Cell Perfecto is one of my all-time favorite serum! I have acne prone, sensitive skin, and it didn’t irritate me nor make me breakout. After a few weeks of use acne scars had started to fade, and after 6 months of daily use a lot of them had disappeared. I bought a second bottle, and after one year of continued use, marks and scars I thought could only disappear with laser treatment were nowhere to be found. I definitely recommend it!