I made it clear that I had very sensitive skin. They should be telling you to test an inconspicuous spot on your arm BEFORE ruining your entire face. I had a major reaction, but it was only confirmed because they said to do a test patch AFTER my skin was ruined. I’m 2 months out, and my skin is broken out and inflamed 100 times worse than it was before I started. There’s no way to know which ingredient it was because they create a formula fang addressed everything at once, which I think is bad practice. If you value your skin, see a dermatologist in person.