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Clinical studies show that B12 injections have no major side effects, though rare cases of sensitivity may occur [20]
Upon taking a history, the woman, who had not suffered from acne before, had recently received 3 weekly injections of vitamin B12, administered privately by a nurse in a local beauty salon without any screening for vitamin B12 deficiency
Fast Heart Rate People with a B12 insufficiency or deficiency lack enough healthy red blood cells
Important things to keep in mind include: Serum B12 levels should be normal for most people Methylmalonic acid (MMA) and homocysteine levels can show if B12 is really working, even if levels seem fine How symptoms change is also important When and How to Adjust Dosing Regimens Doctors might need to change the dose based on test results and how the patient is doing