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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 Heart and Testosterone and Immunity and Sleep

1498 capsules across 73 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.

Heart. This page collects ingredients whose register claims relate to the heart, blood pressure or cholesterol, quoted exactly. Diet, movement and prescribed medication come first in this area, and the British Heart Foundation below is the specialist charity for reliable information.

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.

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.

Sleep. Almost nothing holds an authorised GB register claim about sleep, and that absence is worth knowing in itself: sellers may not claim it either. Ingredients people discuss for sleep appear below with their actual register status, and The Sleep Charity offers evidence-based sleep advice.

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

3 authorised claims · 332 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
  • “Vitamin C contributes to normal collagen formation for the normal function of blood vessels” · Heart

All 332 vitamin c capsules

Zinc

2 authorised claims · 249 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 or heart: the register refused 2 claims there.

All 249 zinc capsules

Vitamin D

2 authorised claims · 232 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 232 vitamin d capsules

Vitamin B6

2 authorised claims · 185 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity
  • “Vitamin B6 contributes to normal homocysteine metabolism” · Heart

All 185 vitamin b6 capsules

Vitamin B12

2 authorised claims · 163 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Heart

All 163 vitamin b12 capsules

Folate

2 authorised claims · 138 capsules · ingredient page
  • “Folate contributes to the normal function of the immune system” · Immunity
  • “Folate contributes to normal homocysteine metabolism” · Heart

All 138 folate capsules

Selenium

2 authorised claims · 95 capsules · ingredient page
  • “Selenium contributes to the normal function of the immune system” · Immunity
  • “Selenium contributes to the normal thyroid function” · Thyroid

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

All 95 selenium capsules

Iron

1 authorised claim · 87 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity

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

All 87 iron capsules

Copper

1 authorised claim · 58 capsules · ingredient page
  • “Copper contributes to the normal function of the immune system” · Immunity

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

All 58 copper capsules

Vitamin A

1 authorised claim · 54 capsules · ingredient page
  • “Vitamin A contributes to the normal function of the immune system” · Immunity

All 54 vitamin a capsules

Choline

1 authorised claim · 49 capsules · ingredient page
  • “Choline contributes to normal homocysteine metabolism” · Heart

All 49 choline capsules

Iodine

1 authorised claim · 45 capsules · ingredient page
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 45 iodine capsules

Potassium

1 authorised claim · 32 capsules · ingredient page
  • “Potassium contributes to the maintenance of normal blood pressure” · Heart

All 32 potassium capsules

Glucomannan

1 authorised claim · 6 capsules · ingredient page
  • “Glucomannan contributes to the maintenance of normal blood cholesterol levels” · Heart

All 6 glucomannan capsules

Thiamine

1 authorised claim · 5 capsules · ingredient page
  • “Thiamine contributes to the normal function of the heart” · Heart

All 5 thiamine capsules

Beta Glucans

1 authorised claim · 4 capsules · ingredient page
  • “Beta-glucans contribute to the maintenance of normal blood cholesterol levels” · Heart

All 4 beta glucans capsules

Chitosan

1 authorised claim · 4 capsules · ingredient page
  • “Chitosan contributes to the maintenance of normal blood cholesterol levels” · Heart

All 4 chitosan capsules

Betaine

1 authorised claim · 2 capsules · ingredient page
  • “Betaine contributes to normal homocysteine metabolism” · Heart

Alpha-Linolenic Acid

1 authorised claim · 1 capsule · ingredient page
  • “ALA contributes to the maintenance of normal blood cholesterol levels” · Heart

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

Oleic acid

1 authorised claim · 1 capsule · ingredient page
  • “Replacing saturated fats in the diet with unsaturated fats contributes to the maintenance of normal blood cholesterol levels. Oleic acid is an unsaturated fat.” · Heart

Melatonin

2 authorised claims · ingredient page
  • “Melatonin contributes to the alleviation of subjective feelings of jet lag” · Sleep
  • “Melatonin contributes to the reduction of time taken to fall asleep” · Sleep

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

Melatonin is prescription only in the UK, so no merchant here lists it. It stays for information.

Assessed by the register and not authorised

The register looked at claims for these relating to thyroid and heart and testosterone and immunity and sleep 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

Independent organisations for support and reliable information; none endorses any product on this site.