What are they?
AHAs are alpha hydroxy acids - a class of chemical compounds that can be either naturally occurring or synthetic. Many are derived from organic sugars, with glycolic acid (from sugar cane) and lactic acid (from milk) the best-known and best-researched of the bunch.
What are they used for?
In over-the-counter products, AHAs offer chemical exfoliation as an alternative to manual exfoliation, working primarily by dissolving the bonds between skin cells to allow the removal of dead cells and a subsequently smoother skin surface.
