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5 Conclusion This systematic review and meta-analysis indicate that sublingual and oral vitamin B12 administration provide efficacy comparable to intramuscular injection in improving serum cobalamin levels and reducing hyperhomocysteinaemia
Its considered the most versatile of all vitamins due to its vast range of abilities, including influencing fundamental nerve functions, processing carbs and fats, forming red blood cells, and producing DNA
[56] [57] Low levels of serum vitamin B 12 may be caused by other factors than B 12 deficiency, such as folate deficiency, pregnancy, oral contraceptive use, haptocorrin deficiency, and myeloma
Most people get enough vitamin B12 in their diet, but some need supplementation