I have tried many similar tightening/hydrating serums, some much more expensive, but this one is the best! The results are truly amazing and I definitely have noticed a difference over time. I use it twice a day, at night I slather it on over my retin a (once it has dried) followed by fragrance free micro-sculpting cream, and in the morning I put a thin layer over my vitamin C serum before my sunscreen/moisturizer. There is an immediate tightening and lifting feeling. My skin is dry and sensitive and I have tried many products. My other anti-aging products can be drying and irritating, but this product is so soothing and allows me to continue using these other products. Thank you, Olay, it's definitely worth the money!