Aluminum chloride is found in antiperspirants as an active ingredient. It works by blocking sweat ducts, preventing sweat from reaching the skin's surface.

Here's why:

* Aluminum Chloride's Properties: Aluminum chloride is a salt that has a strong affinity for water. This property allows it to plug sweat ducts, thus reducing perspiration.

* Antiperspirant Formulation: Antiperspirants typically contain aluminum chloride in a concentration of 12-20%. The aluminum chloride is combined with other ingredients to create a product that is easy to apply and dries quickly.

While aluminum chloride is effective in reducing sweating, some people have concerns about its safety. The long-term effects of aluminum chloride on human health are not fully understood.

It's important to note that aluminum chloride is not found in deodorants, which only mask body odor and do not inhibit sweat production.