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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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Metabolism and Blood and iron and Tiredness and fatigue

16 capsules across 19 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.

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.

Tiredness and fatigue. The register's phrase is 'a reduction of tiredness and fatigue', and a surprising number of everyday nutrients hold that authorised wording. This page shows which, quoted exactly, alongside ingredients people discuss without an authorised claim. Persistent tiredness is worth raising with a GP; the NHS link below covers self-help basics.

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

3 authorised claims · 7 capsules · ingredient page
  • “Vitamin C contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin C increases iron absorption” · Blood and iron

Not authorised for tiredness and fatigue: the register refused 1 claim there.

All 7 vitamin c capsules

Zinc

4 authorised claims · 5 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 tiredness and fatigue: the register refused 1 claim there.

All 5 zinc capsules

Biotin

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

Not authorised for tiredness and fatigue: the register refused 2 claims there.

Copper

2 authorised claims · 2 capsules · ingredient page
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism
  • “Copper contributes to normal iron transport in the body” · Blood and iron

Not authorised for tiredness and fatigue: the register refused 1 claim there.

Magnesium

2 authorised claims · 2 capsules · ingredient page
  • “Magnesium contributes to a reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

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

Vitamin A

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

Not authorised for tiredness and fatigue: the register refused 1 claim there.

Vitamin B12

4 authorised claims · 2 capsules · ingredient page
  • “Vitamin B12 contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “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 tiredness and fatigue: the register refused 1 claim there.

Vitamin B6

5 authorised claims · 2 capsules · ingredient page
  • “Vitamin B6 contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “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 or tiredness and fatigue: the register refused 3 claims there.

Folate

3 authorised claims · 1 capsule · ingredient page
  • “Folate contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Folate contributes to normal blood formation” · Blood and iron
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

Iodine

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

Niacin

2 authorised claims · 1 capsule · ingredient page
  • “Niacin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

Riboflavin

4 authorised claims · 1 capsule · ingredient page
  • “Riboflavin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “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

Vitamin K

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

Assessed by the register and not authorised

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