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Functional vitamin B12 deficiency Some people can experience problems related to a vitamin B12 deficiency, despite appearing to have normal levels of vitamin B12 in their blood

Ingredient amounts, added vitamins, and preparation methods can vary widely across providers

Why do I constantly feel tired and have a metallic taste in my mouth

A healthcare provider injects a concentrated form of vitamin B12 into the muscle, bypassing the need for absorption through the digestive system

Research has shown that methylcobalamin is more efficiently used and retained in the body than the cyanocobalamin form