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Received October 2015
IDENTIFICATION A
12,13,14,17 Studies in elderly men (average age 75) have found an increased risk of cardiovascular problems in high IGF-1 groups (approximately 190 ng/ml)
Vitamin B12 Deficiency Causes of vitamin B12 deficiency include difficulty absorbing vitamin B12 from food, lack of intrinsic factor (e.g., because of pernicious anemia), surgery in the gastrointestinal tract, prolonged use of certain medications (e.g., metformin or proton pump inhibitors), and dietary deficiency
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