PHA (Polyhydroxy Acids)

Also known as polyhydroxy acids, gluconolactone, lactobionic acid

What are PHAs?

PHAs are exfoliating acids with very large molecules, so they stay near the surface of your skin. They loosen dead cells like AHAs do, with much less stinging. They also hold water and act as antioxidants, which suits sensitive, dry, and rosacea-prone skin.
Best forSensitive skin Rosacea Gentle exfoliation Dry skin

Pairs well with

  • Hyaluronic acid
  • Ceramides
  • Niacinamide
  • Retinol (on nights your skin is calm)

Use with caution

  • Other acids on the same night
  • Broken or sunburned skin

PHA FAQs

PHAs are gentler than AHAs. Their large molecules can't sink in as far, so they rarely sting.

Start with three times a week. Many people use a PHA toner daily once their skin adjusts.

PHAs are one of the few acids rosacea-prone skin usually handles. Patch test first.

Studies suggest PHAs don't raise sun sensitivity the way AHAs do. You still need daily sunscreen.

Related reading

AHA and BHA: a guide to exfoliating acids How often should you exfoliate? Rosacea explained: triggers and what to avoid

This content on this page is for general information only and is not medical advice. Always speak to a dermatologist before starting a new skincare routine.