The Ordinary AHA 30 + BHA 2 Peeling Solution - 1 fl oz - Ulta Beauty

With 30% Alpha Hydroxy Acids (Glycolic/Lactic/Tartaric/Citric), 2% Beta Hydroxy Acid (Salicylic Acid), Hyaluronic Acid Crosspolymer, Vitamin B5, Black Carrot and Tasmanian Pepperberry Alpha hydroxy acids (AHA) exfoliate the skin's topmost surface for a brighter and more even appearance. Beta hydroxy acids (BHA) work both on the skin surface and inside pores to help clear congestion. This combined 32% AHA/BHA solution offers deeper exfoliation to help fight visible textural irregularities, while targetting the look of fine lines with continued use. This pH of this formula is approximately 3.6. Glycolic Acid, the primary AHA present in the formula, has a pKa of 3.6. The pKa is the most important aspect to consider when formulating with acids as it implies acid availability. When pKa is close to pH, there is an ideal balance between salt and acidity, maximizing the efficacy of the acid and reducing the potential of developing irritation. Higher pH values in such a case would increase the concentration of salt, which counter-intuitively would make the formula even more irritating than if the formula was more acidic.Alpha hydroxyl acids (AHA) exfoliate the skin's topmost surface for a brighter and more even appearance. Beta hydroxyl acids (BHA) also exfoliate the skin with an extended function to help clear pore congestion. This combined 32% AHA/BHA solution offers deeper exfoliation to help fight visible blemishes and for improved skin radiance. The formula also improves the appearance of skin texture and reduces the look of fine lines with continued use. This formula contains a studied Tasmanian Pepperberry derivative to help reduce irritation associated with acid use. This derivative is of plant origin and varies in colour seasonally and this colour variation may be apparent in the formula from time to time. This formula is further supported with a crosspolymer form of hyaluronic acid for comfort, Vitamin B5 to assist healing and black carrot as an antioxidant. Note: This formula contains a very high concentration of free acids. We recommend use only if you are an experienced user of acid exfoliation and your skin is not sensitive. Contraindications: This formula should not be used on sensitive, peeling or compromised skin. Please refer to additional sun protection note and other warnings in provided Directions.