Detailed answer

Lactic acid is an alpha hydroxy acid (AHA) commonly found in moisturizers. Its primary role is to exfoliate the outermost layer of the skin, removing dead skin cells and promoting cell turnover. This exfoliating action helps to reveal a smoother and brighter complexion. Additionally, lactic acid has humectant properties, which means it attracts and retains moisture in the skin, thus enhancing hydration levels. It also works to improve the skin's natural barrier function, allowing it to better retain moisture and protect against external aggressors.