It has a 7% concentration of glycolic acid, a well-researched alpha-hydroxy acid, and a Tasmanian pepper berry derivative from plants, whose color changes seasonally and occasionally makes the formula appear to change color. Use of this product is not recommended for skin that is sensitive, peeling, or impaired. Please pay attention to the prescription, other cautions, and remarks about sun protection. This formula has a pH of roughly 3.6. The most critical factor to take into account when formulating with acids is pKa, which is 3.6 for glycolic acid. PKa indicates the acidity of a molecule. An optimal equilibrium between saltiness and acidity exists when pKa is near to pH, increasing the acid's potency and minimizing discomfort. The Usual Tip: The multipurpose product can also be used on the scalp, where it hydrates the skin and restores balance while reducing dryness.