Salicylic Acid is a Beta Hydroxy Acid (BHA) that is oil-soluble, allowing it to penetrate deep into pores to exfoliate from within. It is the gold standard OTC ingredient for treating acne, blackheads, and clogged pores. Also has anti-inflammatory and antimicrobial properties.
Key Skin Benefits
+ Oil-soluble — penetrates deep into pores
+ Exfoliates inside pore lining to clear blackheads
+ Anti-inflammatory — reduces acne redness
+ Mild antimicrobial activity
+ Improves skin texture and smoothness
Pros
+ Gold standard for blackhead and acne treatment
+ Decades of clinical research and OTC approval
+ Oil-soluble property makes it unique among acids
+ Available at 0.5-2% OTC concentrations
Cons
− Can cause dryness, peeling if overused
− Not recommended during pregnancy (high oral doses linked to Reye's syndrome)
− May irritate very sensitive skin types
− Can be drying in alcohol-based formulations
Specifications
Property
Value
Usage Areas
Face, Body, Hair
Product Type
Leave-On, Rinse-Off
Source
Plant-derived (willow bark) / Synthetic
Natural Level
Natural-derived
Safety Ratings
Metric
Rating
Skin Sensitivity
2/5 (low to moderate)
Comedogenic Rating
0/5
EWG Score
3/10
Regional Regulatory Limits
Region
Leave-on %
Rinse-off %
Status
EU (CosIng)
Max 2%
Max 3%
Allowed — max 2% leave-on
US (CIR/FDA)
Up to 2% OTC
Up to 3%
Allowed — FDA OTC monograph
Japan (MHLW)
Max 0.2% (cosmetic)
Max 0.2%
Allowed — cosmetic max 0.2%
ASEAN
Max 2%
Max 3%
Allowed — follows EU
China (NMPA)
Max 2%
Max 3%
Allowed — max 2%
Typical Usage % by Product Type
Product Type
Typical %
Acne toner / serum
0.5 - 2%
Spot treatment
1 - 2%
Body acne spray
1 - 2%
Anti-dandruff shampoo
1 - 3%
References
Arif T (2015) — Salicylic acid in dermatology. PMID: 25896515
Kornhauser A et al. (2010) — Salicylic acid review. PMID: 20336774