I take 2000 units a day of D along with a good multivitamin, and Omega 3-6-9 as well as Lutein-z. I have been taking this for over a year and it, along with a regular exercise program has made a 90% positive improvement to my life. I take the Lutein because the Fibro had really attacked my vision, this has helped it. 1-1/2 years ago I could not even walk slowly down the street with a cane, now I am on the treadmill for 30 minutes a day at 3.5 mph. I started very very slowly by walking in a mall that had benches where I could sit if needed. At first it was scary and difficult, but I persisted. Now I have stamina, endurance and surprise myself still when I run up a flight of stairs.
Apart from the D and the other supplements I found that I had to eat well, eat balanced meals and eat 3 snacks of nuts or fruit in between. I did a lot of research about correcting my sleep pattern, there is an improvement and have to say that this is the most persistent difficulty I have. I personally am convinced that our erratic and/or lack of sleep has a lot to do with the intensity of our problems. The days that I sleep a full 8 hours the night before are absolutely wonderful, but that only happens about 4 or 5 times a month, it is better than not happening at all.
Of all the things I tried over years of all sorts of attempts I have to say that the supplements and exercise along with the good nutrition is what has done the most good for me so far. I used to live on pain medicine, I haven't had to even take a Tylenol in over a year.
Just the supplements alone did not make much difference but they do along with the exercise and good food.