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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 Immunity and Stress and Muscles

1490 capsules across 70 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.

Immunity. This page gathers ingredients whose GB register claims relate to the normal function of the immune system, with the exact authorised wording quoted on each ingredient page. Anything not authorised may not be claimed by sellers, and we quote that status too. A balanced diet, sleep and vaccination advice from the NHS come before any capsule.

Stress. Very few ingredients hold authorised register claims in this area, and this page is honest about that: the split below shows what may be said and what may not. Ingredients people discuss for stress appear with their register status, and Mind's resources cover support that goes beyond nutrition.

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

Not authorised for immunity or stress: the register refused 3 claims there.

All 334 magnesium capsules

Vitamin C

3 authorised claims · 332 capsules · ingredient page
  • “Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise” · Immunity
  • “Vitamin C contributes to the normal function of the immune system” · Immunity
  • “Vitamin C contributes to normal collagen formation for the normal function of cartilage” · Joints

All 332 vitamin c capsules

Zinc

1 authorised claim · 249 capsules · ingredient page
  • “Zinc contributes to the normal function of the immune system” · Immunity

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

All 249 zinc capsules

Vitamin D

4 authorised claims · 232 capsules · ingredient page
  • “Vitamin D contributes to the normal function of the immune system” · Immunity
  • “Vitamin D contributes to the normal function of the immune system in children.” · Immunity
  • “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 232 vitamin d capsules

Vitamin B6

1 authorised claim · 185 capsules · ingredient page
  • “Vitamin B6 contributes to the normal function of the immune system” · Immunity

All 185 vitamin b6 capsules

Vitamin B12

1 authorised claim · 163 capsules · ingredient page
  • “Vitamin B12 contributes to the normal function of the immune system” · Immunity

All 163 vitamin b12 capsules

Folate

1 authorised claim · 138 capsules · ingredient page
  • “Folate contributes to the normal function of the immune system” · Immunity

All 138 folate capsules

Calcium

1 authorised claim · 96 capsules · ingredient page
  • “Calcium contributes to normal muscle function” · Muscles

All 96 calcium capsules

Selenium

1 authorised claim · 95 capsules · ingredient page
  • “Selenium contributes to the normal function of the immune system” · Immunity

All 95 selenium capsules

Iron

1 authorised claim · 87 capsules · ingredient page
  • “Iron contributes to the normal function of the immune system” · Immunity

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

All 87 iron capsules

Copper

2 authorised claims · 58 capsules · ingredient page
  • “Copper contributes to the normal function of the immune system” · Immunity
  • “Copper contributes to maintenance of normal connective tissues” · Joints

All 58 copper capsules

Vitamin A

1 authorised claim · 54 capsules · ingredient page
  • “Vitamin A contributes to the normal function of the immune system” · Immunity

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

All 54 vitamin a capsules

Manganese

1 authorised claim · 32 capsules · ingredient page
  • “Manganese contributes to the normal formation of connective tissue” · Joints

All 32 manganese capsules

Potassium

1 authorised claim · 32 capsules · ingredient page
  • “Potassium contributes to normal muscle function” · Muscles

All 32 potassium capsules

creatine

2 authorised claims · 20 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.

All 20 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 joints and immunity and stress 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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