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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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Metabolism and Fertility and Thyroid

1278 capsules across 31 ingredients

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.

Fertility. Ingredients here hold register claims relating to fertility and reproduction, quoted exactly. UK guidance on folic acid before and during early pregnancy is the best-established nutritional advice in this area, and Fertility Network UK below offers wider support.

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.

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 · 27 capsules · ingredient page
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

Not authorised for metabolism or fertility: the register refused 3 claims there.

All 27 magnesium capsules

Vitamin C

1 authorised claim · 17 capsules · ingredient page
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism

All 17 vitamin c capsules

Zinc

5 authorised claims · 12 capsules · ingredient page
  • “Zinc contributes to normal fertility and reproduction” · Fertility
  • “Zinc contributes to normal carbohydrate metabolism” · Metabolism
  • “Zinc contributes to normal macronutrient metabolism” · Metabolism
  • “Zinc contributes to normal metabolism of fatty acids” · Metabolism
  • and 1 more on the ingredient page

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

All 12 zinc capsules

Vitamin B6

3 authorised claims · 10 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 10 vitamin b6 capsules

Biotin

2 authorised claims · 9 capsules · ingredient page
  • “Biotin contributes to normal energy-yielding metabolism” · Metabolism
  • “Biotin contributes to normal macronutrient metabolism” · Metabolism

All 9 biotin 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

Niacin

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

All 5 niacin capsules

Copper

1 authorised claim · 4 capsules · ingredient page
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism

All 4 copper capsules

Iron

1 authorised claim · 4 capsules · ingredient page
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism

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

All 4 iron capsules

Choline

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

Chromium

1 authorised claim · 3 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

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

Folate

2 authorised claims · 3 capsules · ingredient page
  • “Folate contributes to maternal tissue growth during pregnancy” · Fertility
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

Selenium

2 authorised claims · 3 capsules · ingredient page
  • “Selenium contributes to normal spermatogenesis” · Fertility
  • “Selenium contributes to the normal thyroid function” · Thyroid

Manganese

1 authorised claim · 2 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism

Molybdenum

1 authorised claim · 2 capsules · ingredient page
  • “Molybdenum contributes to normal sulphur amino acid metabolism” · Metabolism

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

Pantothenic Acid

2 authorised claims · 1 capsule · 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

Riboflavin

2 authorised claims · 1 capsule · ingredient page
  • “Riboflavin contributes to normal energy-yielding metabolism” · Metabolism
  • “Riboflavin contributes to the normal metabolism of iron” · Metabolism

Vitamin A

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

Vitamin B12

2 authorised claims · 1 capsule · ingredient page
  • “Vitamin B12 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Metabolism

Assessed by the register and not authorised

The register looked at claims for these relating to metabolism and fertility and thyroid 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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