Disclosed is a method for evaluating the ability of a chemical substance or a chemical composition to prevent muscle fatigue and damage induced by physical exertion in humans; edible composition including at least one salt of a multivalent metal cation, at least one compound selected between vitamin E or vitamin E acetate, at least one edible polyphenol compound selected from compounds of the flavonol family, compounds of the anthocyanin family, compounds of the phenolic acid family and compounds of the flavonol family and/or the glucosylated derivatives thereof, in which the molar ratio/is of at least 0.50 and not more than 2.00; its use as a food supplement or for preparing a food supplement composition or as a drug for preventing muscle fatigue and/or muscle damage induced by physical exertion, in a method for the treatment of the human body by therapy.