A hand sanitizer, also known as a healthcare personnel hand wash, Hand alcohol or a hand antiseptic according to the latest FDA definition, is used as a supplement or alternative to hand washing with soap and water. The active ingredient in hand sanitizers may be isopropanol, ethanol, or (in Europe) n-propanol. A variety of preparations are available, including gel, foam, and liquid solutions. Hand sanitizers containing alcohol are more effective at killing germs than soaps and do not dry out hands as much as soaps. Inactive ingredients in alcohol rubs typically include a thickening agent such as carbomer (a trade name for polyacrylic acid) for alcohol gels, humectants such as glycerin for liquid rubs, propylene glycol, and essential oils of plants. Popular alcohol rub brands include Baccide, Purell, Germ-X, Aqium, Avant, GermOut, and Aquawet. Lysol, and Method Products also produce popular alcohol-based hand sanitizers.