Lactic acid is another alpha-hydroxy acid (AHA) used for chemical exfoliation.
Like other AHAs, it helps remove accumulated dead skin cells from the surface of the skin. This can improve rough texture, dullness, and uneven-looking skin tone.
Lactic acid also has properties that can support skin hydration, making it a popular option in formulations designed to provide exfoliation while maintaining moisture.
However, it can still cause irritation, particularly when overused or combined with several other exfoliating ingredients.