My Vitamin D is low too and I am taking 5 weeks worth of 50,000U for the 2nd time now. I also now have osteoporosis at 56. what a bummer, and I tried to eat really good too,and took calcium and exercised. It must be genetic. Mom had osteo too. I think I might have read that there is some kind of Vit D and Pd connection, like we have more deficiency than the average,or something like that Anyway YES, everybody needs to get it checked. Thanks for bringing up the topic FG