Ingredient pairing

Can you mix Tretinoin and Vitamin C (LAA)?

Use with careUse these with care.

Pure vitamin C and retinoids prefer different pH levels, so layered together they can be a little less effective and more irritating.

Do this: Keep vitamin C for mornings and the retinoid for evenings.

☀ Morning

Vitamin C (LAA)

☾ Evening

Tretinoin

TretinoinWorth paying for

Efficacy10

Acne10

Anti-aging10

Skip if: pregnancy, breastfeeding, very sensitive

Not in pregnancy

Vitamin C (LAA)Worth paying for

Brightening10

Efficacy9

Anti-aging7

Skip if: very sensitive, rosacea

Ask your doctor in pregnancy

Which one goes first?

Use them at different times

Do not layer these. Use Vitamin C (LAA) in the morning and Tretinoin in the evening.

How to introduce Tretinoin and Vitamin C (LAA)

Patch test each one first: a coin-sized amount on your inner forearm for two or three days, watching for redness or stinging.
Split them across the day: Vitamin C (LAA) in the morning, Tretinoin at night, rather than layered in the same routine.
Start the retinoid 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: Tretinoin is the higher-irritation ingredient here, and using actives close together magnifies that.

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More pairings with Tretinoin

More pairings with Vitamin C (LAA)

Tretinoin and Vitamin C (LAA), answered

Can you mix Tretinoin and Vitamin C (LAA)?

Use these with care. Pure vitamin C and retinoids prefer different pH levels, so layered together they can be a little less effective and more irritating. Keep vitamin C for mornings and the retinoid for evenings.

Should you use Tretinoin and Vitamin C (LAA) in the morning or at night?

Use Vitamin C (LAA) in the morning and Tretinoin at night.

How should you introduce Tretinoin and Vitamin C (LAA)?

Patch test each one first: a coin-sized amount on your inner forearm for two or three days, watching for redness or stinging. Split them across the day: Vitamin C (LAA) in the morning, Tretinoin at night, rather than layered in the same routine. Start the retinoid 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 Tretinoin?

Tretinoin is best kept apart from Salicylic acid (BHA), Lactic acid, Glycolic acid, Mandelic Acid. Introduce any new active one at a time.

Sources

Plus how we reach every verdict: how we score →

General guidance, not medical advice. When in doubt, introduce one product at a time.