Ingredient review
Aluminum Sesquichlorohydrex PG
INCI: Aluminum Sesquichlorohydrex PG
A common antiperspirant ingredient that effectively reduces sweat but may cause irritation for sensitive skin.
In plain English
Aluminum Sesquichlorohydrex PG is a type of aluminum salt used in antiperspirants. When applied to the skin, it dissolves into a gel-like substance that temporarily plugs the sweat ducts, reducing the amount of sweat that reaches the skin's surface. It is not a deodorant—it does not mask or prevent odor, but by reducing sweat, it indirectly helps control odor. This ingredient is often combined with propylene glycol to improve stability and skin feel.
Quick decision guide
Useful, but context matters
Aluminum Sesquichlorohydrex PG can be useful, but watch for some irritation potential.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Aluminum Sesquichlorohydrex PG.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
strongThere is a stronger practical or research basis for the ingredient role described here.
What it is
A synthetic aluminum salt complex, specifically a form of aluminum sesquichlorohydrate reacted with propylene glycol (PG) to enhance its antiperspirant performance and reduce irritation potential.
How it works
When applied to the underarm, the aluminum ions dissolve into the sweat and form a temporary gel-like plug within the sweat duct. This physical blockage reduces the flow of sweat to the skin surface. The effect is temporary and wears off as skin cells naturally shed over time.
Pros
Highly effective sweat control
Clinically proven to significantly reduce underarm sweat, often lasting 24 hours or more with a single application.
Widely available and affordable
Found in most drugstore antiperspirants, making it an accessible option for everyday sweat management.
Cons and cautions
Can irritate sensitive skin
May cause stinging, redness, or itching, especially if applied right after shaving or on broken skin.
May leave white marks on clothing
The aluminum salts can form a visible white residue on dark fabrics, which can be difficult to remove.
Best for
- People looking for effective sweat reduction
- Those who experience heavy sweating or hyperhidrosis
Use caution if
- People with sensitive or easily irritated underarm skin
- Those who prefer aluminum-free or natural deodorants
Usage tips
Safety summary
Aluminum Sesquichlorohydrex PG is considered safe for use in antiperspirants by major regulatory bodies including the FDA and the Cosmetic Ingredient Review (CIR) panel. Some individuals may experience mild skin irritation. Long-standing concerns about aluminum and breast cancer or Alzheimer's disease have not been supported by strong scientific evidence, but some consumers choose to avoid it as a precaution.
Research notes
Numerous studies confirm the efficacy of aluminum salts for sweat reduction. Safety reviews by the CIR and FDA have found no conclusive link between aluminum in antiperspirants and chronic diseases. Research continues on potential skin irritation and environmental persistence.
Common label clues
- Typical concentration
- 10% to 25% in over-the-counter antiperspirants
- Regulatory status
- Approved as an OTC antiperspirant active ingredient by the U.S. FDA at concentrations up to 25%. Also permitted in the EU and other regions under cosmetic regulations.
- Common uses
- Antiperspirants, Deodorants
- Environmental note
- Aluminum compounds are mined and processed, which has environmental impacts. Some concerns exist about aluminum accumulation in waterways, but typical use in antiperspirants is considered low-risk for the environment.
Good to know
- This ingredient is classified as an over-the-counter (OTC) drug by the FDA and is regulated as an antiperspirant active.
- The 'PG' in the name stands for propylene glycol, which is added to improve the ingredient's stability and feel on the skin.
Common questions
What is Aluminum Sesquichlorohydrex PG in beauty products?
Aluminum Sesquichlorohydrex PG is a type of aluminum salt used in antiperspirants. When applied to the skin, it dissolves into a gel-like substance that temporarily plugs the sweat ducts, reducing the amount of sweat that reaches the skin's surface. It is not a deodorant—it does not mask or prevent odor, but by reducing sweat, it indirectly helps control odor. This ingredient is often combined with propylene glycol to improve stability and skin feel.
What does Aluminum Sesquichlorohydrex PG do in a beauty product?
When applied to the underarm, the aluminum ions dissolve into the sweat and form a temporary gel-like plug within the sweat duct. This physical blockage reduces the flow of sweat to the skin surface. The effect is temporary and wears off as skin cells naturally shed over time.
Is Aluminum Sesquichlorohydrex PG safe for most people?
Aluminum Sesquichlorohydrex PG is considered safe for use in antiperspirants by major regulatory bodies including the FDA and the Cosmetic Ingredient Review (CIR) panel. Some individuals may experience mild skin irritation. Long-standing concerns about aluminum and breast cancer or Alzheimer's disease have not been supported by strong scientific evidence, but some consumers choose to avoid it as a precaution.
Who should be careful with Aluminum Sesquichlorohydrex PG?
People with sensitive or easily irritated underarm skin Those who prefer aluminum-free or natural deodorants
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.