Willow bark
Salix Alba Bark Extract
Marketed as natural salicylic acid, but salicin is not the same molecule and is far weaker.
How solid is the pore-clogging number
Willow bark rates 0 of 5 — no observed follicular occlusion in testing. The rating is graded moderate. Reasonably supported, but from fewer or less direct sources than the best-established ratings.
It describes the raw ingredient in isolation. In a finished product, how much is present and where it sits in the list matter just as much. Check a whole label to see it in context.