Kelp
Laminaria Digitata Extract
Seaweed extracts appear on clinic pore-clogging lists, though the sourcing is weak.
How solid is the pore-clogging number
Kelp rates 3 of 5 — a common trigger for acne-prone skin, especially leave-on products. The rating is graded disputed. Sources disagree. This figure circulates on clinic lists without a clear original citation, so treat it as a reason to patch test rather than a settled number.
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.