i am a retinolaholic, this serum is wonderful. i pat it on all over my face, neck, and chest. Had wrinkles on chest, chest wrinkles are fading from every day use 2x a day. The serum has a feel good tingle to it, to me that means its working.I also purchased the 2 pack retinol pump creams. been using them for a long time now. It's best at night, i dab the serum all over my face, neck , and chest. I let the serum do its job first, it really feels good let it soak in , then i put a layer of the retSee full review