How long does it take for Vitamin B12 pills to work? They're 1000 mcg. Wednesday was a week.

Why take B12? Vitamin B12 pills aren't going to do a thing for you unless you are actually deficient as demonstrated by labwork, and if you are, the situation is extremely serious and you need to be under the care of a physician. Please forgive my frankness, and pardon me if I have misunderstood.