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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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Testosterone and Thyroid and Focus and Muscles

1188 capsules across 49 ingredients

Testosterone. Only a small number of ingredients hold register claims mentioning testosterone, and this page quotes them exactly. Claims in this category are heavily marketed well beyond what the register authorises; the split below shows the line.

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.

Focus. Some nutrients hold register claims relating to normal cognitive or psychological function, quoted exactly on their pages. The wording is precise and worth reading as written; anything beyond it is marketing, not authorised claim.

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.

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 · 258 capsules · ingredient page
  • “Magnesium contributes to normal muscle function” · Muscles

All 258 magnesium capsules

Zinc

2 authorised claims · 185 capsules · ingredient page
  • “Zinc contributes to normal cognitive function” · Focus
  • “Zinc contributes to the maintenance of normal testosterone levels in the blood” · Testosterone

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

All 185 zinc capsules

Vitamin D

2 authorised claims · 172 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 172 vitamin d capsules

Calcium

1 authorised claim · 76 capsules · ingredient page
  • “Calcium contributes to normal muscle function” · Muscles

Not authorised for focus: 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

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

All 74 selenium capsules

Iron

2 authorised claims · 60 capsules · ingredient page
  • “Iron contributes to normal cognitive function” · Focus
  • “Iron contributes to normal cognitive development of children” · Focus

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

All 60 iron capsules

Iodine

2 authorised claims · 38 capsules · ingredient page
  • “Iodine contributes to normal cognitive function” · Focus
  • “Iodine contributes to the normal production of thyroid hormones and normal thyroid function” · Thyroid

All 38 iodine capsules

Pantothenic Acid

1 authorised claim · 28 capsules · ingredient page
  • “Pantothenic acid contributes to normal mental performance” · Focus

All 28 pantothenic acid capsules

Potassium

1 authorised claim · 25 capsules · ingredient page
  • “Potassium contributes to normal muscle function” · Muscles

All 25 potassium capsules

creatine

2 authorised claims · 18 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 or focus: the register refused 6 claims there.

All 18 creatine capsules

Protein

2 authorised claims · 1 capsule · ingredient page
  • “Protein contributes to a growth in muscle mass” · Muscles
  • “Protein contributes to the maintenance of muscle mass” · Muscles

Assessed by the register and not authorised

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