What are the active ingredients in most deodorants?

Deodorant contains antimicrobial ingredients to prevent bacterial odors and aluminum salts to eliminate underarm wetness. Antimicrobial agents, such as triclosan, kill the bacteria on the skin, according to AntiperspirantsInfo. Aluminum salts, including aluminum zirconium tetrachlorohydrex GLY and aluminum chlorohydrate, clog sweat glands to help prevent perspiration.

The base of the deodorant can be either alcohol or cyclomethicone. Talc, or magnesium silicate, absorbs underarm odors. Baking soda helps neutralize odors and absorb wetness. Essential oils and perfumes provide fragrance to help cover body odor. Hops and witch hazel are often included in natural formulas. The hops help halt bacterial growth on the skin, while the witch hazel helps minimize pore size and absorb the body's natural oils.