Ingredient guide
Lactic acid
lactic acid
In short
Lactic acid is an exfoliant generally associated with skin texture and smoothness, hydration and tone and pigmentation. It is backed by a strong body of published research. It is often chosen for dry and combination skin. MIRU describes it by what is visible on skin — never as a treatment or cure.
Reviewed against published evidence · editorially independent · no brand pays for placement
Works for
Texture · Hydration · Tone
Skin type
Dry · Combination
Best used
Evening
What it is
Gentler AHA. Hydrating side-effect. Good starter exfoliant.
When to use it
Evenings — like other exfoliating acids, it prefers night.
A couple of nights a week to start.
On the label
Commonly 5–10% on labels
Reads gentler than glycolic at the same number.
Pairs well with
Give these space
Both increase skin turnover — using together can over-sensitise.
Use AHA in the AM and retinol in the PM, or alternate nights.
Layering multiple exfoliating acids in one session can over-exfoliate.
Use AHA on some days and BHA on others, or use a combined formula designed for balance.
Both are acidic; layering can increase tingling and sensitivity.
Use Vitamin C in AM and AHA at night.
AHA increases UV sensitivity — always follow with SPF in AM use.
Apply SPF after AHA in the morning, or move AHA to PM-only.
The same rules the product checker and routine builder run — friendly scheduling, not prohibitions.
Where it sits
An evening treatment step — after cleansing, before the heavier layers go on.
- Cleanse
- Lactic acid
- Hydrate
- Moisturise
Related
Where to find it
MIRU hasn't verified a catalogue pick that leads with lactic acidyet. The Lens can check any product you're considering.
Search the Lens for lactic acidCommon questions
What does Lactic acid do for skin?
Lactic acid is associated in published research with skin texture and smoothness, hydration and tone and pigmentation. Gentler AHA. Hydrating side-effect. Good starter exfoliant. MIRU frames ingredients by what is visible, not by medical claims.
When should I use Lactic acid?
Lactic acid is typically used in the evening. Introduce any new active on its own first and add one product at a time so you can see how your skin responds.
Is Lactic acid suitable for my skin type?
Lactic acid is often chosen for dry and combination skin. It can be used with care — if your skin is reactive, patch-test first and watch for any irritation.
Checking a product label? Use the product checker to rate the full list against your current focus.
Personal guidance only · For clinical concerns, see a dermatologist.