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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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Joints and Testosterone and Fertility and Bones

1323 capsules across 45 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.

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.

Fertility. Ingredients here hold register claims relating to fertility and reproduction, quoted exactly. UK guidance on folic acid before and during early pregnancy is the best-established nutritional advice in this area, and Fertility Network UK below offers wider support.

Bones. Ingredients here hold register claims relating to the maintenance of normal bones, quoted exactly on their pages. Weight-bearing exercise and dietary calcium are the foundations, and the Royal Osteoporosis Society is the specialist charity for anything further.

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 the maintenance of normal bones” · Bones

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

All 334 magnesium capsules

Vitamin C

2 authorised claims · 332 capsules · ingredient page
  • “Vitamin C contributes to normal collagen formation for the normal function of bones” · Bones
  • “Vitamin C contributes to normal collagen formation for the normal function of cartilage” · Joints

All 332 vitamin c capsules

Zinc

3 authorised claims · 249 capsules · ingredient page
  • “Zinc contributes to the maintenance of normal bones” · Bones
  • “Zinc contributes to normal fertility and reproduction” · Fertility
  • “Zinc contributes to the maintenance of normal testosterone levels in the blood” · Testosterone

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

All 249 zinc capsules

Vitamin D

3 authorised claims · 232 capsules · ingredient page
  • “Vitamin D contributes to the maintenance of normal bones” · Bones
  • “Vitamin D is needed for normal growth and development of bone in children.” · Bones
  • “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.” · Bones

All 232 vitamin d capsules

Folate

1 authorised claim · 138 capsules · ingredient page
  • “Folate contributes to maternal tissue growth during pregnancy” · Fertility

All 138 folate capsules

Vitamin K

1 authorised claim · 106 capsules · ingredient page
  • “Vitamin K contributes to the maintenance of normal bones” · Bones

All 106 vitamin k capsules

Calcium

3 authorised claims · 96 capsules · ingredient page
  • “Calcium helps to reduce the loss of bone mineral in post-menopausal women. Low bone mineral density is a risk factor for osteoporotic bone fractures” · Bones
  • “Calcium is needed for normal growth and development of bone in children.” · Bones
  • “Calcium is needed for the maintenance of normal bones” · Bones

All 96 calcium capsules

Selenium

1 authorised claim · 95 capsules · ingredient page
  • “Selenium contributes to normal spermatogenesis” · Fertility

All 95 selenium capsules

Copper

1 authorised claim · 58 capsules · ingredient page
  • “Copper contributes to maintenance of normal connective tissues” · Joints

All 58 copper capsules

Manganese

2 authorised claims · 32 capsules · ingredient page
  • “Manganese contributes to the maintenance of normal bones” · Bones
  • “Manganese contributes to the normal formation of connective tissue” · Joints

All 32 manganese capsules

Phosphorus

2 authorised claims · 3 capsules · ingredient page
  • “Phosphorus contributes to the maintenance of normal bones” · Bones
  • “Phosphorus is needed for the normal growth and development of bone in children” · Bones

Protein

2 authorised claims · 1 capsule · ingredient page
  • “Protein contributes to the maintenance of normal bones” · Bones
  • “Protein is needed for normal growth and development of bone in children.” · Bones

Assessed by the register and not authorised

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