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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 Bones and Testosterone and Immunity and Focus

1582 capsules across 68 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.

Bones. Ingredients here hold register claims relating to the maintenance of normal bones, quoted exactly on their pages. Weight-bearing exercise and dietary calcium are the foundations, and the Royal Osteoporosis Society is the specialist charity for anything further.

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.

Focus. Some nutrients hold register claims relating to normal cognitive or psychological function, quoted exactly on their pages. The wording is precise and worth reading as written; anything beyond it is marketing, not authorised claim.

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

Magnesium

1 authorised claim · 258 capsules · ingredient page
  • “Magnesium contributes to the maintenance of normal bones” · Bones

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

All 258 magnesium capsules

Vitamin C

3 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
  • “Vitamin C contributes to normal collagen formation for the normal function of bones” · Bones

All 238 vitamin c capsules

Zinc

4 authorised claims · 185 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity
  • “Zinc contributes to the maintenance of normal bones” · Bones
  • “Zinc contributes to normal cognitive function” · Focus
  • “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

5 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
  • “Vitamin D contributes to the maintenance of normal bones” · Bones
  • “Vitamin D is needed for normal growth and development of bone in children.” · Bones
  • and 1 more on the ingredient page

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

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

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

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

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

Vitamin K

1 authorised claim · 80 capsules · ingredient page
  • “Vitamin K contributes to the maintenance of normal bones” · Bones

All 80 vitamin k capsules

Calcium

3 authorised claims · 76 capsules · ingredient page
  • “Calcium helps to reduce the loss of bone mineral in post-menopausal women. Low bone mineral density is a risk factor for osteoporotic bone fractures” · Bones
  • “Calcium is needed for normal growth and development of bone in children.” · Bones
  • “Calcium is needed for the maintenance of normal bones” · Bones

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

All 76 calcium 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

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

All 74 selenium capsules

Iron

3 authorised claims · 60 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity
  • “Iron contributes to normal cognitive function” · Focus
  • “Iron contributes to normal cognitive development of children” · Focus

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

Not authorised for bones: the register refused 2 claims there.

All 40 vitamin a capsules

Iodine

2 authorised claims · 38 capsules · ingredient page
  • “Iodine contributes to normal cognitive function” · Focus
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 38 iodine capsules

Manganese

1 authorised claim · 28 capsules · ingredient page
  • “Manganese contributes to the maintenance of normal bones” · Bones

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

All 28 manganese capsules

Pantothenic Acid

1 authorised claim · 28 capsules · ingredient page
  • “Pantothenic acid contributes to normal mental performance” · Focus

All 28 pantothenic acid capsules

Phosphorus

2 authorised claims · 2 capsules · ingredient page
  • “Phosphorus contributes to the maintenance of normal bones” · Bones
  • “Phosphorus is needed for the normal growth and development of bone in children” · Bones

Protein

2 authorised claims · 1 capsule · ingredient page
  • “Protein contributes to the maintenance of normal bones” · Bones
  • “Protein is needed for normal growth and development of bone in children.” · Bones

Assessed by the register and not authorised

The register looked at claims for these relating to thyroid and bones and testosterone and immunity and focus 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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