This mascara contains Keratin and I can honestly say that after a week of wearing this mascara (on its own & cocktailed) my lashes were stronger and more dense, which I was not expecting at all. The strength of the colour is good, but I found I had to take my time applying the product because if you want the full fanning effect, you wont get it by just doing a couple swipes on your lashes. Using this product .akes me want to try the Maybelline LashSensational mascara because they are made to do the same thing but the Maybelline is mucho cheapo