism”
- “Magnesium contributes to normal functioning of the nervous system”
- “Magnesium contributes to normal muscle function”
- “Magnesium contributes to normal psychological function”
- “Magnesium contributes to the maintenance of normal bones”
Check the full register entry before you print: some claims have extra conditions. See our health claims guide and how to check a claim on the register.
Labelling notes
Magnesium is the nutrient most often mislabelled. 500 mg of magnesium citrate contains roughly 80 mg of magnesium, not 500 mg. Always use the elemental magnesium figure.
Check before you print. Claims and dose advice are summarised from the GB nutrition and health claims register and the NHS vitamins and minerals pages, as of October 2026. Confirm your final wording against the register.