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Vitamin B12 (Methylcobalamin): uses, side effects & brands
Vitamin B12 corrects B12 deficiency, which causes tiredness, anaemia and nerve symptoms. It belongs to the Vitamin & supplement group. Supplements correct deficiencies and support health when diet or absorption falls short.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Vitamin & supplement |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Vitamin B12 deficiency
- Anaemia caused by low B12
- Tingling or numbness from B12-related nerve damage
- Deficiency from long-term metformin or acid-reducing medicines, or a vegetarian diet
Common brand names
- India: Nurokind, Methylcobal, Neurobion Forte
- Worldwide: (cyanocobalamin/methylcobalamin brands)
Common side effects
- Mild nausea or stomach upset
- Headache
- Pain at the injection site (injections)
Before taking it — precautions
- The cause of the deficiency should be found, such as pernicious anaemia or gut problems
- Tell your doctor about Leber's eye disease (a rare inherited condition)
- Long-term use may be needed if the body cannot absorb B12
When to see a doctor urgently
- Swelling of face or throat or trouble breathing after an injection (urgent)
- Worsening numbness, weakness or memory problems
- Severe tiredness or breathlessness
Frequently asked questions
Is methylcobalamin better than other B12 forms?
Methylcobalamin and cyanocobalamin both correct deficiency; your doctor will choose based on availability and need.
Do vegetarians need B12?
B12 comes mainly from animal foods, so many vegetarians and vegans need supplements or fortified foods.
How long before nerve symptoms improve?
Tiredness may improve within weeks, but nerve symptoms can take months and may not fully recover if longstanding.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.