Homosalate
Also known as: Homomenthyl salicylate, HMS
The UVB backbone of almost every American chemical sunscreen — and a filter the EU quietly deemed risky enough to restrict.
What It Does
Deep Dive
Homosalate is a lipophilic UVB filter that dissolves easily in the oil phase of sunscreen, making it a go-to solvent and SPF booster in US formulations. The regulatory split is stark: the FDA still permits it at 15%, while the EU Scientific Committee flagged hormonal-disruption concerns and capped it at 7.34% in 2022, with some proposals to restrict it further. It also enhances skin penetration of other chemical filters, which is not what you want from a sunscreen. None of this means "panic" — a single summer of US sunscreen isn't a health crisis — but if you have the choice between a homosalate-heavy US stick and a Tinosorb-based EU/Asian sunscreen, the latter is the cleaner bet.




