Lactic acid for the skin: benefits, side effects, and how to use it

From glycolic to salicylic, exfoliating acids have quickly become a mainstay in our beauty routines. But lactic acid seems to be the least known of the bunch, despite being a dermatologist’s favorite for boosting skin glow and hydration, as well as treating multiple skin concerns.

Lactic acid is naturally found in dairy products, and the use of lactic acid for the skin dates back to ancient Egypt, when Egyptians (including Cleopatra) would bathe in milk to improve the appearance and texture of their skin. Nowadays, it is typically manufactured in a laboratory and is often combined with other beneficial ingredients in serums and cleansers for smoother skin results.

Here, we ask expert dermatologists to break down everything you need to know about lactic acid for the skin, including where to find it and how to incorporate it into your routine.

What is lactic acid?

“Lactic acid is an alpha hydroxy acid (AHA) and a versatile ingredient that can help treat a range of skin issues,” he says. Derek PhillipsCeraVe Dermatology Consultant. A natural byproduct of dairy fermentation, which gives sour milk its distinctive, sharp taste.

And while we’re unlikely to be bathing in sour milk anytime soon, we can find lactic acid in many over-the-counter skin products as well. “In skin care, lactic acid is primarily used for Peeled “Its properties promote skin rejuvenation,” says Dr. Phillips. “However, it can also improve skin texture, has anti-aging benefits, and has been shown to reduce pigmentation.”

Lactic acid for the skin: how it works

1. Exfoliates the skin and promotes cell regeneration

“Lactic acid disrupts the bonds between dead skin cells in the outer layer of skin, allowing them to be shed more easily,” says Dr. Phillips. It all equals smoother skin, more even tone, and smoother lines.

2. It helps in treating pimples and acne scars

Lactic acid accelerates skin regeneration, promoting skin renewal. “Not only does this process reveal fresher, more youthful skin, but it also helps unclog pores, which can be helpful for treating whiteheads, blackheads, and acne pimples,” says Dr. Phillips.

3. Enhances hydration

Lactic acid is also a powerful humectant, meaning it helps attract moisture and pull it into the skin to keep it hydrated.

4. Supports the skin barrier

“Lactic acid has been shown to enhance skin barrier function by increasing the production of ceramides, which helps maintain a waterproof skin barrier, reducing moisture loss from the skin,” says Dr. Phillips.