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BestCapsules

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Say what you want help with. The finder shows what the GB register lets any seller claim for it, what the register assessed and refused, and the cheapest capsules per capsule for each ingredient. It quotes; it never advises.

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Where the register allows less than sellers suggest

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Name it and the finder says whether the register authorises any claim for it for your goals, or refused one, or has never assessed it.

  • None yet. Type an ingredient in the box above, for example “magnesium” or “turmeric”.

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Seller-stated only: vegan means the seller says vegan.

Blood sugar and Immunity

517 capsules across 35 ingredients

Blood sugar. A small number of ingredients hold authorised register wording about normal blood glucose levels, quoted exactly on their pages; a much larger number of claims about blood sugar were assessed and refused. Nothing here is about treating or preventing diabetes, and anyone managing blood glucose should follow their care team's advice. Diabetes UK is the specialist charity.

Immunity. This page gathers ingredients whose GB register claims relate to the normal function of the immune system, with the exact authorised wording quoted on each ingredient page. Anything not authorised may not be claimed by sellers, and we quote that status too. A balanced diet, sleep and vaccination advice from the NHS come before any capsule.

Nothing here is medical advice. The wording is the GB register's, quoted exactly; whether a product qualifies to use it is the seller's responsibility. Speak to a GP or pharmacist before taking a supplement, especially if you are pregnant, take medicines or have a diagnosed condition. Wording from the GB nutrition and health claims register; mapping reviewed 4 September 2026.

Holds an authorised claim

Vitamin C

2 authorised claims · 106 capsules · ingredient page
  • “Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise” · Immunity
  • “Vitamin C contributes to the normal function of the immune system” · Immunity

All 106 vitamin c capsules

Vitamin D

2 authorised claims · 76 capsules · ingredient page
  • “Vitamin D contributes to the normal function of the immune system” · Immunity
  • “Vitamin D contributes to the normal function of the immune system in children.” · Immunity

All 76 vitamin d capsules

Zinc

1 authorised claim · 71 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity

All 71 zinc capsules

Vitamin B6

1 authorised claim · 62 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity

All 62 vitamin b6 capsules

Folate

1 authorised claim · 57 capsules · ingredient page
  • “Folate contributes to the normal function of the immune system” · Immunity

All 57 folate capsules

Vitamin B12

1 authorised claim · 51 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity

All 51 vitamin b12 capsules

Selenium

1 authorised claim · 28 capsules · ingredient page
  • “Selenium contributes to the normal function of the immune system” · Immunity

All 28 selenium capsules

Iron

1 authorised claim · 19 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity

All 19 iron capsules

Chromium

1 authorised claim · 18 capsules · ingredient page
  • “Chromium contributes to the maintenance of normal blood glucose levels” · Blood sugar

All 18 chromium capsules

Vitamin A

1 authorised claim · 18 capsules · ingredient page
  • “Vitamin A contributes to the normal function of the immune system” · Immunity

All 18 vitamin a capsules

Copper

1 authorised claim · 10 capsules · ingredient page
  • “Copper contributes to the normal function of the immune system” · Immunity

Not authorised for blood sugar: the register refused 1 claim there.

All 10 copper capsules

Assessed by the register and not authorised

The register looked at claims for these relating to blood sugar and immunity and turned them down. Sellers may not make them. Prices are shown for ingredients you named; the rest link to their register page.

Support & information

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