ibromyalgia
"I took this to help with the endless, debilitating fatigue I have from fibromyalgia. It didn't relieve my physical or mental fatigue at all but it did keep me awake until three in the morning (I took it about 11 am). I felt jittery and feverish (no actual fever, though). It kept me going all day but I still had the heavy, uncomfortable feelings of physical and mental fatigue. "