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Deficiency of vitamin B12 may cause tiredness, weakness, constipation, loss of appetite, weight loss and megaloblastic anemia (a condition when red blood cells become larger in size than normal)
Display borderline insulin resistance or early metabolic syndrome
People with Digestive Disorders: Conditions like Crohns disease, celiac disease, or those who have undergone weight loss surgery can impair the absorption of B12
Most practitioners recommend starting at 250-300 mcg daily to assess tolerance, then potentially increasing to 400-500 mcg if initial response is suboptimal and no side effects occur
Recent surgery
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