Some common peeling ingredients include alpha hydroxy acids, beta hydroxy acids, trichloroacetic acid (TCA) and retinol. Alpha hydroxy acids include glycolic acid (originally from sugar cane), lactic acid (originally from milk), malic acid (originally from apples and pears), tartaric acid (originally from grapes) and mantellic acid (originally from bitter almonds). Salicylic acid (related to aspirin) is the only beta hydroxy acid.
Not all peels are created equal, and one peel type doesn’t suit all. Certain ingredients may be more effective for treating acne, while others may be more successful in treating hyperpigmentation or the signs of aging.