I have been using the red bottle serum for the past 3 weeks - I transfer it between night and daytime routine and I really really love it. What I love about it is it has vitamin C but it doesn’t leave that burning feeling on my skin so I can put it on after I use a more abrasive kind of exfoliate. I just wanted to tell you thank you for creating such an amazing product. I really really love it, thank you so much!