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

Blood and iron and Metabolism and Skin, hair and nails

672 capsules across 58 ingredients

Blood and iron. Ingredients here hold register wording about normal red blood cell formation, oxygen transport, iron absorption or normal blood clotting, quoted exactly on their pages. Suspected iron deficiency needs a blood test before a supplement; the NHS page below explains why.

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.

Skin, hair and nails. The register authorises specific wording for several nutrients relating to normal skin, hair or nails, and this page collects them with the wording quoted exactly. Marketing in this category runs far ahead of the register; the split below shows exactly where the line sits.

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

Not authorised for metabolism or blood and iron: the register refused 3 claims there.

All 167 magnesium capsules

Vitamin C

3 authorised claims · 145 capsules · ingredient page
  • “Vitamin C contributes to normal collagen formation for the normal function of skin” · Skin, hair and nails
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin C increases iron absorption” · Blood and iron

All 145 vitamin c capsules

Zinc

7 authorised claims · 108 capsules · ingredient page
  • “Zinc contributes to the maintenance of normal nails” · Skin, hair and nails
  • “Zinc contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Zinc contributes to the maintenance of normal hair” · Skin, hair and nails
  • “Zinc contributes to normal carbohydrate metabolism” · Metabolism
  • and 3 more on the ingredient page

All 108 zinc capsules

Vitamin B6

4 authorised claims · 100 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
  • “Vitamin B6 contributes to normal red blood cell formation” · Blood and iron

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 100 vitamin b6 capsules

Vitamin B12

3 authorised claims · 80 capsules · ingredient page
  • “Vitamin B12 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Metabolism
  • “Vitamin B12 contributes to normal red blood cell formation” · Blood and iron

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 80 vitamin b12 capsules

Biotin

4 authorised claims · 65 capsules · ingredient page
  • “Biotin contributes to the maintenance of normal hair” · Skin, hair and nails
  • “Biotin contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Biotin contributes to normal energy-yielding metabolism” · Metabolism
  • “Biotin contributes to normal macronutrient metabolism” · Metabolism

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 65 biotin capsules

Folate

2 authorised claims · 64 capsules · ingredient page
  • “Folate contributes to normal blood formation” · Blood and iron
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

All 64 folate capsules

Vitamin K

1 authorised claim · 55 capsules · ingredient page
  • “Vitamin K contributes to normal blood clotting” · Blood and iron

All 55 vitamin k capsules

Selenium

2 authorised claims · 45 capsules · ingredient page
  • “Selenium contributes to the maintenance of normal nails” · Skin, hair and nails
  • “Selenium contributes to the maintenance of normal hair” · Skin, hair and nails

All 45 selenium capsules

Calcium

2 authorised claims · 41 capsules · ingredient page
  • “Calcium contributes to normal blood clotting” · Blood and iron
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism

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

All 41 calcium capsules

Iron

3 authorised claims · 37 capsules · ingredient page
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism
  • “Iron contributes to normal formation of red blood cells and haemoglobin” · Blood and iron
  • “Iron contributes to normal oxygen transport in the body” · Blood and iron

Not authorised for skin, hair and nails or metabolism: the register refused 2 claims there.

All 37 iron capsules

Chromium

1 authorised claim · 30 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

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

All 30 chromium capsules

Choline

2 authorised claims · 27 capsules · ingredient page
  • “Choline contributes to normal homocysteine metabolism” · Metabolism
  • “Choline contributes to normal lipid metabolism” · Metabolism

All 27 choline capsules

Iodine

2 authorised claims · 24 capsules · ingredient page
  • “Iodine contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Iodine contributes to normal energy-yielding metabolism” · Metabolism

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 24 iodine capsules

Niacin

2 authorised claims · 20 capsules · ingredient page
  • “Niacin contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

All 20 niacin capsules

Copper

4 authorised claims · 19 capsules · ingredient page
  • “Copper contributes to normal hair pigmentation” · Skin, hair and nails
  • “Copper contributes to normal skin pigmentation” · Skin, hair and nails
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism
  • “Copper contributes to normal iron transport in the body” · Blood and iron

All 19 copper capsules

Vitamin A

2 authorised claims · 19 capsules · ingredient page
  • “Vitamin A contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 19 vitamin a capsules

Riboflavin

4 authorised claims · 17 capsules · ingredient page
  • “Riboflavin contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Riboflavin contributes to normal energy-yielding metabolism” · Metabolism
  • “Riboflavin contributes to the maintenance of normal red blood cells” · Blood and iron
  • “Riboflavin contributes to the normal metabolism of iron” · Metabolism

All 17 riboflavin capsules

Pantothenic Acid

2 authorised claims · 16 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 16 pantothenic acid capsules

Manganese

1 authorised claim · 11 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism

All 11 manganese capsules

Molybdenum

1 authorised claim · 8 capsules · ingredient page
  • “Molybdenum contributes to normal sulphur amino acid metabolism” · Metabolism

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

All 8 molybdenum capsules

Thiamine

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

Betaine

1 authorised claim · 1 capsule · ingredient page
  • “Betaine contributes to normal homocysteine metabolism” · Metabolism

Assessed by the register and not authorised

The register looked at claims for these relating to blood and iron and metabolism and skin, hair and nails 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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