Stratum corneum hydration modulation via alpha-hydroxy acid effect

The phrase "Stratum corneum hydration modulation via alpha-hydroxy acid effect" does **not** refer to a single molecular target such as a receptor or enzyme. Instead, it describes a **physiological process** by which **alpha hydroxy acids (AHAs)**—a class of water-soluble organic acids including glycolic, lactic, tartaric, mandelic acids—modulate the outermost layer of the epidermis known as the stratum corneum. AHAs act primarily by breaking down intercellular bonds between dead keratinocytes through targeted desmosomal degradation without compromising deeper barrier structures. This results in enhanced exfoliation/desquamation and smoother texture while also stimulating collagen production and increasing hyaluronic acid levels within the epidermis. These effects collectively improve surface hydration ("plumpness") and can reduce roughness associated with dry or photoaged skin. While AHAs are widely used in cosmetic dermatology for their exfoliating properties and ability to enhance moisture retention in the stratum corneum,[1][2] this process itself is not considered a therapeutic "target" like an enzyme or receptor would be. Rather it is an outcome achieved through topical application of various AHA-containing formulations. Notably, use of AHAs increases photosensitivity due to thinning/renewal effects on superficial layers,[3] so sun protection is recommended during treatment periods. Some individuals may experience irritation depending on concentration/formulation.[9] There are no established biomarkers nor direct disease associations beyond general improvement in conditions related to dry/sun-damaged/acne-prone skin.[8] In summary: this entry does not correspond to a canonical drug target but rather describes how AHAs modulate stratum corneum function/hydration—a well-characterized mechanism relevant mainly within cosmetic science rather than pharmacological targeting.[1][4]

Other names

Alpha hydroxy acid-induced stratum corneum hydrationAHA-mediated skin barrier modulationAlpha hydroxy acid effect on skin hydration

Facilitation of desmosomal degradation leading to increased corneocyte desquamation/exfoliation. Weakening bonds between dead skin cells to promote shedding and reveal fresher layers beneath. Stimulation of collagen production and increase in hyaluronic acid content for improved moisture retention and plumpness.