I tried a sample of that serum and I immediately broke out the next morning. The strange thing was that my skin was clear and unclogged as I’d been using Differin Gel for months and had already gone thru the purging phase and was looking at a face with even skin tone, smoothness and no blemishes. I had the same reaction with the retinol eye cream and all of the Take the Day Off products. I think there must be a type of oil common in those products that I’m allergic to.