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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.

Metabolism and Tiredness and fatigue and Blood sugar

624 capsules across 45 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.

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.

Blood sugar. A small number of ingredients hold authorised register wording about normal blood glucose levels, quoted exactly on their pages; a much larger number of claims about blood sugar were assessed and refused. Nothing here is about treating or preventing diabetes, and anyone managing blood glucose should follow their care team's advice. Diabetes UK 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

2 authorised claims · 167 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 sugar: the register refused 3 claims there.

All 167 magnesium capsules

Vitamin C

2 authorised claims · 145 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

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

All 145 vitamin c capsules

Zinc

4 authorised claims · 108 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 108 zinc capsules

Vitamin B6

4 authorised claims · 100 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

All 100 vitamin b6 capsules

Vitamin B12

3 authorised claims · 80 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

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

All 80 vitamin b12 capsules

Biotin

2 authorised claims · 65 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.

All 65 biotin capsules

Folate

2 authorised claims · 64 capsules · ingredient page
  • “Folate contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

All 64 folate capsules

Calcium

1 authorised claim · 41 capsules · ingredient page
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism

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

All 41 calcium capsules

Iron

2 authorised claims · 37 capsules · ingredient page
  • “Iron contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism

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

All 37 iron capsules

Chromium

2 authorised claims · 30 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism
  • “Chromium contributes to the maintenance of normal blood glucose levels” · Blood sugar

Not authorised for metabolism or tiredness and fatigue: the register refused 3 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

1 authorised claim · 24 capsules · ingredient page
  • “Iodine contributes to normal energy-yielding metabolism” · Metabolism

All 24 iodine capsules

Niacin

2 authorised claims · 20 capsules · ingredient page
  • “Niacin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

All 20 niacin capsules

Copper

1 authorised claim · 19 capsules · ingredient page
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism

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

All 19 copper capsules

Vitamin A

1 authorised claim · 19 capsules · ingredient page
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

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

All 19 vitamin a capsules

Riboflavin

3 authorised claims · 17 capsules · 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 normal metabolism of iron” · Metabolism

All 17 riboflavin capsules

Pantothenic Acid

3 authorised claims · 16 capsules · ingredient page
  • “Pantothenic acid contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “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

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

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 metabolism and tiredness and fatigue and blood sugar and turned them down. Sellers may not make them. Prices are shown for ingredients you named; the rest link to their register page.

Support & information

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