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Similarly, a meta-analysis of nine observational studies in older adults found low serum vitamin B 12 concentration to be associated with increased risk for depression, with significant association only in women (100)

Regular B12 injections on their own may increase your energy levels, but will do little to aid in weight loss

However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing

The deficiency of vitamin B12 can begin mildly and progress to severe side effects, impairing brain and nerve function