What it does
- Exfoliates inside the pore lining to reduce congestion and blackheads.
- Supports clearer, blemish-prone and oily skin.
- Helps smooth texture and refine the look of pores.
How it works
As a lipophilic (oil-soluble) acid, salicylic acid penetrates sebum-filled pores where water-soluble AHAs cannot, loosening dead cells and clearing congestion. It also has mild anti-inflammatory character. Its free-acid exfoliating activity depends on a sufficiently low pH (around 3–4).
Use level
- Typical use level
- cosmetic leave-on typically 0.5–2%
Cosmetic leave-on products commonly use 0.5–2%. Rinse-off products may use somewhat higher levels in some regions, subject to local rules.
Formulation considerations
- Oil-soluble; requires a solubiliser or a suitable solvent system to stay dissolved in water-based products.
- Needs low pH (around 3–4) for free-acid exfoliating activity.
- Can recrystallise if solubilisation is inadequate.
What it pairs with & what to avoid
Pairs well with
- Niacinamide
- Gentle hydrators (to offset dryness)
- Azelaic acid (blemish-prone skin)
Use with care / avoid
- Stacking with other strong acids or retinoids at once (irritation)
- Use on very young children's large areas (see local rules)
Regulatory status
Salicylic acid is listed in the EU CosIng database and is subject to EU concentration limits and usage restrictions (for example limits differ for leave-on, rinse-off and certain product types, and there are restrictions for young children). Formulators should follow the current EU limits for their product type.
Common questions
What percentage of salicylic acid should I use?
Leave-on cosmetic products commonly use 0.5–2%. Follow the current regulatory limit for your product type and market.
What pH does salicylic acid need to work?
Its free-acid exfoliating activity needs a low pH, generally around 3–4.
Salicylic acid vs glycolic acid — which should I use?
Salicylic acid is oil-soluble and gets into pores (good for congestion and oily skin); glycolic acid is water-soluble and works on the surface (good for tone and texture). They suit different concerns.