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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.

  • None yet. Type an ingredient in the box above, for example “magnesium” or “turmeric”.

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

Thyroid and Sleep and Mood

74 capsules across 13 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.

Mood. The register authorises wording for some nutrients relating to normal psychological function, and this page shows which, quoted exactly. Low mood that persists deserves real support rather than a capsule; Mind's information and helplines below are a good place to start.

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

1 authorised claim · 36 capsules · ingredient page
  • “Vitamin C contributes to normal psychological function” · Mood

All 36 vitamin c capsules

Vitamin B6

1 authorised claim · 24 capsules · ingredient page
  • “Vitamin B6 contributes to normal psychological function” · Mood

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

All 24 vitamin b6 capsules

Magnesium

1 authorised claim · 18 capsules · ingredient page
  • “Magnesium contributes to normal psychological function” · Mood

All 18 magnesium capsules

Selenium

1 authorised claim · 18 capsules · ingredient page
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 18 selenium capsules

Vitamin B12

1 authorised claim · 14 capsules · ingredient page
  • “Vitamin B12 contributes to normal psychological function” · Mood

All 14 vitamin b12 capsules

Biotin

1 authorised claim · 13 capsules · ingredient page
  • “Biotin contributes to normal psychological function” · Mood

All 13 biotin 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

Folate

1 authorised claim · 7 capsules · ingredient page
  • “Folate contributes to normal psychological function” · Mood

All 7 folate capsules

Niacin

1 authorised claim · 5 capsules · ingredient page
  • “Niacin contributes to normal psychological function” · Mood

All 5 niacin 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 mood 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.