I have to admit I was a bit worried about spending over $300 on a serum. Nothing else I had tried really worked so I was quite cautious about wasting more money. I managed to buy it during the winter sale, so it cost me just over $250. I’m so glad I did that! This is the one serum that my skin has actually responded to, immediately, and it’s still improving every day. It’s reversed years of poor sleep, overwork and bad hydration. My dull complexion is now brighter and I can literally feel that my skin is tighter. Even without the sale, I’d pay full price for this now that I’ve tried it