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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.

  • None yet. Type an ingredient in the box above, for example “magnesium” or “turmeric”.

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

Joints and Metabolism and Testosterone

1275 capsules across 50 ingredients

Joints. Joints carry the largest set of refused claims in the register: glucosamine, chondroitin, MSM, turmeric and collagen-for-joints wording were all assessed and turned down. What is authorised is narrow and quoted exactly on the ingredient pages: vitamin C for normal collagen formation for the normal function of cartilage, and manganese for normal formation of connective tissue. Versus Arthritis is the specialist charity for anything beyond nutrition.

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.

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.

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 · 257 capsules · ingredient page
  • “Magnesium contributes to normal energy-yielding metabolism” · Metabolism

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

All 257 magnesium capsules

Vitamin C

2 authorised claims · 238 capsules · ingredient page
  • “Vitamin C contributes to normal collagen formation for the normal function of cartilage” · Joints
  • “Vitamin C contributes to normal energy-yielding metabolism” · Metabolism

All 238 vitamin c capsules

Zinc

5 authorised claims · 184 capsules · ingredient page
  • “Zinc contributes to the maintenance of normal testosterone levels in the blood” · Testosterone
  • “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 joints: the register refused 1 claim there.

All 184 zinc capsules

Vitamin B6

3 authorised claims · 144 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 144 vitamin b6 capsules

Vitamin B12

2 authorised claims · 123 capsules · ingredient page
  • “Vitamin B12 contributes to normal energy-yielding metabolism” · Metabolism
  • “Vitamin B12 contributes to normal homocysteine metabolism” · Metabolism

All 123 vitamin b12 capsules

Folate

1 authorised claim · 104 capsules · ingredient page
  • “Folate contributes to normal homocysteine metabolism” · Metabolism

All 104 folate capsules

Biotin

2 authorised claims · 94 capsules · ingredient page
  • “Biotin contributes to normal energy-yielding metabolism” · Metabolism
  • “Biotin contributes to normal macronutrient metabolism” · Metabolism

All 94 biotin capsules

Calcium

1 authorised claim · 76 capsules · ingredient page
  • “Calcium contributes to normal energy-yielding metabolism” · Metabolism

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

All 76 calcium capsules

Iron

1 authorised claim · 60 capsules · ingredient page
  • “Iron contributes to normal energy-yielding metabolism” · Metabolism

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

All 60 iron capsules

Chromium

1 authorised claim · 53 capsules · ingredient page
  • “Chromium contributes to normal macronutrient metabolism” · Metabolism

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

All 53 chromium capsules

Copper

2 authorised claims · 42 capsules · ingredient page
  • “Copper contributes to maintenance of normal connective tissues” · Joints
  • “Copper contributes to normal energy-yielding metabolism” · Metabolism

All 42 copper capsules

Vitamin A

1 authorised claim · 40 capsules · ingredient page
  • “Vitamin A contributes to normal iron metabolism” · Metabolism

All 40 vitamin a capsules

Iodine

1 authorised claim · 38 capsules · ingredient page
  • “Iodine contributes to normal energy-yielding metabolism” · Metabolism

All 38 iodine capsules

Niacin

1 authorised claim · 38 capsules · ingredient page
  • “Niacin contributes to normal energy-yielding metabolism” · Metabolism

All 38 niacin capsules

Choline

2 authorised claims · 36 capsules · ingredient page
  • “Choline contributes to normal homocysteine metabolism” · Metabolism
  • “Choline contributes to normal lipid metabolism” · Metabolism

All 36 choline capsules

Riboflavin

2 authorised claims · 29 capsules · ingredient page
  • “Riboflavin contributes to normal energy-yielding metabolism” · Metabolism
  • “Riboflavin contributes to the normal metabolism of iron” · Metabolism

All 29 riboflavin capsules

Manganese

2 authorised claims · 28 capsules · ingredient page
  • “Manganese contributes to normal energy-yielding metabolism” · Metabolism
  • “Manganese contributes to the normal formation of connective tissue” · Joints

All 28 manganese capsules

Pantothenic Acid

2 authorised claims · 28 capsules · ingredient page
  • “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 28 pantothenic acid capsules

Molybdenum

1 authorised claim · 12 capsules · ingredient page
  • “Molybdenum contributes to normal sulphur amino acid metabolism” · Metabolism

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

All 12 molybdenum capsules

Thiamine

1 authorised claim · 3 capsules · ingredient page
  • “Thiamine contributes to normal energy-yielding metabolism” · Metabolism

Betaine

1 authorised claim · 2 capsules · ingredient page
  • “Betaine contributes to normal homocysteine metabolism” · Metabolism

Phosphorus

1 authorised claim · 2 capsules · ingredient page
  • “Phosphorus contributes to normal energy-yielding metabolism” · Metabolism

Assessed by the register and not authorised

The register looked at claims for these relating to joints and metabolism and testosterone 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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