Its naturally available from animal products, including fish, meat, poultry, eggs, milk, and milk products but its not usually present in plant foods
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US survey data from the NHANES What We Eat in America 2013e16 cohort reported the median vitamin B12 consumption for all adult men of 5.1 mcg and women of 3.5 mcg.95b Using the Estimated Average Requirement (EAR) for adults for Vitamin B12 of 2 mcg,93 less than 3% of men and 8% of women in the United States had inadequate diets using this comparator
Alternativamente, se pueden administrar 1000mcg diariamente SC/IM durante 2-7 das, seguido de tratamiento de mantenimiento
It does not suppress endogenous hormone production, does not require post-cycle therapy, and does not appear to have significant side effects at standard therapeutic doses