Magnesium forms and labels: UK buying dossier
Magnesium citrate, oxide, glycinate and other compounds are not directly comparable by compound weight or marketing shorthand alone.
Separate the magnesium compound from labelled elemental magnesium
Magnesium citrate, oxide, glycinate and other compounds are not directly comparable by compound weight or marketing shorthand alone.
Named magnesium compound
01Compare: Record the exact compound or compounds listed, such as citrate, oxide or bisglycinate where stated.
Why it matters: “Magnesium” on the front does not identify the ingredient form or a blend’s proportions.
Evidence check: Use the current ingredients list and mark undisclosed blend composition as unknown.
Labelled elemental magnesium
02Compare: Find the amount explicitly labelled as magnesium rather than assuming the compound mass is the nutrient amount.
Why it matters: Compound weight and elemental magnesium are different comparison bases.
Evidence check: Compare the declared magnesium amount, unit and nutrient reference value information on the same stated portion.
Portion and format basis
03Compare: Compare tablets, capsules, powders and liquids by units per stated portion and pack directions.
Why it matters: A high unit count or scoop mass can disguise an inconvenient or unlike serving basis.
Evidence check: Record units per portion, amount per portion and total stated portions together.
Other ingredients and warnings
04Compare: Compare capsule materials, flavours, sweeteners, other nutrients and all current warnings.
Why it matters: A “magnesium complex” can add ingredients and claim language unrelated to the buyer’s core requirement.
Evidence check: Use the exact variant label and qualified advice for personal health or medicine questions.
Three checks before checkout
Enough detail to make the choice better informed and clearer, without turning a quick buying decision into a compliance manual.
- 1 Identify the named compound, labelled elemental amount where provided, format, other ingredients and warnings.
- 2 Match the exact flavour, variant, pack and formula rather than a similar marketplace image.
- 3 Use the current physical label for ingredients, allergens, warnings and stated serving information.
Take the next useful step
Continue to the closest practical comparison or official source.
Why these checks matter in the UK
Compare the food label, ingredients, amount per stated serving, warnings and allergens; do not use the page as medical advice.
Food supplements are regulated as foods rather than medicines.
Great Britain · current
Treat a claim as a constrained label statement, not proof that the product will deliver the outcome for a particular person.
Nutrition and health claims used in Great Britain need an authorised basis and must meet the exact conditions of use.
Great Britain · current
Check the market named on the label and use the matching official source rather than assuming one UK-wide claims register.
Some food-supplement and claims rules differ between Great Britain and Northern Ireland.
Great Britain, Northern Ireland · current
Sources and review boundaries
- Department of Health and Social Care: Food supplements guidance — reviewed 2026-08-03; Food-supplement rules differ between Great Britain and Northern Ireland in some areas.
- Department of Health and Social Care: Great Britain nutrition and health claims register — reviewed 2026-08-03; A listed claim remains subject to its exact conditions of use and the product label.