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B12 is a water soluble vitamin and when given in the injection formula, it usually last a week versus a pill or liquid form that only last a few hours

Because vitamin B12 is found primarily in animal products, people who follow vegetarian or vegan diets are at increased risk of deficiency, says Lauren Manaker, a registered dietitian and owner of Nutrition Now Counseling

How it exactly works in the body is not fully understood

(4) Prasad S, Tyagi AK, Aggarwal BB
