My first day I received I started using My Kiehl's. First I did my cleansing. I am in my 40's and pray that Khiel's can vanish my lines and dark eye mark away. The first my five steps. I had this tingling sensation on my face. The next morning I did the four steps as the Kiehl's midnight recovery concentrate is only for night use. It takes me about ten minutes morning and night with this process. My skin feels soft a smooth. Well my journey continues and hope this product will be a success.