A method of treating a mammal to promote wound healing in the mammal in need thereof, comprising orally administering to the mammal an effective amount of a palatable, concentrated protein composition comprising an effective amount of hydrolyzed gelatin and tryptophan, and an ingestible carrier, the composition comprising the essential amino acids required by the mammal. Palatability is preferably achieved by the use of an effective amount of a sweetener. The method is particularly useful for treating wounds resulting from decubitus ulcers and bariatric surgery.