Yonka Serum is a light weight concentrate of natural essential botanical oils that provide skin repair you can really see. You can use every day without worry about it feeling heavy or slick on your face. Massage a drop or two around your eyes and it just melts into your skin releasing fine lines and wrinkles and leaving fresher, softer and smoother skin. Use it day or night, even all day under your normal moisturizer. It keeps the little age lines around your eyes and mouth invisible to most and makes your skin feel younger...more pliable, like it used to feel. Being over 60 and not wanting the world to know it for sure, I fight the telltale signs of aging with everything I can. I'm not into expensive trendy cosmetics touted by Hollywood, so I expect visible results from the products I DO spend my money on. And Yonka delivers the kind of "seeing is believing" results I want. I love it and I wouldn't give it up for anything. When something works this well, why change?