it takes two weeks to see a result [SEP] i am on my second day of using this product i have used other products some work some do nothing i am hoping for the former on this it has a very thin applicator brush so you can just line the upper part of your eyelashes and when dry you can apply mascara i have not had any adverse reactions i will know more as time goes on it looks like my lashes are darker already but that could be my wishful thinking