Folic Acid & Biotin
I accidentally bought this vitamin bottle called B-100 Complex instead of the regular B-Complex and noticed a HUGE change in how I feel when I take it. What I noticed was that there was 800 mcg of Folic Acid in it as well as 1000 mcg of Biotin.
I always keep a close eye on my symptoms and could definitely say that Folic Acid and Biotin are helping my muscles (they burn less, they feel more stabilized, etc)
I know Fibromyalgia is very complex and unique with everyone, but these two supplements are definitely something you should try if you want to find more ways to stabilize your pain naturally.