I finished the 28 day challenge a few days ago and I'm finishing off the rest of the serum in the bottle. I'm sad to say that I didn't really see a difference in my skin. I am already hyper vigilant with my skincare. Prior to doing this challenge I was already using a day and a night serum, masking three to four times a week, and using day and night creams daily as well. I took three photos - day one, day fourteen, and the largest photo is day 28. Let me know if you ladies notice a difference. I think this product is great for someone who is new to skincare or someone who wants to up their game, but for someone like me all it did was add some hydration.