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All About Acids: Everything You Need to Know, From Ascorbic Acid to Salicylic Acid

Experts explain it all

by Rosie Narasaki  |  COMMENT

PHOTO 8/11
Polyhydroxy acid
Polyhydroxy acid "Polyhydroxy acids are a newer generation of alpha hydroxy acids," explains Guanche. "They are milder and less irritating (or stingy) when applied, but they still micro-exfoliate the skin." Since it's a larger molecule, PHAs are able to "remove the surface of dead skin cell layers without penetrating too deeply in the skin," which translates to less irritation, explains Guanche. She also notes that they're great for improving pigment, fine lines and even hydration (thanks to the fact that it's also a humectant).

Also, its gentleness makes it great for sensitive skin: "It's especially good for skin prone to rosacea and eczema and mature compromised complexions," says Lorencin.

If you like polyhydroxy acid, try: Glow Recipe Avocado Melt Sleeping Mask, $45

Buy now

SEE NEXT PAGE: Ferulic acid
 

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