I have tried various eyelash serums (e.g. vegamour - this is not an ads), and there were obvious results without any negative effects. And now for the first time I decided to test the Nulastin eyelash serum!Most of the reviews were so positive, with pictures of good results. I only tried Nulastin Lash Serum a couple of times, the first time my eyes were a little red, but ok, I thought it was a slight irritation after the first use and then it would stop, the second time after a few hours the lash line around the eyes started to hurt so bad. I quickly cleared my face.I contacted Nulastin customer service and they responded quickly, for which I am grateful. They told me not to use that day, and to use the serum once a day instead of twice. But the next day the situation got much worse! My eyes and the area around them are very red and painful. I used everything according to the all instructions. So be careful, use Nurlastin at your own peril.