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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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Testosterone and Thyroid and Immunity and Weight

1386 capsules across 51 ingredients

Testosterone. Only a small number of ingredients hold register claims mentioning testosterone, and this page quotes them exactly. Claims in this category are heavily marketed well beyond what the register authorises; the split below shows the line.

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.

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.

Weight. The register takes a strict line on weight claims, and very little is authorised. This page shows the real status of ingredients people discuss for weight, quoted exactly. The NHS Better Health programme below is the evidence-based starting point.

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 · 238 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 238 vitamin c capsules

Zinc

2 authorised claims · 185 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity
  • “Zinc contributes to the maintenance of normal testosterone levels in the blood” · Testosterone

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

All 185 zinc capsules

Vitamin D

2 authorised claims · 172 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 172 vitamin d capsules

Vitamin B6

1 authorised claim · 144 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity

All 144 vitamin b6 capsules

Vitamin B12

1 authorised claim · 123 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity

All 123 vitamin b12 capsules

Folate

1 authorised claim · 104 capsules · ingredient page
  • “Folate contributes to the normal function of the immune system” · Immunity

All 104 folate capsules

Selenium

2 authorised claims · 74 capsules · ingredient page
  • “Selenium contributes to the normal function of the immune system” · Immunity
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 74 selenium capsules

Iron

1 authorised claim · 60 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity

All 60 iron capsules

Copper

1 authorised claim · 42 capsules · ingredient page
  • “Copper contributes to the normal function of the immune system” · Immunity

All 42 copper capsules

Vitamin A

1 authorised claim · 40 capsules · ingredient page
  • “Vitamin A contributes to the normal function of the immune system” · Immunity

All 40 vitamin a capsules

Iodine

1 authorised claim · 38 capsules · ingredient page
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 38 iodine capsules

Glucomannan

1 authorised claim · 3 capsules · ingredient page
  • “Glucomannan in the context of an energy restricted diet contributes to weight loss” · Weight

Assessed by the register and not authorised

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

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