I notice that several people are recommending l-arginine for FM. Since everyone's different, I thought I'd mention that after YEARS of remission my symptoms returned AS SOON AS I STARTED arginine supplementation. (My FM started initially after I first tried GH supplements.) I've stopped and the symptoms are subsiding -- but please beware. You know that body builders take GH to increase muscle performance. In the bargain, they increase lactic acid build-up, one of the culprits in FM. Some of you have mentioned cold sores and herpes; that's the GH at work, too, replicating the virus. Lysine will help in both cases, and I'm currently mega-dosing with that. But please, don't experiment with arginine unless you want to risk a flare up. I can't spend much time on message boards, but I sought this one out, hoping to help others avoid the mistake I made. Painless tomorrows to you all!