Methyl Salicylate

Methyl salicylate is a counterirritant/fragrance component used in topical analgesics and scented products; at typical leave-on levels it can provoke burning, erythema, and irritation, especially on compromised or eczematous skin. Patch test data and real-world reports show it can act as an irritant and occasional sensitizer, and its volatility/fragrance use increases risk for reactive individuals. Given its frequent intolerance in sensitive-skin populations and the potential for significant irritation when layered with other actives, it warrants a high irritancy score. Safety Notes: In mainstream cosmetic skin/hair products, methyl salicylate is most often used at trace fragrance/flavor levels (about 0.001–0.1%) in leave-on lotions, creams, cleansers, and shampoos. The highest consumer-available concentrations are found in OTC topical analgesic rubs/liniments and sports creams, where methyl salicylate commonly reaches ~10–30% in leave-on systems; these levels align with typical OTC drug-style formulations and corresponding safety/labeling constraints, while higher levels are generally not seen in standard cosmetics.