Aluminum Chloride

What is Aluminum Chloride?

Aluminum chloride is a simple inorganic compound, the aluminum salt of hydrochloric acid, appearing as white crystals or powder soluble in water. In cosmetics, it primarily serves in underarm and body antiperspirant formulations, especially clinical-strength products targeting excessive sweating. It functions by reacting with sweat to form a gel-like plug of aluminum hydroxide within eccrine sweat gland ducts, temporarily narrowing openings and limiting perspiration flow. Additionally, its astringent properties contract skin proteins for a toned feel, while deodorant effects help manage odor through antibacterial action. Concentrations vary, with lower levels in consumer products and higher in targeted treatments, always applied to intact skin.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 3-5 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Antiperspirant
Reduces perspiration by temporarily plugging sweat ducts (commonly with aluminum salts), decreasing wetness in underarm and body antiperspirant products.
Astringent
Creates a temporary tightening and toning effect by contracting surface proteins, helping reduce the look of oiliness and refining feel on skin.
Deodorant agent
Targets malodor by neutralizing odor molecules, inhibiting odor-causing microbes, or adding fragrance notes to improve underarm and body freshness.
Deodorant
Helps control body odor by reducing odor-causing bacteria and/or neutralizing or masking malodor, without necessarily reducing sweat production.

Benefits

Helps minimize underarm wetness by restricting sweat gland output.

Provides a tightening effect to refine skin texture and reduce shine.

Assists in odor control by limiting bacterial growth in moist areas.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals experiencing moderate to heavy perspiration.
People with sensitive or irritated skin.
People seeking a toned, less oily skin appearance in targeted areas.
Individuals with open wounds or shaving cuts in application areas.
Those looking for combined sweat and odor management in body products.
Those with known allergies to aluminum compounds.

Safety Notes

  • Rated moderate concern by some databases due to potential skin reactions.
  • Apply only to dry, unbroken skin to minimize discomfort.

Frequently Asked Questions about Aluminum Chloride

What does aluminum chloride do in skincare?

It blocks sweat ducts to reduce perspiration, tightens skin, and helps control odor in antiperspirant products.

Is aluminum chloride safe for daily use?

Safe for most when used as directed on intact skin, but may irritate sensitive areas; check product instructions.

Can it cause skin irritation?

Possible mild to moderate irritation, especially at higher strengths or on sensitive skin.