Ingredient guide
Lactic acid
INCI name · lactic acid
In short
Lactic acid is an exfoliant generally associated with skin texture and smoothness, hydration and tone and pigmentation. It is often chosen for dry and combination skin. MIRU describes it by what is visible on skin, never as a treatment or cure.
Skin type
Dry · Combination
Best used
Evening
What it is
Gentler AHA. Hydrating side-effect. Good starter exfoliant.
Evidence receipt
ModerateAHAs (glycolic/lactic) · applied to skin
Based on 2 sources
Open the citable recordStudied in relation to smoother, more refined-looking skin over time.
Studied as AHAs (glycolic/lactic): 8% glycolic cream, 8% lactic cream.
See 2 sources
Vehicle-controlled: 8% glycolic and 8% lactic creams improved photodamage in 76%/71% of facial sides vs 40% vehicle.
photodamage · 8% glycolic cream, 8% lactic cream
Archives of Dermatology, 1996AHAs produced ~25% increase in skin thickness with epidermal and dermal remodelling.
skin thickness, dermal remodelling
J Am Acad Dermatol, 1996
Affiliation note. Publication links report the study authors and their affiliations. MIRU does not infer independence from an affiliation alone.
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
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
Compare products
Browse product comparisonsWhere to find it
Examples, not a ranking. A product lookup can confirm identity and background; a verdict still needs the full ingredient list.
medicube Toner Pads Zero Pore Pad 2.0
Lactic acid toner as the first hydrating layer, applied while skin is still damp.
Product discovery is not efficacy proof. These examples are not ranked by commission.
Common 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.
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Personal guidance, not medical advice.