Lactic Acid in Skincare

At a glance

• Best for: dry texture, dullness, rough skin, gentle exfoliation
• Skin types: dry, normal, combination, sensitive when tolerated
• Typical concentration: 5-12% in many cosmetic exfoliating products

What it does

Lactic acid is an alpha hydroxy acid used for gentle surface exfoliation. Compared with glycolic acid, it is often considered more forgiving because it has a larger molecular size and also behaves as part of the skin moisturizing factor family. It is used in face care and body care for dullness, roughness, dry patches, and uneven texture. Lactic acid can still irritate if used too often, especially alongside other exfoliants, retinoids, or harsh cleansers. The most practical use is as a measured exfoliation step paired with moisturizers and sunscreen.

How it works

Lactic acid loosens dead surface cells so rough or dull skin can look smoother. It also has humectant behavior, which is why it is often used in dry-skin and body-care formulas. It does not dissolve oil inside pores the way salicylic acid does, so it is more surface-focused. Sensitive users should still patch test and avoid stacking multiple active steps. Since exfoliation can increase sun sensitivity, daytime sunscreen matters when lactic acid is part of the routine.

Pairs well with

• Glycerin
• Ceramides
• Hyaluronic Acid
• Niacinamide

Use caution with

• Other strong exfoliants in the same routine
• Harsh scrubs
• Retinoids if irritation occurs

Related concerns

• dry skin
• dullness
• rough texture

Evidence and sources

• DermNet NZ - Alpha hydroxy acids - AHA reference covering use and irritation cautions.
• PubMed - Lactic acid and skin hydration - Study discussing lactic acid and stratum corneum properties.

FAQ

• Is lactic acid good for sensitive skin? It can be gentler than some AHAs, but sensitive skin should still start slowly and stop if burning or prolonged redness occurs.
• Can lactic acid help dry skin? Yes. Lactic acid can support smoother dry skin, especially when paired with moisturizer and barrier-supporting ingredients.
• Is lactic acid the same as salicylic acid? No. Lactic acid is a surface-focused AHA, while salicylic acid is an oil-soluble BHA used more for clogged pores.
• Can lactic acid be used on body skin? Yes. It is commonly used for rough elbows, knees, dry patches, and body texture when the formula is intended for that area.
• Do I need sunscreen with lactic acid? Yes. Exfoliating acids can increase sun sensitivity, so sunscreen is important during the day.
• Can lactic acid and niacinamide be used together? Yes, if the skin tolerates the routine. Niacinamide can help support barrier comfort around exfoliation.