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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.

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

Thyroid and Metabolism and Sleep

86 capsules across 26 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.

Metabolism. The register's phrase is 'contributes to normal energy-yielding metabolism', and many everyday vitamins and minerals hold it. It is not a claim about weight or about feeling energetic, which is why this goal sits apart from Weight and from Tiredness and fatigue. Wording is quoted exactly on each ingredient page.

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

1 authorised claim · 36 capsules · ingredient page
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism

All 36 vitamin c capsules

Zinc

4 authorised claims · 32 capsules · ingredient page
  • “Zinc contributes to normal carbohydrate metabolism” · Metabolism
  • “Zinc contributes to normal macronutrient metabolism” · Metabolism
  • “Zinc contributes to normal metabolism of fatty acids” · Metabolism
  • “Zinc contributes to normal metabolism of vitamin A” · Metabolism

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

All 32 zinc capsules

Vitamin B6

3 authorised claims · 24 capsules · ingredient page
  • “Vitamin B6 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B6 contributes to normal homocysteine metabolism” · Metabolism
  • “Vitamin B6 contributes to normal protein and glycogen metabolism” · Metabolism

All 24 vitamin b6 capsules

Magnesium

1 authorised claim · 18 capsules · ingredient page
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

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

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

2 authorised claims · 14 capsules · ingredient page
  • “Vitamin B12 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Metabolism

All 14 vitamin b12 capsules

Biotin

2 authorised claims · 13 capsules · ingredient page
  • “Biotin contributes to normal energy-yielding metabolism” · Metabolism
  • “Biotin contributes to normal macronutrient metabolism” · Metabolism

All 13 biotin capsules

Copper

1 authorised claim · 9 capsules · ingredient page
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism

All 9 copper capsules

Iron

1 authorised claim · 9 capsules · ingredient page
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism

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

All 9 iron capsules

Iodine

2 authorised claims · 8 capsules · ingredient page
  • “Iodine contributes to normal energy-yielding metabolism” · Metabolism
  • “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 homocysteine metabolism” · Metabolism

All 7 folate capsules

Calcium

1 authorised claim · 5 capsules · ingredient page
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism

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

All 5 calcium capsules

Chromium

1 authorised claim · 5 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

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

All 5 chromium capsules

Manganese

1 authorised claim · 5 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism

All 5 manganese capsules

Niacin

1 authorised claim · 5 capsules · ingredient page
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

All 5 niacin capsules

Pantothenic Acid

2 authorised claims · 5 capsules · ingredient page
  • “Pantothenic acid contributes to normal energy-yielding metabolism” · Metabolism
  • “Pantothenic acid contributes to normal synthesis and metabolism of steroid hormones, vitamin D and some neurotransmitters” · Metabolism

All 5 pantothenic acid capsules

Riboflavin

2 authorised claims · 5 capsules · ingredient page
  • “Riboflavin contributes to normal energy-yielding metabolism” · Metabolism
  • “Riboflavin contributes to the normal metabolism of iron” · Metabolism

All 5 riboflavin capsules

Choline

2 authorised claims · 3 capsules · ingredient page
  • “Choline contributes to normal homocysteine metabolism” · Metabolism
  • “Choline contributes to normal lipid metabolism” · Metabolism

Vitamin A

1 authorised claim · 2 capsules · ingredient page
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

Molybdenum

1 authorised claim · 1 capsule · ingredient page
  • “Molybdenum contributes to normal sulphur amino acid metabolism” · Metabolism

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

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 metabolism 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.

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