Drugs may cause B-12 deficiency
I am a diabetic, and I'm afraid I'm missing something in my diet. My hair is rapidly falling out, and my nails refuse to grow. They just split, despite nightly moisturizing. I eat carefully, but I take a lot of medicines: insulin and metformin for diabetes, atenolol and HCTZ for blood pressure, lovastatin for cholesterol and Prilosec for reflux. Could any of them be contributing to this problem?
You might be deficient in vitamin B-12. Although hair loss is not the most serious sign of vitamin B-12 deficiency, it is one possible result. Your diabetes medicine metformin (found in Actoplus Met, Avandamet, Glucophage, Glucovance) and your reflux drug omeprazole (Prilosec) could both contribute to lower levels of vitamin B-12. 
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