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How Your Body Handles Vitamin B12 Your body needs to have a properly functioning pancreas, an unharmed stomach and intestines, and adequate levels of intrinsic factor, a protein that binds to vitamin B12 in the stomachonly then will you be able to absorb vitamin B12 as efficiently as possible

Diet: heavy alcohol use and certain nutrients can lower your B12, so you may notice effects fading sooner

The rate of fat loss depends on many factors including diet, exercise, starting body composition, and individual metabolic response to the compound

Without enough of it, a person may feel tired, weak, and just not all there mentally