Lactic Acid is a skin’s own substance, being an essential component of the NMF (= natural moisturizing factor) as well as a AHA (=Alpha-hydroxy acid). 

Lactic Acid  acts in the stratum corneum with a two-fold effect: 

• moisturizing: it reduces skin scaling and balances the skin’s pH value to fight dry skin symptoms
• comedolytic: it inhibits the formation of comedones by helping the skin to shed and exfoliate and thus the pores from becoming clogged.