Hi ~ I have had fibro for 10 years and have had pain level at 8/9 for over 18 months (which was documented in a Stanford study). I have never taken vitamins and am still not an advocate of "vitamins". To make a long story...short, after my normal 6 month blood work my primary doctor mentioned that maybe I should take 1000 mg. of Vit. D for my bones. "By chance (?)" Within 2 weeks my pain went from 8/9 to about a 2. Today it was about 1. First time in 10 years. I let him know and he did a Vit. D test. I was low. He has put me on 2000 mg for 2 months and then back on the 1000. Just in case this might help someone...I am passing it on. It is sure worth a try.