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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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Seller-stated only: vegan means the seller says vegan.

Metabolism and Focus and Muscles

1500 capsules across 61 ingredients

Metabolism. The register's phrase is 'contributes to normal energy-yielding metabolism', and many everyday vitamins and minerals hold it. It is not a claim about weight or about feeling energetic, which is why this goal sits apart from Weight and from Tiredness and fatigue. Wording is quoted exactly on each ingredient page.

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

2 authorised claims · 108 capsules · ingredient page
  • “Magnesium contributes to normal muscle function” · Muscles
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

Not authorised for metabolism: the register refused 2 claims there.

All 108 magnesium capsules

Vitamin C

1 authorised claim · 68 capsules · ingredient page
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism

All 68 vitamin c capsules

Vitamin D

2 authorised claims · 60 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

All 60 vitamin d capsules

Zinc

5 authorised claims · 53 capsules · ingredient page
  • “Zinc contributes to normal cognitive function” · Focus
  • “Zinc contributes to normal carbohydrate metabolism” · Metabolism
  • “Zinc contributes to normal macronutrient metabolism” · Metabolism
  • “Zinc contributes to normal metabolism of fatty acids” · Metabolism
  • and 1 more on the ingredient page

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

All 53 zinc capsules

Vitamin B6

3 authorised claims · 44 capsules · ingredient page
  • “Vitamin B6 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B6 contributes to normal homocysteine metabolism” · Metabolism
  • “Vitamin B6 contributes to normal protein and glycogen metabolism” · Metabolism

All 44 vitamin b6 capsules

Biotin

2 authorised claims · 38 capsules · ingredient page
  • “Biotin contributes to normal energy-yielding metabolism” · Metabolism
  • “Biotin contributes to normal macronutrient metabolism” · Metabolism

All 38 biotin capsules

Vitamin B12

2 authorised claims · 34 capsules · ingredient page
  • “Vitamin B12 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Metabolism

All 34 vitamin b12 capsules

Folate

1 authorised claim · 30 capsules · ingredient page
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

All 30 folate capsules

Calcium

2 authorised claims · 26 capsules · ingredient page
  • “Calcium contributes to normal muscle function” · Muscles
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism

Not authorised for focus or metabolism: the register refused 2 claims there.

All 26 calcium capsules

Chromium

1 authorised claim · 17 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

Not authorised for metabolism: the register refused 2 claims there.

All 17 chromium capsules

Iron

3 authorised claims · 17 capsules · ingredient page
  • “Iron contributes to normal cognitive function” · Focus
  • “Iron contributes to normal cognitive development of children” · Focus
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism

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

All 17 iron capsules

Copper

1 authorised claim · 13 capsules · ingredient page
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism

All 13 copper capsules

creatine

2 authorised claims · 13 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 13 creatine capsules

Potassium

1 authorised claim · 13 capsules · ingredient page
  • “Potassium contributes to normal muscle function” · Muscles

All 13 potassium capsules

Riboflavin

2 authorised claims · 11 capsules · ingredient page
  • “Riboflavin contributes to normal energy-yielding metabolism” · Metabolism
  • “Riboflavin contributes to the normal metabolism of iron” · Metabolism

All 11 riboflavin capsules

Niacin

1 authorised claim · 10 capsules · ingredient page
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

All 10 niacin capsules

Choline

2 authorised claims · 9 capsules · ingredient page
  • “Choline contributes to normal homocysteine metabolism” · Metabolism
  • “Choline contributes to normal lipid metabolism” · Metabolism

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

All 9 choline capsules

Vitamin A

1 authorised claim · 9 capsules · ingredient page
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

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

All 9 vitamin a capsules

Iodine

2 authorised claims · 8 capsules · ingredient page
  • “Iodine contributes to normal cognitive function” · Focus
  • “Iodine contributes to normal energy-yielding metabolism” · Metabolism

All 8 iodine capsules

Manganese

1 authorised claim · 6 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism

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

All 6 manganese capsules

Pantothenic Acid

3 authorised claims · 6 capsules · ingredient page
  • “Pantothenic acid contributes to normal mental performance” · Focus
  • “Pantothenic acid contributes to normal energy-yielding metabolism” · Metabolism
  • “Pantothenic acid contributes to normal synthesis and metabolism of steroid hormones, vitamin D and some neurotransmitters” · Metabolism

All 6 pantothenic acid capsules

Molybdenum

1 authorised claim · 4 capsules · ingredient page
  • “Molybdenum contributes to normal sulphur amino acid metabolism” · Metabolism

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

All 4 molybdenum 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 metabolism 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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