I absolutely love this serum. I've been receiving products for review since February and for those that call the Oz line of products a scam...have not seen my face. Like a fool I waited till the signs of aging started and progressed. I began with the retinal lotion I purchased before becoming a reviewer and loved what it's done for my skin. As for this serum...I got my best result applying right after using my derma roller....followed with a good moisturizer by Oz as well. Now I use before bed and first thing in the morning. I'm living proof this product, like their others....do work, at least for me!