Vitamin D supplement labels: UK buying dossier
Keep D2 or D3 identity and microgram or IU units attached to the pack’s stated portion. Do not turn the comparison into personal dose advice.
Compare vitamin form, units, format and warning context
Keep D2 or D3 identity and microgram or IU units attached to the pack’s stated portion. Do not turn the comparison into personal dose advice.
Vitamin D form
01Compare: Record vitamin D2, vitamin D3 or the exact form only when the current label specifies it.
Why it matters: Shared “vitamin D” wording does not prove products are otherwise equivalent.
Evidence check: Use the ingredients and nutrient panel, not a retailer filter.
Units and stated portion
02Compare: Align micrograms or IU transparently and compare on the same per-unit or stated daily-portion basis.
Why it matters: Different units and portion definitions can make a number misleading.
Evidence check: Retain original units and show any conversion rather than comparing headline numerals.
Tablet, capsule, spray or liquid
03Compare: Compare format, number of units per stated portion, carrier ingredients and allergens.
Why it matters: Convenience and ingredient profile differ across formats.
Evidence check: Choose the format before comparing pack count or price.
Directions, warnings and claims
04Compare: Read maker directions, current warnings and exact authorised claim wording with its conditions.
Why it matters: A permitted nutrient claim does not decide individual need or use.
Evidence check: Take personal deficiency, medicine or dose questions to a pharmacist or clinician.
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 Compare D2 or D3 where stated, units, format, allergens and pack directions without inferring a personal dose.
- 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.