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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 Joints

1398 capsules across 53 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.

Joints. Joints carry the largest set of refused claims in the register: glucosamine, chondroitin, MSM, turmeric and collagen-for-joints wording were all assessed and turned down. What is authorised is narrow and quoted exactly on the ingredient pages: vitamin C for normal collagen formation for the normal function of cartilage, and manganese for normal formation of connective tissue. Versus Arthritis is the specialist charity for anything beyond nutrition.

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 · 334 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 334 magnesium capsules

Vitamin C

3 authorised claims · 332 capsules · ingredient page
  • “Vitamin C contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Vitamin C contributes to normal collagen formation for the normal function of cartilage” · Joints
  • “Vitamin C increases iron absorption” · Blood and iron

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

All 332 vitamin c capsules

Vitamin B6

2 authorised claims · 185 capsules · ingredient page
  • “Vitamin B6 contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Vitamin B6 contributes to normal red blood cell formation” · Blood and iron

All 185 vitamin b6 capsules

Vitamin B12

2 authorised claims · 163 capsules · ingredient page
  • “Vitamin B12 contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Vitamin B12 contributes to normal red blood cell formation” · Blood and iron

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

All 163 vitamin b12 capsules

Folate

2 authorised claims · 138 capsules · ingredient page
  • “Folate contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Folate contributes to normal blood formation” · Blood and iron

All 138 folate capsules

Vitamin K

1 authorised claim · 106 capsules · ingredient page
  • “Vitamin K contributes to normal blood clotting” · Blood and iron

All 106 vitamin k capsules

Calcium

1 authorised claim · 96 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 96 calcium capsules

Iron

3 authorised claims · 87 capsules · ingredient page
  • “Iron contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “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

All 87 iron capsules

Copper

2 authorised claims · 58 capsules · ingredient page
  • “Copper contributes to maintenance of normal connective tissues” · Joints
  • “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 58 copper capsules

Niacin

1 authorised claim · 46 capsules · ingredient page
  • “Niacin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 46 niacin capsules

Pantothenic Acid

1 authorised claim · 36 capsules · ingredient page
  • “Pantothenic acid contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue

All 36 pantothenic acid capsules

Riboflavin

2 authorised claims · 36 capsules · ingredient page
  • “Riboflavin contributes to the reduction of tiredness and fatigue” · Tiredness and fatigue
  • “Riboflavin contributes to the maintenance of normal red blood cells” · Blood and iron

All 36 riboflavin capsules

Manganese

1 authorised claim · 32 capsules · ingredient page
  • “Manganese contributes to the normal formation of connective tissue” · Joints

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

All 32 manganese capsules

Assessed by the register and not authorised

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