Many microorganisms are present in the human intestines and skin, and are classified according to those that contribute to health and diseases. Therefore, the selective suppression of the growth of microorganisms involved in diseases and unpleasant odors may result in the establishment of a good symbiotic relationship between microorganisms and humans. 1 Axillary odor is caused by the metabolism of secretions from the apocrine glands of the axilla into volatile substances by indigenous bacteria on the skin. 2 Short and medium-chain volatile fatty acids, 16-androstene steroids, and thioalcohols produced by the genus Corynebacterium are the primary causal agents of odors, and the biotransformation of them by other gram-positive bacteria of the genera such as Staphylococcus, Micrococcus, Corynebacterium, and Propionibacterium causes unpleasant odors. 3 Furthermore, previous