Some athletes believe that the use of multiple B12 vitamins will result in increased fat metabolism, carbohydrate metabolism, and increased protein synthesis, and therefore the doses will greatly exceed the recommended doses
From supporting red blood cell formation and neurological function to DNA synthesis, this nutrient plays a vital role in maintaining good health
Some users report improved recovery and energy levels, though these effects are less well-documented than the body composition benefits
Conditions such as malnutrition, alcoholism, certain medical conditions (e.g., Crohns disease, celiac disease), or restrictive diets (e.g., veganism without adequate supplementation for *B12*) can lead to deficiencies in one or more of these crucial vitamins