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INCI name

LACTIC ACID

Lactic acid

BufferingHumectantSkin conditioningreviewed

An alpha hydroxy acid (AHA) used for exfoliation or to adjust pH.

What it is

Lactic acid is an alpha hydroxy acid. At low levels it simply adjusts the acidity of a formula; at higher levels and low pH it loosens the bonds between dead skin cells.

Where it is used

Found in exfoliating toners, peels and body lotions, and as a pH adjuster in many other products.

Limits of interpretation

The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.

Whether lactic acid acts as an exfoliant depends on its concentration and the product's pH, which the INCI list does not show. Products with AHAs can increase sensitivity to the sun.

Functions

Buffering
Stabilising the pH of an aqueous medium in a narrow range even if an acid or base is added. Altering and/or maintaining a cosmetic product's pH at the desired level.
Humectant
Retaining and/or preserving the moisture in a product during use.
Skin conditioning
Maintaining the skin in good condition.

EU regulation

This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

Products with this ingredient (2398)

Check a full ingredient list