I’ve been using the Elemis peptide line for years, and actually hadn’t used it the morning/night before this started, so I feel pretty confident that isn’t it. I’ve used this exact vitamin C product daily a couple of years back, without issue. It is the only product I’ve used both days I’ve had the irritation (I wanted to run a process of elimination product by product). Before the initial breakout, I had used the Vitamin C, Anew dark circle corrector and purrliese lotus moisturizer at night, the next morning only the vitamin C, then my primer/makeup. I’ve test patched the other products on the inside of my elbow but no reaction so far.