Exponent’s Time Rewind Retinol Power System. I love this product for many reasons and it will be my go-to Retinol moving forward. I first love the innovative system. The airtight containers allow the perfect dosage and activation of the product. One dispenser is a powder and a separate one is a Quadruple Hyaluronic Acid Hydrator. Stamp them both in your hand, mix for 5 seconds, and you get the perfect product. It is patented and ground breaking. Products loose their effectiveness and freshness as soon as they are opened. This packaging allows you to have a “first time” use with each use. The other thing I loved about the product is how quickly it sinks into my skin. It has a lux feel and immediately penetrates. I didn’t feel like product would be wasted ending up on my pillow at night. My skin took to this right away. I had not reactions or sensitivity. I can’t wait to try their Vitamin C!