Vitamin & Mineral · Vitamin
Vitamin B12 (Cyanocobalamin)
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Vitamin B12 (cyanocobalamin) is an essential water-soluble vitamin that serves as a cofactor for methionine synthase and methylmalonyl-CoA mutase enzymes. It supports DNA synthesis, red blood cell formation, and myelin sheath maintenance for proper neurological function.
Vitamin B12, or cyanocobalamin, is a water-soluble vitamin found in animal products such as meat, dairy, and eggs. It is essential for red blood cell formation and neurological function.
Research supports the role of Vitamin B12 in energy production and anemia prevention. Cyanocobalamin is the most common and stable form used in supplements.
Typical dosage ranges from 2.4 to 1000 mcg daily, depending on individual needs. Consult a healthcare provider before use.
- Recommended daily intake: 2.4 mcg for adults. - Found in fortified foods and dietary supplements.
Cyanocobalamin converts to methylcobalamin and adenosylcobalamin, the active coenzyme forms. Methylcobalamin activates methionine synthase for homocysteine metabolism and DNA methylation. Adenosylcobalamin enables methylmalonyl-CoA mutase to convert methylmalonyl-CoA to succinyl-CoA in fatty acid metabolism.
Randomized controlled trials demonstrate that B12 supplementation (1000-2000 mcg daily) effectively treats deficiency-related anemia and neuropathy within 8-12 weeks. A 2019 systematic review of 18 studies found significant improvements in neurological symptoms among deficient patients. However, evidence for cognitive benefits in non-deficient populations remains limited. Most studies focus on deficiency correction rather than enhancement in healthy individuals.
Vitamin B12 is generally safe with no established upper intake limit due to low toxicity. High doses may interfere with folate metabolism and mask folate deficiency symptoms. Metformin, proton pump inhibitors, and H2 blockers can reduce B12 absorption. Pregnancy and breastfeeding safety is established at recommended doses of 2.6-2.8 mcg daily.
4 documented interactions for Vitamin B12 (Cyanocobalamin). Click any row to read the full explanation. Always consult your healthcare provider before combining supplements with medications.
Metformin can cause B12 deficiency over time. Supplement B12 and get levels checked annually.
What to do: The interaction between Vitamin B12 and Metformin is manageable with awareness. Talk to your doctor or pharmacist, especially if you notice any new or unusual symptoms after combining them.
Timing: Take Metformin with meals as prescribed. Vitamin B12 with food (fat-containing for A, D, E, K). Vitamin D deficiency is linked to insulin resistance — optimizing D levels may support diabetes management. B vitamins support nerve health, which is relevant for diabetic neuropathy prevention.
Full interaction details →Long-term Nexium use can cause B12 deficiency.
What to do: Long-term use of Vitamin B12 with Esomeprazole may affect nutrient absorption over time. Consider periodic blood work to check key nutrient levels, and discuss supplementation with your doctor if needed.
Timing: Take Esomeprazole 30 minutes before a meal — PPIs must be activated by acid pumps that turn on when you eat. Vitamin B12 can be taken with the meal or at a separate time. PPIs impair vitamin B12 absorption (requires acid). Consider sublingual B12 or B12 injections for long-term PPI users. Fat-soluble vitamin absorption may also be mildly affected.
Full interaction details →Long-term Protonix use can cause B12 deficiency. Consider supplementation.
What to do: Long-term use of Vitamin B12 with Pantoprazole may affect nutrient absorption over time. Consider periodic blood work to check key nutrient levels, and discuss supplementation with your doctor if needed.
Timing: Take Pantoprazole 30 minutes before a meal — PPIs must be activated by acid pumps that turn on when you eat. Vitamin B12 can be taken with the meal or at a separate time. PPIs impair vitamin B12 absorption (requires acid). Consider sublingual B12 or B12 injections for long-term PPI users. Fat-soluble vitamin absorption may also be mildly affected.
Full interaction details →Prilosec reduces acid needed to absorb B12. Long-term PPI users may need B12 supplements.
What to do: Long-term use of Vitamin B12 with Omeprazole may affect nutrient absorption over time. Consider periodic blood work to check key nutrient levels, and discuss supplementation with your doctor if needed.
Timing: Take Omeprazole 30 minutes before a meal — PPIs must be activated by acid pumps that turn on when you eat. Vitamin B12 can be taken with the meal or at a separate time. PPIs impair vitamin B12 absorption (requires acid). Consider sublingual B12 or B12 injections for long-term PPI users. Fat-soluble vitamin absorption may also be mildly affected.
Full interaction details →Educational information only. Always consult a qualified healthcare provider before changing your supplement or medication regimen.
