What active ingredient is commonly found in anti-perspirants?

The active ingredient commonly found in anti-perspirants is aluminium salts. These compounds work by temporarily blocking the sweat glands, reducing the amount of perspiration that reaches the surface of the skin. When applied, aluminium salts interact with the skin and form a gel-like substance that plugs the ducts of the sweat glands, thus effectively minimizing sweat production.

In contrast, while antiseptics, fragrances, and alcohol may be included for other purposes, they do not serve the primary function of sweat reduction provided by aluminium salts. Antiseptics help prevent bacterial growth and thus control odor, but they do not influence sweat production. Fragrance is primarily added for scent without affecting perspiration levels. Alcohol can act as a solvent or for its antiseptic properties, but it also does not reduce sweating directly. Therefore, aluminium salts are the essential component that differentiates anti-perspirants from regular deodorants, which primarily mask odor without preventing sweat.