What Is an AHA? Glycolic, Lactic and the Acids for Dull Looking Skin
Alpha hydroxy acids: water soluble exfoliating acids such as glycolic, lactic and mandelic, used for the look of brighter, smoother skin.
On the label
Glycolic acid, lactic acid, mandelic acid. A percentage on the front tells you strength; a lower pH makes the same percentage stronger.
What it does not mean
It does not mean safe for every night or for skin that is already pink. Alternate, never on a rolling night, and wear sunscreen.