What counts as a pore-clogger
Pore-clogging, or comedogenic, ingredients are the ones that can block a pore and turn into a blackhead or whitehead. The usual suspects are heavy oils and butters (coconut oil, cocoa butter), fatty esters (isopropyl myristate, isopropyl palmitate, ethylhexyl palmitate), some algae extracts and a few emulsifiers such as laureth-4.
We sort them into two groups. High: consistently reported as pore-clogging in the classic tests and in dermatology guidance on acne and cosmetics. Moderate: reported in some tests, or only at high concentration, such as soybean oil, avocado oil, oleic acid and glyceryl stearate SE.