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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.

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Thyroid and Muscles and Digestion

1105 capsules across 47 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.

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.

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 · 27 capsules · ingredient page

“Magnesium contributes to normal muscle function” · Muscles

All 27 magnesium capsules

Vitamin D

2 authorised claims · 13 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 13 vitamin d capsules

Calcium

2 authorised claims · 5 capsules · ingredient page

“Calcium contributes to normal muscle function” · Muscles
“Calcium contributes to the normal function of digestive enzymes” · Digestion

All 5 calcium capsules

Potassium

1 authorised claim · 5 capsules · ingredient page

“Potassium contributes to normal muscle function” · Muscles

All 5 potassium capsules

creatine

2 authorised claims · 3 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.

Selenium

1 authorised claim · 3 capsules · ingredient page

“Selenium contributes to the normal thyroid function” · Thyroid

Activated Charcoal

1 authorised claim · 2 capsules · ingredient page

“Activated charcoal contributes to reducing excessive flatulence after eating” · Digestion

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

Assessed by the register and not authorised

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