Glycolic acid is a form of AHA, usually derived from sugar cane. Other AHA’s include mandelic acid, made from bitter almonds, citric acid, malic acid (from apples) and lactic acid. Peels are usually not sun-safe. AFA is an Amino Acid Filaggrin based Antioxidant. A Filaggrin is a protein that occurs in the upper layer of the skin which is responsible for the skin’s ability to retain moisture. The skin can safely take a much higher percentage of AFA’s than any other acid peel. AFA peels don’t actually “peel” and they are SUN-SAFE!