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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 Tiredness and fatigue and Sleep

1291 capsules across 37 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.

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.

Sleep. Almost nothing holds an authorised GB register claim about sleep, and that absence is worth knowing in itself: sellers may not claim it either. Ingredients people discuss for sleep appear below with their actual register status, and The Sleep Charity offers evidence-based sleep advice.

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 · 108 capsules · ingredient page
  • “Magnesium contributes to a reduction of tiredness and fatigue” · Tiredness and fatigue

Not authorised for blood and iron: the register refused 1 claim there.

All 108 magnesium capsules

Vitamin C

2 authorised claims · 68 capsules · ingredient page
  • “Vitamin C contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Vitamin C increases iron absorption” · Blood and iron

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

All 68 vitamin c capsules

Vitamin B6

2 authorised claims · 44 capsules · ingredient page
  • “Vitamin B6 contributes to normal red blood cell formation” · Blood and iron
  • “Vitamin B6 contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 44 vitamin b6 capsules

Vitamin B12

2 authorised claims · 34 capsules · ingredient page
  • “Vitamin B12 contributes to normal red blood cell formation” · Blood and iron
  • “Vitamin B12 contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

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

All 34 vitamin b12 capsules

Folate

2 authorised claims · 30 capsules · ingredient page
  • “Folate contributes to normal blood formation” · Blood and iron
  • “Folate contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 30 folate capsules

Calcium

1 authorised claim · 26 capsules · ingredient page
  • “Calcium contributes to normal blood clotting” · Blood and iron

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

All 26 calcium capsules

Vitamin K

1 authorised claim · 20 capsules · ingredient page
  • “Vitamin K contributes to normal blood clotting” · Blood and iron

All 20 vitamin k capsules

Iron

3 authorised claims · 17 capsules · ingredient page
  • “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
  • “Iron contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 17 iron capsules

Copper

1 authorised claim · 13 capsules · ingredient page
  • “Copper contributes to normal iron transport in the body” · Blood and iron

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

All 13 copper capsules

Riboflavin

2 authorised claims · 11 capsules · ingredient page
  • “Riboflavin contributes to the maintenance of normal red blood cells” · Blood and iron
  • “Riboflavin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 11 riboflavin capsules

Niacin

1 authorised claim · 10 capsules · ingredient page
  • “Niacin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 10 niacin capsules

Pantothenic Acid

1 authorised claim · 6 capsules · ingredient page
  • “Pantothenic acid contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 6 pantothenic acid capsules

Melatonin

2 authorised claims · ingredient page
  • “Melatonin contributes to the alleviation of subjective feelings of jet lag” · Sleep
  • “Melatonin contributes to the reduction of time taken to fall asleep” · Sleep

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

Melatonin is prescription only in the UK, so no merchant here lists it. It stays for information.

Assessed by the register and not authorised

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