Salicylic Acid is a beta hydroxy acid (BHA) — a lipophilic (oil-soluble) exfoliant that penetrates into pores to dissolve sebum and dead cells, making it the gold standard for acne-prone and oily skin. Derived from willow bark or commercially synthesized, it has a molecular weight of 138.12 Da and is registered as EU CosIng #37595. CIR classifies it as "Safe with Qualifications." The SCCS (June 2023) confirms safety at ≤2% leave-on products and ≤3% rinse-off, with specific limits for sensitive areas. Often better tolerated than glycolic acid for oily and acne-prone skin, it does NOT increase UV sensitivity. Found in 7,115 products.
Salicylic Acid (INCI: SALICYLIC ACID, CAS 69-72-7) is a beta hydroxy acid (BHA) — a lipophilic (oil-soluble) organic acid with a phenolic structure. Unlike alpha hydroxy acids (AHAs) which are water-soluble, salicylic acid's oil-soluble nature allows it to penetrate into sebum-filled pores and dissolve the waxy substances that clog them. It has a molecular weight of 138.12 Daltons and is registered in the EU CosIng database (#37595) with functions as an exfoliant, skin conditioning agent, preservative, and fragrance/denaturant agent.
Salicylic acid is one of the most widely used active ingredients in acne and pore-care products worldwide. It works by breaking apart the intercellular lipids that bind dead skin cells and sebum (keratolytic and comedolytic effects), reducing bacterial colonisation (mild bacteriostatic effect, secondary to its primary keratolytic action), and reducing inflammation (anti-inflammatory effects). It is used in treatments for acne, blackheads, enlarged pores, dandruff, and warts. The CIR Expert Panel classifies it as "Safe with Qualifications" — meaning it is safe when formulated at appropriate concentrations, with suitable pH, and accompanied by appropriate use instructions. Our database identifies salicylic acid in 7,115 products, making it one of the most popular active exfoliants available.
The SCCS (Scientific Committee on Consumer Safety) evaluated salicylic acid extensively (SCCS/1646/22, June 2023) and confirmed safety at regulated concentrations: ≤2% for leave-on face products (and most body uses); ≤3% for rinse-off hair and body products; ≤0.5% for body lotion, eye care, lip care, deodorant, and oral care products; and ≤0.5% as a preservative. Salicylic acid carries multiple GHS hazard codes for the raw material (H302, H312, H315, H317, H318, H319, H361, H361d, H370, H372) — these apply to the concentrated chemical, not cosmetic formulations. A key advantage over AHAs: salicylic acid has NO photo-irritant or photosensitising properties (SCCS confirmed), so it does not increase UV sensitivity. However, SCCS/1675/25 (April 2025) raised safety concerns for children 3–10 years at aggregate exposure levels, and salicylic acid is not permitted for children under 3.
Salicylic acid is oil-soluble, allowing it to penetrate into sebum-clogged pores far more effectively than water-soluble AHAs. It dissolves the waxy sebum and dead cells that form comedones, prevents new breakouts, and reduces existing acne without over-drying the skin. Ideal for oily, acne-prone, and combination skin types.
By unclogging pores and removing dead cell buildup, salicylic acid visibly reduces the appearance of enlarged, congested pores. Skin texture smooths as pore blockages clear and sebum production normalises. Results are often noticeable within 2–4 weeks of consistent use.
Salicylic acid has aspirin-related anti-inflammatory properties that calm active inflammation, reduce post-inflammatory hyperpigmentation, and soothe redness associated with acne. This often makes it better tolerated than glycolic acid for oily, acne-prone, and inflamed skin — though at higher concentrations it can be equally irritating, and sensitive skin should still patch-test first.
Unlike glycolic acid (AHA), salicylic acid is NOT a photosensitiser and does NOT increase UV sensitivity (SCCS confirmed). This means you can use it morning or evening without heightened sunburn risk. Often better tolerated than glycolic acid for oily and combination skin types, though at higher concentrations it can be equally irritating.
Suitable for: Oily, acne-prone, combination, and congested skin. Use with caution on dry, sensitive, or eczema-prone skin. Not recommended for very young children (under 3: prohibited; 3–10: safety concerns at aggregate exposure per SCCS/1675/25). Always start at low concentration and build tolerance gradually.
Salicylic Acid carries a SkinSenseDiary safety rating of 3/10 — low risk. The CIR Expert Panel concluded it is "Safe with Qualifications" — safe when used at regulated concentrations (≤2% leave-on, ≤3% rinse-off) with appropriate formulation. The SCCS confirmed these concentration limits are safe with a margin of safety (MoS) of 167 at the precautionary scenario — well above the threshold of 100 for adequacy. Raw salicylic acid carries multiple GHS hazard codes including H361d (developmental toxicant), but dermal absorption reaches up to ~60% under maximum experimental conditions (real-world cosmetic exposure is considerably lower) and systemic exposure at cosmetic concentrations is minimal. Low sensitisation risk at cosmetic levels (SCCS: Buehler and LLNA tests negative, though rare individual reactions may occur). Often better tolerated than glycolic acid for oily and acne-prone skin.
Does NOT increase UV sensitivity: Unlike glycolic acid and other AHAs, salicylic acid is NOT a photosensitiser (SCCS confirmed: no photo-irritant, photosensitising, or photocarcinogenic properties). This is a major advantage. However, any exfoliating treatment weakens the outer skin barrier temporarily, so broad-spectrum SPF 30+ is still recommended as good skincare practice — but the heightened UV risk seen with AHAs does not apply.
