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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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Blood sugar and Muscles and Thyroid

72 capsules across 22 ingredients

Blood sugar. A small number of ingredients hold authorised register wording about normal blood glucose levels, quoted exactly on their pages; a much larger number of claims about blood sugar were assessed and refused. Nothing here is about treating or preventing diabetes, and anyone managing blood glucose should follow their care team's advice. Diabetes UK 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.

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.

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 D

2 authorised claims · 22 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 22 vitamin d capsules

Magnesium

1 authorised claim · 18 capsules · ingredient page
  • “Magnesium contributes to normal muscle function” · Muscles

Not authorised for blood sugar: the register refused 1 claim there.

All 18 magnesium capsules

Selenium

1 authorised claim · 18 capsules · ingredient page
  • “Selenium contributes to the normal thyroid function” · Thyroid

All 18 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

Calcium

1 authorised claim · 5 capsules · ingredient page
  • “Calcium contributes to normal muscle function” · Muscles

All 5 calcium capsules

Chromium

1 authorised claim · 5 capsules · ingredient page
  • “Chromium contributes to the maintenance of normal blood glucose levels” · Blood sugar

All 5 chromium capsules

Potassium

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

Assessed by the register and not authorised

The register looked at claims for these relating to blood sugar and muscles and thyroid 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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