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However I believe that there is not really any fool proof blood test

Vegans and vegetarians often struggle to get enough B12 through food alone, but regular injections can bridge that gap safely and effectively

B12 Missing from Vegan and Vegetarian Diets Scientists surmise that plant-eating humans once got adequate amounts of cobalamin from small amounts of dirt found on the surface of plants, in much the same way that plant-eating animals like cattle acquire the nutrient

Prefilled injections of Methylcobalamin B12 delivered with 30 or more single-use 1" SQ syringes require a valid doctor's prescription
