Supposedly Healthy Things That Aren't
With the first day's samples, researchers observed that antiperspirant users had fewer microbes and that deodorant users had more microbes, compared to those who did not use any product. As the study period progressed, the amount of bacteria in all participants was comparable.
"However, once all participants began using antiperspirant on days seven and eight, we found very few microbes on any of the participants, verifying that these products dramatically reduce microbial growth," study author Julie Horvath, head of the genomics and microbiology research laboratory at the NC Museum of Natural Sciences, an associate research professor at NC Central, said in a news release.
Researchers also studied the composition and variety of types of bacteria. Those who did not use any underarm product had cultures that contained 62 percent of the bacteria partially responsible for body odor smells- which are also thought to defend against pathogens and 21 percent Staphylococcaceae bacteria. Regular antiperspirant users' microbes were 60 percent Staphylococcaceae bacteria, the most common microbes found on human skin, most of which are considered beneficial and 14 percent odor-causing bacteria.