The present invention concerns a tryptophan metabolite chosen from kynurenic acid, anthranilic acid, quinolinic acid, picolinic acid, quinaldic acid and the mixtures of same or an enantiomer, diastereoisomer, hydrate, solvate, tautomer, racemic mixture or pharmaceutically acceptable salt of same, for use as a drug intended for increasing and/or maintaining muscle mass and/or strength in a mammal, and in particular intended for treating and/or preventing muscle atrophy in mammals and/or for promoting muscle growth in mammals doing exercise and aiming to increase muscle mass and/or quality and/or strength, for preventing the appearance of symptoms of sarcopenia or for rehabilitation following muscle loss and/or for improving recovery time after an intense physical effort.
