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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.

Thyroid and Muscles and Skin, hair and nails

572 capsules across 56 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.

Muscles. Ingredients here hold register claims relating to normal muscle function or muscle protein, quoted exactly on their pages. Resistance exercise and overall protein intake are the fundamentals the claims assume; the NHS exercise guidance below is a good starting point.

Skin, hair and nails. The register authorises specific wording for several nutrients relating to normal skin, hair or nails, and this page collects them with the wording quoted exactly. Marketing in this category runs far ahead of the register; the split below shows exactly where the line sits.

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 muscle function” · Muscles

All 132 magnesium capsules

Vitamin C

1 authorised claim · 106 capsules · ingredient page
  • “Vitamin C contributes to normal collagen formation for the normal function of skin” · Skin, hair and nails

All 106 vitamin c capsules

Vitamin D

2 authorised claims · 76 capsules · ingredient page
  • “Vitamin D contributes to the maintenance of normal muscle function” · Muscles
  • “Vitamin D helps to reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures among men and women 60 years of age and older.” · Muscles

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

All 76 vitamin d capsules

Zinc

3 authorised claims · 71 capsules · ingredient page
  • “Zinc contributes to the maintenance of normal nails” · Skin, hair and nails
  • “Zinc contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Zinc contributes to the maintenance of normal hair” · Skin, hair and nails

Not authorised for thyroid or muscles: the register refused 2 claims there.

All 71 zinc capsules

Biotin

2 authorised claims · 53 capsules · ingredient page
  • “Biotin contributes to the maintenance of normal hair” · Skin, hair and nails
  • “Biotin contributes to the maintenance of normal skin” · Skin, hair and nails

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 53 biotin capsules

Calcium

1 authorised claim · 28 capsules · ingredient page
  • “Calcium contributes to normal muscle function” · Muscles

All 28 calcium capsules

Selenium

3 authorised claims · 28 capsules · ingredient page
  • “Selenium contributes to the maintenance of normal nails” · Skin, hair and nails
  • “Selenium contributes to the maintenance of normal hair” · Skin, hair and nails
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 28 selenium capsules

Niacin

1 authorised claim · 19 capsules · ingredient page
  • “Niacin contributes to the maintenance of normal skin” · Skin, hair and nails

All 19 niacin capsules

Vitamin A

1 authorised claim · 18 capsules · ingredient page
  • “Vitamin A contributes to the maintenance of normal skin” · Skin, hair and nails

Not authorised for muscles or skin, hair and nails: the register refused 2 claims there.

All 18 vitamin a capsules

Potassium

1 authorised claim · 17 capsules · ingredient page
  • “Potassium contributes to normal muscle function” · Muscles

All 17 potassium capsules

Riboflavin

1 authorised claim · 17 capsules · ingredient page
  • “Riboflavin contributes to the maintenance of normal skin” · Skin, hair and nails

All 17 riboflavin capsules

Iodine

2 authorised claims · 16 capsules · ingredient page
  • “Iodine contributes to the maintenance of normal skin” · Skin, hair and nails
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

Not authorised for skin, hair and nails: the register refused 1 claim there.

All 16 iodine capsules

Copper

2 authorised claims · 10 capsules · ingredient page
  • “Copper contributes to normal hair pigmentation” · Skin, hair and nails
  • “Copper contributes to normal skin pigmentation” · Skin, hair and nails

All 10 copper capsules

creatine

2 authorised claims · 10 capsules · ingredient page
  • “Daily creatine consumption can enhance the effect of resistance training on muscle strength in adults over the age of 55.” · Muscles
  • “Creatine increases physical performance in successive bursts of short-term, high intensity exercise” · Muscles

Not authorised for muscles: the register refused 3 claims there.

All 10 creatine capsules

Assessed by the register and not authorised

The register looked at claims for these relating to thyroid and muscles and skin, hair and nails 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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