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The duration of vitamin B12 effectiveness depends on your health condition and the supplement type, and the severity of your deficiency

B12 deficiency is more common than widely recognized, particularly in individuals who follow plant-based diets, take proton pump inhibitors or metformin, are over 50, or have gastrointestinal conditions affecting absorption

In fact, the Cochrane Group concludes that: there is evidence of low quality that oral vitamin B12 or vitamin B12 administered intramuscularly have similar effects in normalizing vitamin B12 serum levels, but oral treatment costs less

This peptide functions by stopping the effects of Nicotinamide N-methyltransferase (NNMT)