For athletes, finding a way to deal with muscle soreness would be a huge boost to performance. In one small study of 8 healthy young men, results showed that supplementing with either 1 or 2 grams of L-carnitine beneficially affected markers of post-exercise metabolic stress and muscle damage. For a period of three weeks, participants received either 0, 1 or 2 grams of L-carnitine. At the end of the three weeks, they performed a set of resistance exercises. Both the 1 and 2 gram dosages reduced markers for post-exercise metabolic stress in the blood and perceived muscle soreness.