Vitamin B12
Essential for nerve function, DNA synthesis, and red blood cell formation. Indian vegetarians are at very high risk of deficiency as B12 is found almost exclusively in animal foods.
Pharmacists & Nutrition Researchers · Updated March 2026
500–2000 mcg
Dosage
morning
Timing
Strong
Evidence
2 cited
Studies
Benefits of Vitamin B12
Prevents megaloblastic anemia
Essential for nerve health and function
Supports energy metabolism
Required for DNA synthesis
May improve mood and cognitive function in deficient individuals
How Vitamin B12 Works
B12 (cobalamin) serves as a cofactor for methionine synthase (DNA methylation) and methylmalonyl-CoA mutase (energy metabolism). Deficiency leads to elevated homocysteine and methylmalonic acid, causing neurological damage.
Recommended Dosage
Methylcobalamin or hydroxocobalamin are preferred forms. Sublingual tablets bypass gut absorption issues. Only ~1.5% of oral dose is absorbed, so higher doses are needed. Vegetarians should supplement regardless of diet quality.
Who Should Avoid Vitamin B12
Key Research
Vitamin B12 deficiency in India (2018)
47% of North Indian adults were B12 deficient, rising to 70% among vegetarians
DOI: 10.1016/j.jcte.2017.11.003B12 supplementation and cognitive function (2018)
Supplementation improved memory in deficient older adults but not in those with normal levels
DOI: 10.1002/14651858.CD004326.pub4Recommended Vitamin B12 Brands in India
Carbamide Forte Vitamin B-Complex Tablets
Carbamide Forte
"Comprehensive B-complex including methylcobalamin B12 (active form) with good bioavailability and strong review count."
Carbamide Forte Vitamin B-Complex Tablets
Carbamide Forte
"Comprehensive B-complex including methylcobalamin B12 (active form) with good bioavailability and strong review count."
Products are selected based on quality, testing, and purity — not affiliate economics. See our selection criteria.
Works Well With
Frequently Asked Questions
What is Vitamin B12 used for?
Essential for nerve function, DNA synthesis, and red blood cell formation. Indian vegetarians are at very high risk of deficiency as B12 is found almost exclusively in animal foods.
What is the recommended dosage of Vitamin B12?
The clinically studied dosage range is 500–2000 mcg per day. Methylcobalamin or hydroxocobalamin are preferred forms. Sublingual tablets bypass gut absorption issues. Only ~1.5% of oral dose is absorbed, so higher doses are needed. Vegetarians should supplement regardless of diet quality.
When is the best time to take Vitamin B12?
Vitamin B12 is best taken in the morning. Methylcobalamin or hydroxocobalamin are preferred forms. Sublingual tablets bypass gut absorption issues. Only ~1.5% of oral dose is absorbed, so higher doses are needed. Vegetarians should supplement regardless of diet quality.
Is Vitamin B12 safe?
Vitamin B12 is generally considered safe at recommended dosages. However, it may be contraindicated for: Leber hereditary optic neuropathy (cyanocobalamin form), Cobalt allergy (very rare). Always consult a healthcare professional before starting any supplement.
Is Vitamin B12 vegetarian?
Vitamin B12 supplements are available in vegetarian form. Check the specific product label for capsule ingredients.
Can I take Vitamin B12 with other supplements?
Be aware of these interactions: Metformin reduces B12 absorption. Proton pump inhibitors reduce B12 absorption. Colchicine may reduce absorption
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