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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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Thyroid and Sleep and Eyes and Blood sugar

1135 capsules across 29 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.

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.

Eyes. Ingredients here hold register claims relating to the maintenance of normal vision, quoted exactly on their pages. Regular sight tests catch what supplements never will; the Macular Society and RNIB below are the specialist organisations.

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.

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

Zinc

1 authorised claim · 249 capsules · ingredient page

“Zinc contributes to the maintenance of normal vision” · Eyes

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

All 249 zinc capsules

Selenium

1 authorised claim · 95 capsules · ingredient page

“Selenium contributes to the normal thyroid function” · Thyroid

All 95 selenium capsules

Chromium

1 authorised claim · 62 capsules · ingredient page

“Chromium contributes to the maintenance of normal blood glucose levels” · Blood sugar

All 62 chromium capsules

Vitamin A

1 authorised claim · 54 capsules · ingredient page

“Vitamin A contributes to the maintenance of normal vision” · Eyes

All 54 vitamin a capsules

Iodine

1 authorised claim · 45 capsules · ingredient page

“Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

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

All 45 iodine capsules

Riboflavin

1 authorised claim · 36 capsules · ingredient page

“Riboflavin contributes to the maintenance of normal vision” · Eyes

All 36 riboflavin capsules

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 sleep and eyes and blood sugar and turned them down. Sellers may not make them. Prices are shown for ingredients you named; the rest link to their register page.