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RELATED The Bottom Line Your body needs vitamin B12 to create red blood cells and DNA, and to keep your brain and nervous system in top shape
High doses too frequently may lead to rare side effects like low potassium or vascular stress

Allow 2-4 weeks at each new dose to assess response before further adjustment

So, for a 1000 mcg dose, you give 1 mL of the solution

Six controlled trials in approximately 900 participants are summarized in Stier et al