Lactic acid is a gentle alpha hydroxy acid (AHA) naturally derived from fermented sugars and is well known for its ability to exfoliate while also providing hydration. It works by loosening the bonds between dead skin cells, allowing them to be shed more easily and revealing a brighter complexion. Because it has a larger molecular size than glycolic acid, lactic acid penetrates the skin more slowly, making it a suitable option for sensitive or dry skin. In addition to improving skin texture and tone, it helps support the skin's natural moisture levels, leaving the skin feeling refreshed.
In K-Beauty, lactic acid is commonly found in toners, exfoliating serums, masks and overnight treatments that focus on gentle skin renewal. Korean skincare embraces lactic acid for its ability to refine the skin without causing excessive irritation, making it ideal for maintaining a healthy skin barrier while improving radiance. It is often paired with ingredients such as hyaluronic acid, panthenol, ceramides and centella asiatica to boost hydration, soothe the skin, and strengthen barrier function. With regular use, lactic acid-infused products can help improve skin texture, brighten dullness & reduce the appearance of uneven skin tone.