Polyhydroxy acids (PHAs) are ingredients like gluconolactone and lactobionic acid. They are said to be just as efficient as AHAs but less sensitising.
What are the benefits?
PHAs are slightly less sensitising on skin, making them more suitable for sensitive skin. Polyhydroxy acids may also act as antioxidants and have shown to improve the skin barrier's strength. Having said that, all exfoliating acids work by removing dead skin cell on the stratum corneum, they need to used with caution to avoid inflammation or over sensitisation of the skin.
Alpha Hydroxy Acid