Ingredient

Lactic acid

Also known as: AHA, alpha hydroxy acid

An alpha hydroxy acid that loosens dull surface cells. Milder than glycolic acid, and a humectant as well.

Typical percentage: 5%
INCI name: Lactic Acid
Skin concern: Uneven tone
Oil and breakouts
Skin type: Normal
Combination
Oily
Dry
Benefit: Exfoliation
Hydration

A hand using an exfoliating tool on skin

What it is

Lactic acid is an alpha hydroxy acid (AHA). It loosens the bonds between dead cells on the surface so they shed more evenly. Its molecule is larger than glycolic acid, so it works closer to the surface and tends to be easier to tolerate.

It is also part of the skin's own natural moisturising factor, so at low strengths it holds water as well as exfoliating.

How we use it

At 5% with 2% mandelic acid, at a pH of about 3.8. A leave-on liquid, not a peel.

How to use

Evening, two or three times a week. Sweep over clean dry skin, avoid the eye area, then moisturise.

Pairs well with

Mandelic acid, and a ceramide moisturiser afterwards. Sunscreen every morning.

Cautions

Stinging that lasts longer than a minute means use it less often. Do not use on the same evening as retinal. AHAs make skin more sensitive to the sun, so use sunscreen daily and for a week after you stop.

This page is general information, not medical advice. Patch-test any new product.