Curcumin compositions herein are described for improving muscle performance, endurance capacity and resistance to fatigue, when administered in effective amounts to a subject in need of such improvement. The compositions are comprised of curcumin and at least one pharmaceutically and/or nutraceutically acceptable excipient such as a hydrophilic carrier and exhibit enhanced bioavailability. More particularly methods are described and include use of curcumin compositions to increase exercise time, performance and capacity and to prevent muscle soreness, fatigue and injury. The compositions enhance mitochondrial biogenesis by modulating mitochondrial function, increasing mitochondrial mass and oxygen consumption, thus increasing mitochondrial aerobic capacity. The compositions reduce oxidative muscle stress, by decreasing inflammatory cytokines and inflammatory markers. Curcumin compositions are safe for consumption for pharmaceutical and/or nutraceutical purposes and are prepared by economic methods using conventional equipments and can be effectively used for enhancing muscle and exercise performance.
