I’d been using another derm-developed product for years and every time I tried something new, I went back. The others were either not as effective or my skin was too sensitive and broke out in rashes or acne. I decided to try Systeme 41 after seeing the ads on Instagram and I am sold, my skin has never looked better, I’ve had no sensitivity issues, and it costs about half of what I was paying for what I used to use. I am 60 years old, and have the skin of a 40 year old. I’ve seen 40 year olds that look older than me. Part of that is genetics, but the Systeme 41 products really enhance and refine my skin’s overall appearance. I have been using the products for a few months now and am extremely happy with the results. The only thing I could suggest would be a daily spf cream. I am still using my previous one, which it really like, but I’d rather use products from the same line. Otherwise, this is great stuff!