I give this product 5 star. If only i could give 100 stars I will definitely give it. This saved my sensitive skin. When I arrived here in Canada, my face really broke, acne started to surface on my face. I can't really sleep soundly, but this Serum saved the day. And of course my doctor at Derm.ca as well. With the help of all the products from revoderm that I have been using for almost 2 years now, really helped me a lot in maintaining my healthy skin. I never had any acne ever since. So thank you Revoderm and Derm.ca for your guidance and help. Love you all!😘