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.

Thyroid and Weight and Blood and iron

1253 capsules across 34 ingredients

Thyroid. Only iodine and selenium hold authorised register wording about the thyroid, quoted exactly on their pages. Thyroid conditions are diagnosed and managed by a GP, and the British Thyroid Foundation is the specialist charity.

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

Vitamin C

1 authorised claim · 238 capsules · ingredient page
  • “Vitamin C increases iron absorption” · Blood and iron

All 238 vitamin c capsules

Vitamin B6

1 authorised claim · 144 capsules · ingredient page
  • “Vitamin B6 contributes to normal red blood cell formation” · Blood and iron

All 144 vitamin b6 capsules

Vitamin B12

1 authorised claim · 123 capsules · ingredient page
  • “Vitamin B12 contributes to normal red blood cell formation” · Blood and iron

All 123 vitamin b12 capsules

Folate

1 authorised claim · 104 capsules · ingredient page
  • “Folate contributes to normal blood formation” · Blood and iron

All 104 folate capsules

Vitamin K

1 authorised claim · 80 capsules · ingredient page
  • “Vitamin K contributes to normal blood clotting” · Blood and iron

All 80 vitamin k capsules

Calcium

1 authorised claim · 76 capsules · ingredient page
  • “Calcium contributes to normal blood clotting” · Blood and iron

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

All 76 calcium capsules

Selenium

1 authorised claim · 74 capsules · ingredient page
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 74 selenium capsules

Iron

2 authorised claims · 60 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

All 60 iron capsules

Copper

1 authorised claim · 42 capsules · ingredient page
  • “Copper contributes to normal iron transport in the body” · Blood and iron

All 42 copper capsules

Iodine

1 authorised claim · 38 capsules · ingredient page
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 38 iodine capsules

Riboflavin

1 authorised claim · 29 capsules · ingredient page
  • “Riboflavin contributes to the maintenance of normal red blood cells” · Blood and iron

All 29 riboflavin capsules

Glucomannan

1 authorised claim · 3 capsules · ingredient page
  • “Glucomannan in the context of an energy restricted diet contributes to weight loss” · Weight

Assessed by the register and not authorised

The register looked at claims for these relating to thyroid 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.