Polyhydroxy Acids (PHAs)
Also known as: PHA, gluconolactone, lactobionic acid, polyhydroxy acid
Gentle chemical exfoliants with larger molecular size that exfoliate while reducing irritation compared to AHAs.
See this ingredient in your own products — scan the label.
Get the appWhat it does
PHAs work by dissolving the bonds between dead skin cells to promote gentle surface exfoliation. Their larger molecular structure penetrates skin more slowly than AHAs, reducing irritation risk while still supporting cell turnover. They also function as humectants, drawing moisture into the skin.
Benefits
- Gentler exfoliation suitable for sensitive skin
- Improved skin texture and radiance
- Reduced irritation compared to AHAs/BHAs
- Hydrating properties alongside exfoliation
- Lower photosensitivity risk
Who it suits
- Sensitive skin
- Reactive skin
- Rosacea-prone skin
- Barrier-compromised skin
- First-time chemical exfoliators
How to use
Apply to clean, dry skin 2-3x weekly as a toner or leave-on treatment, starting at lower concentrations. Can gradually increase frequency as skin acclimates.
Pairs well with
Hydrating serums, Niacinamide, Ceramides, Hyaluronic acid
Be careful pairing with
High concentrations of other exfoliants same day
Safety & cautions
Generally well-tolerated, but start low and go slow with any new exfoliant. Discontinue if persistent redness or irritation develops. Sunscreen use remains important even with lower photosensitivity.
Educational information, not medical advice. Concentration and formulation change how an ingredient behaves.