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Ingredient guide

Which actives can you use together?

Updated 5 October 2026

Most “never mix these” rules are about irritation, not danger. Here’s how the common pairings shake out.

  • Fine together
  • Easier apart
  • Keep separate
  • Easier apart

    Retinol + Vitamin C

    Not harmful together, but both can sting. Vitamin C in the morning, retinol at night.

  • Keep separate

    Retinoids + AHAs & BHAs

    Layered, they're a common route to redness and peeling. Use them on different nights.

  • Keep separate

    Benzoyl peroxide + Tretinoin

    Benzoyl peroxide can break tretinoin down. If either was prescribed, follow your prescriber.

  • Easier apart

    Vitamin C + AHAs & BHAs

    Both are acidic, so stacking them mostly adds irritation.

  • Fine together

    Vitamin C + Niacinamide

    The old warning came from less stable forms. Plenty of serums contain both.

  • Fine together

    Niacinamide + Retinol

    A common, gentle pairing. Niacinamide doesn't compete with retinol.

Popular examples

The most-discussed products in each category, with Australian prices.

A simple split

Morning

  1. 1Vitamin C
  2. 2Niacinamide
  3. 3Moisturiser
  4. 4Sunscreen

Sunscreen every day — retinoids and acids leave skin more sun-sensitive.

Night

  1. 1Retinoid or an acid — not both
  2. 2Niacinamide
  3. 3Moisturiser

Alternate retinoid nights and acid nights, with rest nights between.

Whatever you use

  • One at a time

    Start a new active twice a week, then build up.

  • Patch test

    A spot along the jaw for a few days first.

  • Pregnant?

    Retinoids are generally avoided. Ask your GP or pharmacist.

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General information, not medical advice. For a skin condition, or anything prescribed, talk to your GP, pharmacist or a dermatologist.