Essential oils are great for deodorant because they serve as an antimicrobial agent. Beyond that, since bacteria causes the smelly underarms, the scent of the essential oils help cover any microbes that tend to stay. The most popular essential oils for deodorant are lemon essential oil and lime essential oil. Lemon essential oil, according to studies, is actually one of the most potent antimicrobial agents. Lime essential oils, on the other hand have an exceptionally light yet relaxing scent. It is popular for deodorant as while it gives off a pleasing scent, it can also counter bacteria.