Ingredient pairing

Can you mix Lactic acid and Vitamin C (LAA)?

Written by Maya Faour How we score →

Use with careUse these with care.

Lactic acid Vitamin C (LAA)

Pure vitamin C is itself an acid, so pairing it with other exfoliating acids is acid on acid.

Do this: Watch for irritation, and ideally use them on separate days.

Routine: Better kept to separate days than layered.

Lactic acidSolid and proven

Efficacy8

Hydration6

Anti-aging5

Skip if: very sensitive, compromised barrier

Ask your doctor 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?

Best kept apart

Rather than layering them, keep Lactic acid and Vitamin C (LAA) in separate routines or on separate days.

How to introduce Lactic acid 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.
Keep them on separate days rather than together, so they are not both working on your skin at once.
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 Sensitive skin should ease in gently: Lactic acid and Vitamin C (LAA) can be mildly irritating on their own, and more so alongside another active. On the upside, Lactic acid leans hydrating or soothing, which helps buffer the rest.

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Also worth checking

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Lactic acid and Vitamin C (LAA), answered

Can you mix Lactic acid and Vitamin C (LAA)?

Use these with care. Pure vitamin C is itself an acid, so pairing it with other exfoliating acids is acid on acid. Watch for irritation, and ideally use them on separate days.

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

Keep them in separate routines or on separate days rather than at the same time.

How should you introduce Lactic acid 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. Keep them on separate days rather than together, so they are not both working on your skin at once. 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 Lactic acid?

Lactic 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.