I was asked to try this product through a major sampling/survey company for 2 weeks. Although we are not permitted to discuss details of the sampling period of time, I will tell you this...... Applying this serum directly on the corner of the eyes 2 times per day, you will see a noticable decrease in wrinkles and crows feet within 24 hours. It is hands down the quickest and also most gentle I have tried yet. I actually look younger and others are beginning to notice as well.