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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.

Blood and iron and Immunity and Metabolism

12 capsules across 16 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.

Immunity. This page gathers ingredients whose GB register claims relate to the normal function of the immune system, with the exact authorised wording quoted on each ingredient page. Anything not authorised may not be claimed by sellers, and we quote that status too. A balanced diet, sleep and vaccination advice from the NHS come before any capsule.

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.

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

4 authorised claims · 4 capsules · ingredient page
  • “Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise” · Immunity
  • “Vitamin C contributes to the normal function of the immune system” · Immunity
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin C increases iron absorption” · Blood and iron

All 4 vitamin c capsules

Calcium

2 authorised claims · 3 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.

Magnesium

1 authorised claim · 3 capsules · ingredient page
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

Not authorised for immunity or metabolism or blood and iron: the register refused 4 claims there.

Zinc

5 authorised claims · 3 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity
  • “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

Vitamin B12

4 authorised claims · 2 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity
  • “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

Vitamin B6

5 authorised claims · 2 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity
  • “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
  • and 1 more on the ingredient page

Chromium

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

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

Iron

4 authorised claims · 1 capsule · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity
  • “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 metabolism: the register refused 1 claim there.

Manganese

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

Assessed by the register and not authorised

The register looked at claims for these relating to blood and iron and immunity and metabolism 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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