Aloe verahas been used from time immemorial for the treatment of a multitude of ailments ranging from peptic ulcers to its use in cosmetics. It has a well-established antimicrobial activity ascribed to compounds that are now specifically identified as p-coumaric acid, ascorbic acid, pyrocatechol and cinnamic acid.

Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3410334/