Lactic Acid Peel 

As the name implies, it is derived from milk. Like glycolic and citric acid, it belongs to the class of acids called AHAs, which contain anti-aging properties. 

Lactic acid is particularly well-suited for use as an anti-wrinkle peel for all sensitive skin and is often used in medical-grade skin care products. As previously explained, the skin doesn't noticeably "peel" off—what is noticeable, though, is that the process uncovers remarkably smoother, brighter, softer skin.