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Vitamin B 12

Vitamin B12 tablets for preventing and treating deficiency.

Clinical information

Common uses

  • preventing and treating vitamin B12 deficiency
  • injections may be needed first to boost levels

Cautions

  • contains cobalt — allergic reactions possible in cobalt allergy
  • regular blood tests may monitor B12 levels

Interactions

  • metformin (reduces B12 absorption)
  • antacids such as Gaviscon
  • H2 blockers (famotidine, cimetidine)
  • proton pump inhibitors (omeprazole, lansoprazole)

Pregnancy: safe to take in pregnancy

Reference information, not medical advice — always follow your doctor or pharmacist. Source: NHS Medicines A–Z, nhs.uk/medicines/cyanocobalamin (accessed 2026-08-16)

Approved brands & formulations2

Brand nameDosage formStrengthImporterCategory
CytaconOral Liquid35 mcg/ 5 mlauthorized medicine importersOTC
CytamenParenteral ( Injection )1000mcg/mlauthorized medicine importersPOM
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