Alpha Hydroxy Acid (AHA) 12 January 2021A group of natural, mild acids found in foods. They are used in skin conditions such as dryness, aging, or acne. They also encourage desquamation by removing the layer of dead skin cells from the surface of the skin. Related Articles: Nail Care in the Caveman EraGlossary: Citric acidGlossary: Glycolic acidGlossary: Lactic acid