The present disclosure relates to a composition comprising a carnosine- magnesium complex. The composition is designed to be applied to the skin and causes an increase in carnosine levels in the body. The topical 5 composition comprising a carnosine-magnesium complex has the effect of improving an athlete's physical performance and may be effective for the treatment of a variety of medical conditions. Also disclosed is a method for preparing the carnosine-magnesium complex.