I decided to try this product after reading many positive reviews. I had noticed my lashes were thinning and more lashes than usual were falling out. I attributed this to age, I am close to 50. I researched another brand that had many positives reviews as well, however I was not willing to spend over $100 on a lash serum. After receiving this product, I used it as directed. I really didn't notice any change in the first two weeks of using it. Around week 2, I did notice that I was no longer losing lashes. At week four, I began to notice a pretty decent improvement. I have now been using this product religiously for 5 weeks. I have noticed longer, fuller lashes, and I am barely losing any of them. I will definitely purchase this eye lash/brow serum again.