Aluminum Chloride

Aluminum chloride is a salt compound commonly used in antiperspirant and astringent formulations. It works by temporarily blocking sweat ducts, reducing the amount of perspiration that reaches the skin's surface. This ingredient has been used in topical skincare for decades, particularly in products designed to manage excess moisture.

In cosmetics, aluminum chloride typically appears in concentrations between 12% and 20% in antiperspirant products. It is distinct from other aluminium compounds used in skincare and operates primarily as a functional ingredient rather than a treatment for underlying skin conditions.

Aluminum chloride functions as an antiperspirant by forming a superficial plug within sweat ducts. When applied topically, it reacts with moisture and proteins in the sweat duct, creating a gel-like substance that temporarily obstructs sweat flow. This is a physical rather than a systemic effect—it does not alter the body's thermoregulation or affect sweat production at the gland itself.

The astringent properties arise from the same mechanism: the compound creates a slight tightening or drying sensation on the skin surface. This effect is temporary and localised to the area of application.

Aluminum chloride products are typically applied to clean, dry skin once or twice daily, depending on the formulation and individual need. For antiperspirant use, application in the evening before bed may enhance efficacy, as sweat production is lower overnight. Allow the product to dry fully before dressing. Discontinue use if irritation develops, and avoid application to broken or recently shaved skin, which may increase sensitivity.