Salicylic Acid
In plain terms
The acne exfoliant that clears pores by dissolving the glue between dead skin cells. A relative of aspirin, it is well-handled at the low strengths in everyday products, with the cautions stacking up at higher doses, on large areas, and for young children.
What the evidence shows
Salicylic acid is the oil-soluble exfoliant behind most acne products, a close relative of aspirin that works by loosening the dead cells clogging pores. For adults at everyday-skincare strengths, Europe's safety committee has repeatedly judged it safe, setting limits around 2% in leave-on products and higher in rinse-offs. The cautions are real but cluster at the edges. High concentrations over large areas of skin can push enough into the bloodstream to cause salicylate toxicity, the overdose risk aspirin carries, which is why whole-body and high-percentage peel use is the careful zone, not a dab on a blemish. Pregnancy follows the same logic: low-strength application to small areas is considered low-risk, while strong peels, large areas, and broken skin are what to skip. Two newer threads round it out. Lab studies suggest a mild anti-androgenic, hormone-nudging effect that put it on Europe's endocrine watchlist, though regulators still cleared it for adults at these concentrations after weighing that in. And as of 2025 the committee judged current limits too high for children aged three to ten. For a non-pregnant adult treating acne, it is effective and well understood; the verdict turns on dose, area, and age.
On the label
Listed as salicylic acid or BHA. Everyday acne strengths (around 0.5 to 2%) on small areas are the well-tested zone; high-percentage peels, whole-body use, and products for young children are where the limits tighten, and where pregnancy advice leans cautious.