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Vitamin B12, a crucial nutrient for nerve function, blood cell production, and DNA synthesis, is often supplemented through injections, especially for those who struggle with its absorption or have certain dietary restrictions

Studies have shown that B-12 positively affects the brain, helping reduce stress and improve cognitive functioning

But, some studies show that males might see better results because of their higher muscle mass and metabolism

Both studies administered B12 i.m., one used methyl-B12 at a dose of 500 g three times per week for 2 weeks, 63 the other used cyano-B12, 1000 g daily for 2 weeks

doi: 10.2337/dc06-2375

Those allergic to vitamin B12 or cobalt should avoid them