Isopropyl Palmitate Say that three times fast. "The long-chain fatty acid is a common ingredient in moisturizer and tends to be comedogenic," says Arch. There's also isopropyl myristate, another long-chain fatty acid. Used as an emulsifier in many moisturizers, it's in prescription Retin-A, and the reason why some people may get blackheads from using the treatment, according to Rouleau.
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