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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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Thyroid and Bones and Sleep

1216 capsules across 33 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.

Bones. Ingredients here hold register claims relating to the maintenance of normal bones, quoted exactly on their pages. Weight-bearing exercise and dietary calcium are the foundations, and the Royal Osteoporosis Society is the specialist charity for anything further.

Sleep. Almost nothing holds an authorised GB register claim about sleep, and that absence is worth knowing in itself: sellers may not claim it either. Ingredients people discuss for sleep appear below with their actual register status, and The Sleep Charity offers evidence-based sleep advice.

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 · 108 capsules · ingredient page
  • “Magnesium contributes to the maintenance of normal bones” · Bones

All 108 magnesium capsules

Vitamin C

1 authorised claim · 68 capsules · ingredient page
  • “Vitamin C contributes to normal collagen formation for the normal function of bones” · Bones

All 68 vitamin c capsules

Vitamin D

3 authorised claims · 60 capsules · ingredient page
  • “Vitamin D contributes to the maintenance of normal bones” · Bones
  • “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.” · Bones
  • “Vitamin D is needed for normal growth and development of bone in children.” · Bones

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

All 60 vitamin d capsules

Zinc

1 authorised claim · 53 capsules · ingredient page
  • “Zinc contributes to the maintenance of normal bones” · Bones

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

All 53 zinc capsules

Calcium

3 authorised claims · 26 capsules · ingredient page
  • “Calcium is needed for the maintenance of normal bones” · Bones
  • “Calcium helps to reduce the loss of bone mineral in post-menopausal women. Low bone mineral density is a risk factor for osteoporotic bone fractures” · Bones
  • “Calcium is needed for normal growth and development of bone in children.” · Bones

All 26 calcium capsules

Vitamin K

1 authorised claim · 20 capsules · ingredient page
  • “Vitamin K contributes to the maintenance of normal bones” · Bones

All 20 vitamin k capsules

Selenium

1 authorised claim · 16 capsules · ingredient page
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 16 selenium capsules

Iodine

1 authorised claim · 8 capsules · ingredient page
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 8 iodine capsules

Manganese

1 authorised claim · 6 capsules · ingredient page
  • “Manganese contributes to the maintenance of normal bones” · Bones

All 6 manganese capsules

Protein

2 authorised claims · 1 capsule · ingredient page
  • “Protein contributes to the maintenance of normal bones” · Bones
  • “Protein is needed for normal growth and development of bone in children.” · Bones

Melatonin

2 authorised claims · ingredient page
  • “Melatonin contributes to the alleviation of subjective feelings of jet lag” · Sleep
  • “Melatonin contributes to the reduction of time taken to fall asleep” · Sleep

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

Melatonin is prescription only in the UK, so no merchant here lists it. It stays for information.

Assessed by the register and not authorised

The register looked at claims for these relating to thyroid and bones and sleep 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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