Possible side effects include: Nausea, diarrhea, vomiting, constipation, mild to moderate abdominal pain, headache, fatigue, dyspepsia, dizziness, abdominal distension, belching, hypoglycemia, flatulence, gastroenteritis, loss of lean muscle mass and gastroesophageal reflux disease
Age As individuals age, the body's ability to absorb vitamin B12 declines
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However, many people can neither absorb nor use B12 because of issues in the complex absorption and metabolism of B12