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 Immunity and Digestion

717 capsules across 61 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.

Immunity. This page gathers ingredients whose GB register claims relate to the normal function of the immune system, with the exact authorised wording quoted on each ingredient page. Anything not authorised may not be claimed by sellers, and we quote that status too. A balanced diet, sleep and vaccination advice from the NHS come before any capsule.

Digestion. The register authorises specific wording about digestion for a few nutrients, quoted exactly on their pages, and refused most of the probiotic and gut wording sellers reach for. The split below is the honest picture. Persistent digestive symptoms are a matter for a GP, and Guts 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

1 authorised claim · 167 capsules · ingredient page
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

Not authorised for immunity or metabolism: the register refused 3 claims there.

All 167 magnesium capsules

Vitamin C

3 authorised claims · 145 capsules · ingredient page
  • “Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise” · Immunity
  • “Vitamin C contributes to the normal function of the immune system” · Immunity
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism

All 145 vitamin c capsules

Zinc

5 authorised claims · 108 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity
  • “Zinc contributes to normal carbohydrate metabolism” · Metabolism
  • “Zinc contributes to normal macronutrient metabolism” · Metabolism
  • “Zinc contributes to normal metabolism of fatty acids” · Metabolism
  • and 1 more on the ingredient page

All 108 zinc capsules

Vitamin B6

4 authorised claims · 100 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity
  • “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 D

2 authorised claims · 100 capsules · ingredient page
  • “Vitamin D contributes to the normal function of the immune system” · Immunity
  • “Vitamin D contributes to the normal function of the immune system in children.” · Immunity

All 100 vitamin d capsules

Vitamin B12

3 authorised claims · 80 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity
  • “Vitamin B12 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Metabolism

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

All 65 biotin capsules

Folate

2 authorised claims · 64 capsules · ingredient page
  • “Folate contributes to the normal function of the immune system” · Immunity
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

All 64 folate capsules

Selenium

1 authorised claim · 45 capsules · ingredient page
  • “Selenium contributes to the normal function of the immune system” · Immunity

All 45 selenium capsules

Calcium

2 authorised claims · 41 capsules · ingredient page
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism
  • “Calcium contributes to the normal function of digestive enzymes” · Digestion

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

All 41 calcium capsules

Iron

2 authorised claims · 37 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism

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

All 37 iron capsules

Chromium

1 authorised claim · 30 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

Not authorised for metabolism: the register refused 2 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

1 authorised claim · 20 capsules · ingredient page
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

All 20 niacin capsules

Copper

2 authorised claims · 19 capsules · ingredient page
  • “Copper contributes to the normal function of the immune system” · Immunity
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism

All 19 copper capsules

Vitamin A

2 authorised claims · 19 capsules · ingredient page
  • “Vitamin A contributes to the normal function of the immune system” · Immunity
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

All 19 vitamin a capsules

Riboflavin

2 authorised claims · 17 capsules · ingredient page
  • “Riboflavin contributes to normal energy-yielding metabolism” · Metabolism
  • “Riboflavin contributes to the normal metabolism of iron” · Metabolism

All 17 riboflavin capsules

Pantothenic Acid

2 authorised claims · 16 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 16 pantothenic acid capsules

Manganese

1 authorised claim · 11 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism

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

Activated Charcoal

1 authorised claim · 7 capsules · ingredient page
  • “Activated charcoal contributes to reducing excessive flatulence after eating” · Digestion

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

All 7 activated charcoal capsules

sugar beet fibre

1 authorised claim · 4 capsules · ingredient page
  • “Sugar beet fibre contributes to an increase in faecal bulk” · Digestion

Not authorised for digestion: the register refused 2 claims there.

All 4 sugar beet fibre capsules

Chloride

1 authorised claim · 3 capsules · ingredient page
  • “Chloride contributes to normal digestion by production of hydrochloric acid in the stomach” · Digestion

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

Lactase enzyme

1 authorised claim · 1 capsule · ingredient page
  • “Lactase enzyme improves lactose digestion in individuals who have difficulty digesting lactose” · Digestion

Assessed by the register and not authorised

The register looked at claims for these relating to metabolism and immunity and digestion 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.