Aluminum Sesquichlorohydrate

What is Aluminum Sesquichlorohydrate?

Aluminum Sesquichlorohydrate is a water-soluble inorganic complex of aluminum, chloride ions, and hydroxide groups, typically produced through controlled reactions of aluminum compounds. Primarily featured in underarm deodorant and antiperspirant formulations such as roll-ons, sticks, and sprays, it functions by dissolving in the moisture on the skin's surface. There, it hydrolyzes to create a viscous gel that forms temporary, superficial plugs within the openings of eccrine sweat glands. These plugs limit sweat flow to the skin without deep penetration, offering prolonged moisture control. Its astringent nature also contracts surface skin proteins for a smoother, less oily appearance, while antimicrobial action curbs bacteria that produce odor. The ingredient integrates seamlessly into clear or translucent products due to its lack of color and scent.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 1-3 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 output.

Neutralizes odor through bacterial inhibition and astringency.

Tightens skin surface for a refined, matte texture.

Who It's For

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

Who May Benefit	Who Should Avoid
People experiencing noticeable underarm perspiration.	Those with known sensitivity to aluminum compounds.
Individuals seeking combined sweat and odor management.	People with irritated, shaved, or broken underarm skin.
Users desiring a temporary toning effect on oily areas.	Individuals prone to allergic contact dermatitis.

Safety Notes

Regulatory bodies deem it suitable for use in antiperspirant products at typical levels.
Minimized skin penetration occurs due to its localized, temporary action.

Frequently Asked Questions about Aluminum Sesquichlorohydrate

What does Aluminum Sesquichlorohydrate do in products?

It forms gel-like plugs in sweat ducts to curb perspiration, controls odor via antibacterial effects, and tightens skin.

Is it suitable for daily antiperspirant use?

Yes, it's commonly used in such products and considered appropriate for regular application by cosmetic safety experts.

Does it affect pore clogging?

Rated non-comedogenic, it does not promote acne or block pores.