I use it immediately after washing my face. It helps beauty ingredients penetrate, refines skin texture, and leaves it smooth. I use it as anti-aging care when I'm concerned about skin problems. My skin feels a bit tingly for a few days, so I feel like "Ouch!" while I'm doing my skincare, but it's tolerable when I think about how beautiful my skin is. The next day, my skin feels firmer and my facial lines are lifted. My skin also feels smoother, and makeup goes on so well, which I'm very happy about. I'd like to try the 700 next time.