Ingredient pairing
Can you mix Glycolic acid and Mandelic Acid?
Use with careUse these with care.
Two exfoliants at once is usually one too many, and a common cause of irritation.
Do this: Pick one, and alternate days if you want to use both.
☀ Morning
Nothing here☾ Evening
Glycolic acidMandelic AcidUse on alternate nights, not the same evening.
Skip if: sensitive, compromised barrier, rosacea
Ask your doctor in pregnancySkip if: very sensitive, compromised barrier
Ask your doctor in pregnancyWhich one goes first?
Not on the same night
Use Glycolic acid and Mandelic Acid on alternate evenings rather than layering them together.
How to introduce Glycolic acid and Mandelic Acid
- Patch test each one first: a coin-sized amount on your inner forearm for two or three days, watching for redness or stinging.
- Alternate nights: Glycolic acid one evening, Mandelic Acid the next, so your skin only handles one of them at a time.
- Start the exfoliating acid at once or twice a week and increase gradually, giving your skin time to settle between steps.
- If skin turns tight, flaky, red or starts to sting, drop back a step and let your barrier recover for a few days before pushing on again.
There is room for both here, as long as you build up gently and let your skin set the pace.
For your skin type If your skin is sensitive or reactive, take this pair slowly: Glycolic acid is the higher-irritation ingredient here, and using actives close together magnifies that.
Choosing between them instead? Glycolic acid vs Mandelic Acid →
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Glycolic acid and Mandelic Acid, answered
Can you mix Glycolic acid and Mandelic Acid?
Use these with care. Two exfoliants at once is usually one too many, and a common cause of irritation. Pick one, and alternate days if you want to use both.
Should you use Glycolic acid and Mandelic Acid in the morning or at night?
Keep them to the evening, but on alternate nights rather than together.
How should you introduce Glycolic acid and Mandelic Acid?
Patch test each one first: a coin-sized amount on your inner forearm for two or three days, watching for redness or stinging. Alternate nights: Glycolic acid one evening, Mandelic Acid the next, so your skin only handles one of them at a time. Start the exfoliating acid at once or twice a week and increase gradually, giving your skin time to settle between steps. If skin turns tight, flaky, red or starts to sting, drop back a step and let your barrier recover for a few days before pushing on again. There is room for both here, as long as you build up gently and let your skin set the pace.
What else should you not mix with Glycolic acid?
Glycolic acid is best kept apart from Retinol, Retinal, Hydroxypinacolone Retinoate, Retinyl Palmitate. Introduce any new active one at a time.
Sources
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General guidance, not medical advice. When in doubt, introduce one product at a time.