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BestCapsules

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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.

Digestion and Mood and Testosterone and Focus

1433 capsules across 57 ingredients

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.

Mood. The register authorises wording for some nutrients relating to normal psychological function, and this page shows which, quoted exactly. Low mood that persists deserves real support rather than a capsule; Mind's information and helplines below are a good place to start.

Testosterone. Only a small number of ingredients hold register claims mentioning testosterone, and this page quotes them exactly. Claims in this category are heavily marketed well beyond what the register authorises; the split below shows the line.

Focus. Some nutrients hold register claims relating to normal cognitive or psychological function, quoted exactly on their pages. The wording is precise and worth reading as written; anything beyond it is marketing, not authorised claim.

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 normal psychological function” · Mood

All 334 magnesium capsules

Vitamin C

1 authorised claim · 332 capsules · ingredient page
  • “Vitamin C contributes to normal psychological function” · Mood

All 332 vitamin c capsules

Zinc

2 authorised claims · 249 capsules · ingredient page
  • “Zinc contributes to normal cognitive function” · Focus
  • “Zinc contributes to the maintenance of normal testosterone levels in the blood” · Testosterone

All 249 zinc capsules

Vitamin B6

1 authorised claim · 185 capsules · ingredient page
  • “Vitamin B6 contributes to normal psychological function” · Mood

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

All 185 vitamin b6 capsules

Vitamin B12

1 authorised claim · 163 capsules · ingredient page
  • “Vitamin B12 contributes to normal psychological function” · Mood

All 163 vitamin b12 capsules

Folate

1 authorised claim · 138 capsules · ingredient page
  • “Folate contributes to normal psychological function” · Mood

All 138 folate capsules

Biotin

1 authorised claim · 124 capsules · ingredient page
  • “Biotin contributes to normal psychological function” · Mood

All 124 biotin capsules

Calcium

1 authorised claim · 96 capsules · ingredient page
  • “Calcium contributes to the normal function of digestive enzymes” · Digestion

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

All 96 calcium capsules

Iron

2 authorised claims · 87 capsules · ingredient page
  • “Iron contributes to normal cognitive function” · Focus
  • “Iron contributes to normal cognitive development of children” · Focus

All 87 iron capsules

Niacin

1 authorised claim · 46 capsules · ingredient page
  • “Niacin contributes to normal psychological function” · Mood

All 46 niacin capsules

Iodine

1 authorised claim · 45 capsules · ingredient page
  • “Iodine contributes to normal cognitive function” · Focus

All 45 iodine capsules

Pantothenic Acid

1 authorised claim · 36 capsules · ingredient page
  • “Pantothenic acid contributes to normal mental performance” · Focus

All 36 pantothenic acid capsules

Activated Charcoal

1 authorised claim · 17 capsules · ingredient page
  • “Activated charcoal contributes to reducing excessive flatulence after eating” · Digestion

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

All 17 activated charcoal capsules

Chloride

1 authorised claim · 5 capsules · ingredient page
  • “Chloride contributes to normal digestion by production of hydrochloric acid in the stomach” · Digestion

All 5 chloride capsules

Thiamine

1 authorised claim · 5 capsules · ingredient page
  • “Thiamine contributes to normal psychological function” · Mood

All 5 thiamine 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

Lactase enzyme

1 authorised claim · 3 capsules · ingredient page
  • “Lactase enzyme improves lactose digestion in individuals who have difficulty digesting lactose” · Digestion

All 3 lactase enzyme capsules

Assessed by the register and not authorised

The register looked at claims for these relating to digestion and mood and testosterone and focus 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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