Skip to content
BestCapsules

Find capsules by goal

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.

What do you want help with?

Where the register allows less than sellers suggest

Anything you already take or are considering?

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”.

Preferences

Seller-stated only: vegan means the seller says vegan.

Metabolism and Weight and Blood and iron

532 capsules across 37 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.

Weight. The register takes a strict line on weight claims, and very little is authorised. This page shows the real status of ingredients people discuss for weight, quoted exactly. The NHS Better Health programme below is the evidence-based starting point.

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.

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 · 132 capsules · ingredient page
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

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

All 132 magnesium capsules

Vitamin C

2 authorised claims · 106 capsules · ingredient page
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin C increases iron absorption” · Blood and iron

All 106 vitamin c capsules

Zinc

4 authorised claims · 71 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

All 71 zinc capsules

Vitamin B6

4 authorised claims · 62 capsules · ingredient page
  • “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
  • “Vitamin B6 contributes to normal red blood cell formation” · Blood and iron

All 62 vitamin b6 capsules

Folate

2 authorised claims · 57 capsules · ingredient page
  • “Folate contributes to normal blood formation” · Blood and iron
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

All 57 folate capsules

Biotin

2 authorised claims · 53 capsules · ingredient page
  • “Biotin contributes to normal energy-yielding metabolism” · Metabolism
  • “Biotin contributes to normal macronutrient metabolism” · Metabolism

All 53 biotin capsules

Vitamin B12

3 authorised claims · 51 capsules · ingredient page
  • “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

All 51 vitamin b12 capsules

Vitamin K

1 authorised claim · 39 capsules · ingredient page
  • “Vitamin K contributes to normal blood clotting” · Blood and iron

All 39 vitamin k capsules

Calcium

2 authorised claims · 28 capsules · ingredient page
  • “Calcium contributes to normal blood clotting” · Blood and iron
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism

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

All 28 calcium capsules

Iron

3 authorised claims · 19 capsules · ingredient page
  • “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.

All 19 iron capsules

Niacin

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

All 19 niacin capsules

Chromium

1 authorised claim · 18 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

Not authorised for weight or metabolism: the register refused 5 claims there.

All 18 chromium capsules

Vitamin A

1 authorised claim · 18 capsules · ingredient page
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

All 18 vitamin a capsules

Riboflavin

3 authorised claims · 17 capsules · ingredient page
  • “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

All 17 riboflavin capsules

Iodine

1 authorised claim · 16 capsules · ingredient page
  • “Iodine contributes to normal energy-yielding metabolism” · Metabolism

All 16 iodine capsules

Pantothenic Acid

2 authorised claims · 14 capsules · ingredient page
  • “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 14 pantothenic acid capsules

Choline

2 authorised claims · 10 capsules · ingredient page
  • “Choline contributes to normal homocysteine metabolism” · Metabolism
  • “Choline contributes to normal lipid metabolism” · Metabolism

All 10 choline capsules

Copper

2 authorised claims · 10 capsules · ingredient page
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism
  • “Copper contributes to normal iron transport in the body” · Blood and iron

All 10 copper capsules

Manganese

1 authorised claim · 10 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism

All 10 manganese capsules

Molybdenum

1 authorised claim · 5 capsules · ingredient page
  • “Molybdenum contributes to normal sulphur amino acid metabolism” · Metabolism

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

All 5 molybdenum capsules

Phosphorus

1 authorised claim · 2 capsules · ingredient page
  • “Phosphorus contributes to normal energy-yielding metabolism” · Metabolism

Thiamine

1 authorised claim · 2 capsules · ingredient page
  • “Thiamine contributes to normal energy-yielding metabolism” · Metabolism

Assessed by the register and not authorised

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

Independent organisations for support and reliable information; none endorses any product on this site.