Beauty Elixir

Can you use PHA with Salicylic Acid?

Use with caution

Yes, but not at the same time.

PHA and Salicylic Acid are both exfoliating acids. Layered together they can over-exfoliate, which shows up as stinging, shiny tight skin and breakouts. Pre-formulated blends are fine. Otherwise, use them on different nights.

How to use them

Alternate nights, for example PHA on Monday, Wednesday and Friday and Salicylic Acid on Tuesday and Thursday, with a plain moisturiser night in between if your skin feels sensitive. If your skin is resilient and already used to both, you can try layering them: apply PHA first, wait a few minutes, then apply Salicylic Acid.

  1. 1
    CleanseGentle cleanser, pat dry
  2. AM
    PHA (day 1)then moisturiser and SPF 50
  3. PM
    Salicylic Acid (day 2)then moisturiser

What PHA does

Polyhydroxy acids are the gentlest chemical exfoliants. They work only on the surface, hydrate at the same time, and are usually tolerated by sensitive and rosacea-prone skin.

Typical strength
3% – 10%
When
AM/PM
Irritation
Best for
Sensitive, Dry And Normal skin

Everything that pairs with PHA →

What Salicylic Acid does

An oil-soluble beta-hydroxy acid that gets inside pores to dissolve the sebum and dead skin behind blackheads, whiteheads and breakouts. It is the go-to for oily, acne-prone skin.

Typical strength
0.5% – 2%
When
AM/PM
Irritation
Best for
Oily And Combination skin

Everything that pairs with Salicylic Acid →

Trying to choose one? Read PHA vs Salicylic Acid: which is better for your skin.

Frequently asked questions

Can I use PHA and Salicylic Acid together?

Yes, but not at the same time. PHA and Salicylic Acid are both exfoliating acids. Layered together they can over-exfoliate, which shows up as stinging, shiny tight skin and breakouts. Pre-formulated blends are fine. Otherwise, use them on different nights.

Which goes first, PHA or Salicylic Acid?

Apply PHA first, then Salicylic Acid. The general rule is thinnest to thickest texture, and lowest pH first. For this pair, though, it is better not to layer them in the same routine at all.

Should I use PHA in the morning or at night?

PHA: works morning or night. You can use it daily. It is a good first acid, or a way to keep exfoliating on retinoid "rest" nights if your skin tolerates it.

Should I use Salicylic Acid in the morning or at night?

Salicylic Acid: works morning or night. Use as a cleanser daily or a leave-on 2% serum 3–4 times a week. It can dry out skin, so moisturise well.

Is PHA with Salicylic Acid safe during pregnancy?

Neither is a known risk in normal cosmetic amounts, but guidance varies for Salicylic Acid. Check with your doctor.

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