Lactic acid is a member of the alpha-hydroxy acid (AHA) family. Naturally present in the skin, it is produced by the good bacteria of the skin flora. It is thus qualified as post-biotic. In addition, this substance is also found in certain foods such as sugar cane and wine.
here are many lactic acid products for skin care, including serums, tonics and creams. This active ingredient is highly valued mainly for its keratolytic properties. Indeed, lactic acid for skin eliminates the dead cells on the surface of the epidermis, accelerating cell renewal. Thanks to its properties, lactic acid is an excellent active ingredient to fight against the signs of aging (wrinkles, fine lines) and against imperfections (acne, blackheads, post-acne spots). In addition to its exfoliating power, lactic acid maintains good hydration of the stratum corneum due to its hygroscopic properties. Moreover, scientific studies have also highlighted the depigmenting properties of lactic acid. Indeed, it inhibits the activity of the enzyme involved in the melanogenesis process (mechanism at the origin of melanin production): tyrosinase.
Compared to other molecules of the AHA family, notably glycolic acid, lactic acid has a gentle exfoliating power for skin. Unlike glycolic acid, which penetrates deep into the epidermis and can cause irritation, lactic acid acts on the surface. This is due to its higher molecular weight which does not allow it to penetrate the epidermis. Moreover, since lactic acid is a molecule naturally present on the skin, at the level of the Natural Moisture Factor (NMF), it is better tolerated by the skin.
Thus, lactic acid is a gentle exfoliant suitable for all skin types, even the most sensitive. It allows accelerating the cellular renewal while maintaining a good hydration of the epidermis.