Ingredient guide
Mandelic Acid
mandelic acid
In short
Mandelic acid is an AHA that exfoliates more gradually thanks to its larger molecular size. It helps refine texture, reduce visible discoloration, and is often preferred by reactive or redness‑prone skin.
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What it is
C8 alpha-hydroxy acid from bitter almond; larger molecular weight than glycolic acid produces slower transdermal penetration, translating to a more gradual exfoliation onset favoured by reactive and rosacea-prone skin types; keratolytic and melanogenesis-suppressive; controlled evidence supports reduction of post-inflammatory hyperpigmentation and melasma with lower erythema incidence than glycolic acid equivalents; moderate antibacterial activity useful in acne-related texture management.
When to use it
Evenings. The gentlest of the common AHAs, but still an acid.
A couple of nights a week to start.
On the label
Commonly 5–10% on labels
Its larger molecule works more slowly, which is why it suits reactive skin.
Pairs well with
Give these space
Both increase skin turnover. Using together can over-sensitise.
Alternate nights. SPF the next morning either way.
Layering multiple exfoliating acids in one session can over-exfoliate.
One exfoliating acid per session. Alternate across the week; a single combined formula designed for balance is the only exception.
Both are acidic; layering can increase tingling and sensitivity.
Use Vitamin C in AM and AHA at night.
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
- Mandelic Acid
- Hydrate
- Moisturise
Also found as
Related
Where to find it
Options across the range, not a ranking. Run one through Lens and MIRU will tell you if it fits you.
The Ordinary Mandelic Acid 10% + HA
Allies of Skin Mandelic Pigmentation Corrector Night Serum
Fit comes first: the Lens checks each product against your skin before any retailer link. We may earn a commission, at no cost to you. Picks are editorial, never paid.
Common questions
What does mandelic acid do for skin?
It gently lifts dull surface cells to improve smoothness and brightness. It can also help reduce the look of post‑blemish marks and uneven tone.
Is mandelic acid good for sensitive skin?
Yes. Its slower absorption often feels milder than glycolic acid, making it a common choice for sensitive or redness‑prone skin.
When should I use mandelic acid?
It’s typically used after cleansing on dry skin. Many people start a few times a week and increase as comfortable.
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Personal guidance, not medical advice.