Ingredient guide
Glycolic acid
glycolic acid
In short
Glycolic acid is an exfoliant generally associated with skin texture and smoothness and tone and pigmentation. It is backed by a strong body of published research. It is often chosen for combination and oily 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 · Tone
Skin type
Combination · Oily
Best used
Evening
What it is
Smallest AHA molecule — deepest penetration. Use sunscreen the next day.
When to use it
Evenings — exfoliating acids sit best away from daylight hours.
A couple of nights a week to start.
On the label
Commonly 5–10% in leave-on products
Higher figures belong to short-contact peels and rinse-off formats, not daily layers.
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
- Glycolic acid
- Hydrate
- Moisturise
Related
Where to find it
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Search the Lens for glycolic acidCommon questions
What does Glycolic acid do for skin?
Glycolic acid is associated in published research with skin texture and smoothness and tone and pigmentation. Smallest AHA molecule — deepest penetration. Use sunscreen the next day. MIRU frames ingredients by what is visible, not by medical claims.
When should I use Glycolic acid?
Glycolic 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 Glycolic acid suitable for my skin type?
Glycolic acid is often chosen for combination and oily 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 only · For clinical concerns, see a dermatologist.