Not going to lie, when my skin is particularly angry and flaring up, this calming serum burns like absolute fire when applied. The burning doesn’t just last for a few seconds either. It’s minutes of stinging, burning, face feels like it’s on fire awfulness. It was the worst the first week as I tried to get my dermatitis under control. My worst spot was on my eyelids, so it’s super sensitive, which likely accounts for the intense reaction. I honestly would have quit using it after the first day if I hadn’t seen immediate improvement. My eyes have been driving me crazy for over a year and this was the first product that actually helped. I hated using it because it was wildly uncomfortable, but the difference in my angry, flaking, horribly itching eyes was almost instant. The intense burning sensation gradually improved with continued use and finally got to a point where it didn’t burn anymore after about a month. As long as I keep up with the 3 step routine, I don’t have too many issues with the incredibly uncomfortable burning sensation. This product, while not my favorite to use, has been essential to fixing my skin and I’m so glad I didn’t give up on it. Having normal eyes again is a huge victory and worth every uncomfortable application.