Is a higher percentage of salicylic acid better?

Not usually. Most leave-on formulas sit at 0.5–2%, and going higher mainly raises the chance of dryness and irritation rather than doing more for the appearance of your pores.

Can salicylic acid be layered with retinol?

They can be used in the same routine, but many people alternate nights between them at first to keep the look of dryness and irritation in check, especially on drier or more reactive skin.

Who is salicylic acid best suited for?

Oily, combination and blemish-prone skin tend to see the most benefit, since its oil solubility lets it work inside congested pores rather than just on the surface.

Beta hydroxy acid (BHA)

Salicylic Acid

INCI: Salicylic Acid·Studied at 0.5–2%·Moderate evidence

An oil-soluble exfoliating acid that can get inside the pore lining, studied for the appearance of clearer, more refined-looking pores and a smoother surface. It comes from the same salicylate family as willow bark and has decades of use behind it, most often in leave-on toners, spot treatments and serums built for oily or blemish-prone skin. Because it dissolves in oil rather than water, it reaches inside a congested pore in a way most other acids cannot, which is why it remains a first choice for visibly clogged pores and surface bumps.

Studied for

·The appearance of clearer, more refined-looking pores
·The look of a smoother, more even surface
·The appearance of fewer visible breakouts and blackheads
·The look of reduced surface oiliness and shine

How it’s thought to work

Oil-soluble, so it works inside oily pores as well as on the surface, and is studied for association with the appearance of fewer clogged-looking pores; it loosens surface cells at low pH. It is thought to loosen the bonds holding dead surface cells together so they shed more evenly, and separately is studied for a mild calming effect that can support the look of less visible redness around blemishes. Both actions are usually credited for its long track record on oily, congestion-prone skin.

Landmark study· studied at 1.5%

A 1.5% salicylic acid cream was linked to visibly clearer looking, blemish-prone skin after 4 weeks in an open clinical study.

Clinical evidence on the efficacy and safety of an antioxidant optimized 1.5% salicylic acid (SA) cream in the treatment of facial acne: an open, baseline-controlled clinical study. Skin Research and Technology, 2013.

View on PubMed (PMID 23331850) ↗

Questions

Is a higher percentage of salicylic acid better?: Not usually. Most leave-on formulas sit at 0.5–2%, and going higher mainly raises the chance of dryness and irritation rather than doing more for the appearance of your pores.
Can salicylic acid be layered with retinol?: They can be used in the same routine, but many people alternate nights between them at first to keep the look of dryness and irritation in check, especially on drier or more reactive skin.
Who is salicylic acid best suited for?: Oily, combination and blemish-prone skin tend to see the most benefit, since its oil solubility lets it work inside congested pores rather than just on the surface.

Serums we’ve scored with Salicylic Acid

References

This dossier covers the efficacy evidence. For the safety and concern profile of Salicylic Acid, see PlainBody ↗, our sister site.