Lactic Acid

LACTIC ACID
INCI Name: Lactic Acid

CAS Number: 50-21-5

Product Description
Lactic Acid is a naturally occurring alpha hydroxy acid (AHA) derived from the fermentation of sugars like corn, beet, or milk. It’s one of the gentlest AHAs, making it ideal for sensitive, dry, or mature skin. Lactic Acid works by loosening the bonds between dead skin cells, promoting exfoliation, and revealing a smoother, brighter complexion. It also acts as a humectant, drawing moisture into the skin and improving hydration.

Commonly used in peels, toners, serums, and creams, Lactic Acid helps fade hyperpigmentation, reduce fine lines, and improve skin texture.

Recommended Use Rate
Leave-on products 1–5%
Rinse-off products 5–10%
Professional peels 10–12% (max)

⚠️Regulatory Note: The FDA and EU CosIng databases permit Lactic Acid in cosmetics at concentrations up to 12%,

Key Benefits
Gently exfoliates dead skin cells

Hydrates and improves skin barrier function

Brightens dull skin and fades dark spots

Reduces the appearance of fine lines and uneven texture

Suitable for sensitive and dry skin types

Formulation Tips
Water-soluble; add to the cool-down phase

Adjust pH to 3.5–4.5 for safe leave-on use

Combine with niacinamide, hyaluronic acid, or panthenol for soothing effects

Avoid mixing with strong actives like retinol or vitamin C in the same phase