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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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Blood and iron and Muscles

473 capsules across 32 ingredients

Blood and iron. Ingredients here hold register wording about normal red blood cell formation, oxygen transport, iron absorption or normal blood clotting, quoted exactly on their pages. Suspected iron deficiency needs a blood test before a supplement; the NHS page below explains why.

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

Not authorised for blood and iron: the register refused 1 claim there.

All 132 magnesium capsules

Vitamin C

1 authorised claim · 106 capsules · ingredient page
  • “Vitamin C increases iron absorption” · Blood and iron

All 106 vitamin c capsules

Vitamin D

2 authorised claims · 76 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 76 vitamin d capsules

Vitamin B6

1 authorised claim · 62 capsules · ingredient page
  • “Vitamin B6 contributes to normal red blood cell formation” · Blood and iron

All 62 vitamin b6 capsules

Folate

1 authorised claim · 57 capsules · ingredient page
  • “Folate contributes to normal blood formation” · Blood and iron

All 57 folate capsules

Vitamin B12

1 authorised claim · 51 capsules · ingredient page
  • “Vitamin B12 contributes to normal red blood cell formation” · Blood and iron

All 51 vitamin b12 capsules

Vitamin K

1 authorised claim · 39 capsules · ingredient page
  • “Vitamin K contributes to normal blood clotting” · Blood and iron

All 39 vitamin k capsules

Calcium

2 authorised claims · 28 capsules · ingredient page
  • “Calcium contributes to normal muscle function” · Muscles
  • “Calcium contributes to normal blood clotting” · Blood and iron

All 28 calcium capsules

Iron

2 authorised claims · 19 capsules · ingredient page
  • “Iron contributes to normal formation of red blood cells and haemoglobin” · Blood and iron
  • “Iron contributes to normal oxygen transport in the body” · Blood and iron

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

All 19 iron capsules

Potassium

1 authorised claim · 17 capsules · ingredient page
  • “Potassium contributes to normal muscle function” · Muscles

All 17 potassium capsules

Riboflavin

1 authorised claim · 17 capsules · ingredient page
  • “Riboflavin contributes to the maintenance of normal red blood cells” · Blood and iron

All 17 riboflavin capsules

Copper

1 authorised claim · 10 capsules · ingredient page
  • “Copper contributes to normal iron transport in the body” · Blood and iron

All 10 copper capsules

creatine

2 authorised claims · 10 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 10 creatine capsules

Assessed by the register and not authorised

The register looked at claims for these relating to blood and iron 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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