Vitamin B12 is one of the B-vitamins, and performs important roles within the body, contributing towards normal immune system, nervous system and psychological function. Each tablet provides a massive 10000% NRV (Nutrient Reference Value) of Vitamin B12. DIRECTIONS: Take 1 tablet per day with a little water. INGREDIENTS: cyanocobalamin (vitamin b12) tabletted with dicalcium phosphate, cellulose, stearic acid, silica, magnesium stearate.