I already had decent lashes... not long but not short. However, I do strive to have them really long and thick. The product has been working for me but I didn’t see any decent results until 3 weeks later after applying them every night before I went to bed without skipping a day. The first 2 weeks I would wake up with dry, bloodshot eyes but it didn’t hurt. I’ve been using the product from the time of this review for about 5 weeks. After the third week my eyes had adjusted to the serum but right now I have noticed sensitivity around my upper and lower lids. Sometimes they look a little red and swollen but nothing to alarm me. It does give me a bit of dark circles even if I have been applying the serum to only my lash base. It could be that my eyelids can be extra sensitive sometimes. I noticed that if I apply it every other day my eyelids won’t be sensitive as before, perhaps the serum can be a little too strong if you use it everyday. Either way I’m still seeing consistent results. The reason I didn’t give it full stars is that the bottle doesn’t have enough product like how it says. I’m already running really low where my brush comes out dry, mind you it says on the website it should last 4-5 months and I’ve only had it for a little over a month. Perhaps they need to work on the formula So it doesn’t dry out as fast OR not false advertise the amount that you actually get. I did try putting the container in a cup of hot water For about 10 minutes or so to see if it had clumped up and only needed to “melt” from the inside, but nothing. So yeah I got little product and I don’t believe they give you 3ml possibly 1ml since you run out even if you follow their exact guidelines. Overall, it works. Don’t put on everyday if you have sensitive eyelids, and amount of product duration that is advertised is very inaccurate. That is all, good luck dears.