What Is Aluminum Sesquichlorohydrex Peg?
Aluminum Sesquichlorohydrex Peg is a synthetic complex made by reacting aluminum chloride hydroxide with polyethylene glycol. Chemically it belongs to the family of aluminum salts that carry both chloride and hydroxide groups, giving it the ability to bind water and interact with skin proteins. The “Peg” part indicates that the molecule is tethered to polyethylene glycol chains, which help keep the ingredient stable and easy to disperse in water-based formulas.
Aluminum salts have been used in personal care since the early 1900s for their sweat-controlling properties. Over time formulators sought versions that were less irritating yet still effective. The Peg-linked form arrived in the 1990s as a more modern option that offers good performance while rinsing off easily, reducing residue on skin and fabrics.
Production starts with purified aluminum chloride and aluminum hydroxide, which are reacted in carefully controlled conditions to create a sesquichlorohydrate complex. Polyethylene glycol is then added so the final material forms a smooth aqueous solution rather than a gritty powder. Filtration and quality checks follow before the ingredient is shipped to cosmetic manufacturers.
You will most often find Aluminum Sesquichlorohydrex Peg in roll-on or stick antiperspirants, aerosol deodorant sprays, clinical-strength sweat control creams, and occasional body lotions aimed at reducing moisture in areas like feet or underarms.
Aluminum Sesquichlorohydrex Peg’s Cosmetic Benefits/Uses
This ingredient pulls double duty for sweat and odor control while offering a mild tightening feel on the skin.
- Antiperspirant: The aluminum ions form temporary plugs inside sweat ducts which slow down the flow of perspiration. Less sweat means drier underarms and clothing
- Astringent: By causing light contraction of surface proteins it leaves skin feeling firmer and less greasy, which can be helpful in body care products aimed at freshening or mattifying
- Deodorant: Reducing sweat also limits the moisture bacteria need to produce odor, and the aluminum salts lower skin pH to make it less welcoming to odor-causing microbes
Who Can Use Aluminum Sesquichlorohydrex Peg
Most skin types can tolerate Aluminum Sesquichlorohydrex Peg. It is especially suitable for normal to oily skin because its astringent action helps reduce excess moisture. Dry skin can also use it, but those with very sensitive or compromised skin may notice a slight sting or tightness, particularly if applied after shaving or on irritated areas.
The ingredient is synthetic and mineral based with no animal derived components, so it is generally considered suitable for vegans and vegetarians. Always check the full product label to be certain no other animal sourced ingredients are included.
No specific restrictions exist for pregnant or breastfeeding women when it is used topically in over-the-counter personal care products. Current research shows minimal systemic absorption. This is not medical advice, and anyone who is pregnant or nursing should confirm product use with a healthcare professional to be safe.
Aluminum Sesquichlorohydrex Peg does not increase sensitivity to sunlight, so it will not make skin more prone to sunburn. One practical point worth noting is that high aluminum levels in a formula can occasionally leave white marks on dark fabrics if not fully dry before dressing.
Potential Side Effects/Adverse Reactions
Side effects and reactions to topical Aluminum Sesquichlorohydrex Peg vary from person to person. The following list covers potential issues, but most users will not experience them when the ingredient is properly formulated and used as directed.
- Mild skin irritation such as tingling, burning or redness
- Contact dermatitis in individuals with sensitivity to aluminum salts
- Blocked sweat ducts leading to tiny bumps or heat rash, especially in hot humid conditions
- Folliculitis, an inflammation of hair follicles, if sweat and bacteria are trapped under heavy application
- Staining or discoloration of clothing when product is not fully dry
If any uncomfortable reaction occurs stop use and consult a healthcare professional for guidance.
Comedogenic Rating
Rating: 1 out of 5
Aluminum Sesquichlorohydrex Peg is highly water soluble and does not contain oily or waxy components that typically clog pores. The molecule stays mostly on the surface, forming temporary plugs in sweat ducts rather than penetrating sebaceous pores that lead to acne. Because of this it earns a low comedogenic score of 1.
Suitable for acne-prone skin, though very heavy or occlusive formulations that combine multiple thickening agents could raise the risk of breakouts for some individuals.
People who experience folliculitis or heat rash in very hot climates should apply sparingly and give skin a chance to breathe between uses.
Summary
Aluminum Sesquichlorohydrex Peg functions as an antiperspirant, astringent and deodorant. It works by depositing aluminum ions that create tiny gel-like plugs inside sweat ducts, lightly contracting surface proteins and lowering skin pH to curb odor-causing bacteria. These actions translate to drier underarms, a firmer feel on the skin and reduced body odor.
While not as universally known as classic aluminum chlorohydrate, it is gaining traction in modern roll-ons and clinical-strength sticks because it rinses off cleanly and leaves less residue on clothing. Overall safety data are strong, showing minimal skin absorption and a low rate of irritation when properly formulated.
Most people can use products with this ingredient without concern, but as with any new skincare item it is wise to perform a quick patch test first to ensure personal compatibility.