Lactic Acid
Also known as: Lactic Acid, 2-Hydroxypropanoic Acid, Milk Acid
A gentle alpha-hydroxy acid that exfoliates dead skin and improves texture via chemical peeling.
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Get the appWhat it does
Lactic acid dissolves the bonds between dead skin cells on the surface, promoting cellular turnover and revealing smoother skin underneath. It is humectant-like, drawing moisture into the skin while exfoliating. Unlike stronger AHAs, it has a larger molecular structure, making it gentler and better-tolerated by sensitive skin.
Benefits
- Gentle exfoliation suitable for sensitive and reactive skin types
- Improves skin texture, tone, and clarity with regular use
- Hydrating exfoliant that also draws moisture to the skin
- Reduces appearance of fine lines and hyperpigmentation
- Lower irritation potential compared to glycolic acid
Who it suits
- Sensitive skin
- Reactive or compromised barriers
- Dry skin (due to humectant properties)
- Dull, uneven texture
- Acne-prone skin
How to use
Apply to clean, dry skin 2–3 times weekly in evening formulas (serums, toners, or peels) at 5–12% concentration. Allow skin to acclimate before increasing frequency.
Pairs well with
Niacinamide, Hyaluronic acid, Centella asiatica, Ceramides
Be careful pairing with
Other strong AHAs or BHAs (within same routine step), Vitamin C (can destabilize; use in different routines)
Safety & cautions
Start low and go slow; use 5–10% concentrations initially, especially for sensitive skin. Can increase sun sensitivity—always use SPF during the day. May cause mild irritation, redness, or stinging if pH is low or concentration too high.
Educational information, not medical advice. Concentration and formulation change how an ingredient behaves.