"I've been using this serum for about one month but noticed the difference after roughly 2 weeks. My skin is softer and seems to have more elasticity. For the customer who gave this 1 star, here's how to use this. Take out as much or as little as you want with dropper...deposit in palm of left hand (if you're right-handed), dip finger in serum and pat on face. After you've finished, pat entire face with both hands and you will notice that the stickiness diminishes. After that, I put on my Firming Facial Age Corrector Cream and my face feels nice and dewy. Like I said, great stuff Dr. Denese. We need this product on easy pay and auto delivery!!!