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During the first 4 weeks, you may notice mild appetite changes and early side effects like nausea, bloating, diarrhea, constipation, and gastrointestinal problems

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Key functions of vitamin B12 include: Supporting red blood cell production Enabling DNA synthesis and cell repair Protecting nerve health and the myelin sheath Supporting energy metabolism and mental clarity In simple words: Vitamin B12 helps your body turn food into usable energy and keeps your brain and nerves firing properly

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Also, be careful if you have megaloblastic anemia

This has been confirmed in multiple human studies