Oil-soluble penetration requires caution: Salicylic acid's lipophilic nature allows deeper pore penetration, which is effective for acne but requires careful dosing. Start at 0.5–1% concentration, apply 2–3 times per week, and increase gradually as tolerance builds. Signs of over-use: persistent redness, irritation, peeling, or increased sensitivity.
GHS hazard codes apply to the raw material: The 10 GHS codes (including H361d for developmental toxicity) apply to concentrated salicylic acid. At cosmetic concentrations (0.5–3%) with buffered pH, the risk profile is substantially lower. Nevertheless, reproductive toxicity concerns warrant caution in pregnancy — see pregnancy section.
Prohibited for children under 3; concerns for 3–10: EU regulation: salicylic acid products cannot be marketed for children under 3 years. SCCS/1675/25 (April 2025) raised safety concerns for children 3–10 years at aggregate exposure to salicylic acid from multiple sources (skin care, cosmetics, medicinal products). Parental supervision and dose limiting are advised for this age group.
Not for spray or aerosol products: The SCCS advises against spray and aerosol formulations due to inhalation risk, particularly for young children and people with respiratory conditions.
Salicylic Acid carries GHS codes H361 and H361d ("suspected of damaging fertility or the unborn child" and "suspected of damaging the unborn child") for the pure substance — classified as Repr. 2 under CLP/GHS at the substance level, not a conclusion about cosmetic use. The SCCS referenced this classification and noted a NOAEL of 75 mg/kg bw/day, and that salicylic acid crosses the placenta. Unlike glycolic acid (where pregnancy data is simply limited), salicylic acid has a substance-level reproductive hazard classification and established placental penetration. Oral salicylates (aspirin) are known to cause developmental effects at therapeutic doses. At cosmetic concentrations (0.5–2%) with dermal absorption of up to ~60% under experimental conditions (real-world exposure considerably lower), systemic exposure is expected to be low. Topical salicylic acid at cosmetic concentrations is generally considered low risk, but many dermatologists recommend cautious use during pregnancy — particularly avoiding high concentrations or extensive body application. Limited use at the lowest concentration (0.5%) on small areas is generally regarded as acceptable. Consult your healthcare provider — alternatives such as lactic acid, azelaic acid, or physical exfoliants may be preferred during pregnancy depending on individual risk assessment. Nursing: limited data; caution is advised.
Start with a gentle, pH-balanced cleanser. Avoid using a physical scrub or brush — combining physical and chemical exfoliation increases irritation risk. Pat skin dry before applying salicylic acid.
Apply your salicylic acid product (toner, serum, or spot treatment) to clean, dry skin. Evening application is traditional, but since salicylic acid does NOT increase UV sensitivity (unlike glycolic acid), morning use is acceptable. Start with 2–3 times per week and increase frequency as tolerance builds. Avoid eye area and broken skin.
Allow salicylic acid to absorb for 5–10 minutes before layering other products. Follow with a hydrating, barrier-supporting moisturiser containing ceramides, hyaluronic acid, or niacinamide. This helps offset potential dryness and supports skin recovery, especially on sensitive areas like the eye and neck.
Apply broad-spectrum SPF 30+ every morning. While salicylic acid does NOT increase UV sensitivity like AHAs, sunscreen is always essential as part of a healthy skincare routine. Any exfoliating treatment temporarily weakens the outer barrier and increases UV vulnerability during the exfoliation phase.
Rinse-off format, typically 1–3% salicylic acid. Applied during cleansing for 30–60 seconds, then rinsed. Gentlest option; suitable for daily or twice-daily use. Good for beginners.
Leave-on format, typically 0.5–2% salicylic acid. Applied with a cotton pad after cleansing; absorbs quickly. Most popular format. Suitable for 2–5 times per week depending on concentration and skin type.
Concentrated leave-on format, often 2–3% or higher for targeted application. Used on active breakouts or congested areas. Apply directly to problem areas only. Use 2–3 times per week. Professional peels can reach 20–30%.
Excellent combination for acne-prone skin. Niacinamide strengthens the skin barrier, reduces sebum production, decreases inflammation, and improves post-inflammatory hyperpigmentation. Both work well together — this is one of the most recommended pairings for acne skin.
Hydrating and barrier-repairing ingredients that offset salicylic acid's drying potential. Apply after salicylic acid has absorbed. This combination balances exfoliation with deep hydration and barrier support.
Broad-spectrum SPF 30+ every morning is good skincare practice. Unlike glycolic acid, salicylic acid does not increase UV sensitivity, but the exfoliation process temporarily weakens the barrier. Sunscreen protects during this recovery phase.
Conflict severity: HIGH (3/10). Both are potent actives that increase cell turnover and irritation. Using them in the same routine or evening risks over-exfoliation, redness, and barrier damage. Recommended: alternate evenings (Mon/Wed/Fri salicylic acid, Tue/Thu retinol) or separate by 12+ hours if using in same day. New users should NOT combine.
Conflict severity: MODERATE (2/10). Both work best at low pH and can be individually irritating. Layering simultaneously may overwhelm the skin. Consider vitamin C in the morning and salicylic acid at night, or separate by 8+ hours. This pairing works for experienced users only.
Conflict severity: HIGH (3/10). Combining two exfoliating acids significantly increases irritation and barrier disruption risk. Never use salicylic acid and glycolic acid on the same evening. If combining in one routine, space by 24+ hours minimum (e.g., salicylic acid Monday, glycolic acid Wednesday). Over-exfoliation risk is severe.
Found in 7,115 products in our database. Here are some well-known BHA options. Note: formulations change — always check the current INCI list on the product packaging or label.
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