I'm one of those people who bought this product after watching a YouTube video. I'm impressed that it took over 10 years to develop. Unlike Sofina IP, it's supposed to be used after lotion, but I followed the YouTube video and use it after washing my face. It's Curel, so I can use it with peace of mind. I was concerned that it left a slightly sticky feeling after using it after lotion. It seems to be good, especially in winter mornings, as it improves blood circulation. I haven't seen any visible results so far, but I'll consider repurchasing it after I finish using it.