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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.

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

Thyroid and Fertility and Immunity

1244 capsules across 38 ingredients

Thyroid. Only iodine and selenium hold authorised register wording about the thyroid, quoted exactly on their pages. Thyroid conditions are diagnosed and managed by a GP, and the British Thyroid Foundation is the specialist charity.

Fertility. Ingredients here hold register claims relating to fertility and reproduction, quoted exactly. UK guidance on folic acid before and during early pregnancy is the best-established nutritional advice in this area, and Fertility Network UK below offers wider support.

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 · 68 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 68 vitamin c capsules

Vitamin D

2 authorised claims · 60 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

Not authorised for thyroid: the register refused 1 claim there.

All 60 vitamin d capsules

Zinc

2 authorised claims · 53 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity
  • “Zinc contributes to normal fertility and reproduction” · Fertility

Not authorised for thyroid: the register refused 1 claim there.

All 53 zinc capsules

Vitamin B6

1 authorised claim · 44 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity

All 44 vitamin b6 capsules

Vitamin B12

1 authorised claim · 34 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity

All 34 vitamin b12 capsules

Folate

2 authorised claims · 30 capsules · ingredient page
  • “Folate contributes to the normal function of the immune system” · Immunity
  • “Folate contributes to maternal tissue growth during pregnancy” · Fertility

All 30 folate capsules

Iron

1 authorised claim · 17 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity

All 17 iron capsules

Selenium

3 authorised claims · 16 capsules · ingredient page
  • “Selenium contributes to the normal function of the immune system” · Immunity
  • “Selenium contributes to normal spermatogenesis” · Fertility
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 16 selenium capsules

Copper

1 authorised claim · 13 capsules · ingredient page
  • “Copper contributes to the normal function of the immune system” · Immunity

All 13 copper capsules

Vitamin A

1 authorised claim · 9 capsules · ingredient page
  • “Vitamin A contributes to the normal function of the immune system” · Immunity

All 9 vitamin a capsules

Iodine

1 authorised claim · 8 capsules · ingredient page
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 8 iodine capsules

Assessed by the register and not authorised

The register looked at claims for these relating to thyroid and fertility 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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