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These may include: Fatigue Brain fog Memory loss Neurological problems Heart palpitations Pale skin Muscle weakness Mood changes Appetite loss Constipation Infertility Side Effects of Vitamin B12 While the recommended daily amount of vitamin B12 for adults is 2.4 micrograms, higher doses have been found to be safe

For patients who could achieve the same results with oral supplementation, the cost difference is substantial and worth discussing with your provider

Regardless of which option you choose, youll typically inject yourself once every one to two weeks as per your doctors directions

Initial research tested doses as low as 250mcg and as high as 1mg daily