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A deficiency can cause skin discoloration, changes in hair texture, and nail issues

Its own activity is sensitive to the cell's NAD+ and metabolic state

Vitamin B12 is distributed into the milk of nursing women in concentrations that approximate the maternal blood vitamin B12 concentration

Many people take B12 shots because they think it would give them more energy

Boosting Energy and Reducing Fatigue Some people may notice improved energy within days, although it can take a few weeks to feel the full benefits depending on the severity of the deficiency

guidance from healthcare professionals improves safety and ensures injections target appropriate muscle or subcutaneous tissue