I have used Li-Lash, which worked but took months to see a difference, Urban decays growth serum and conditioner, which worked great and showed growth during the first 2 weeks but then stopped working, but this stuff is crazy amazing. I'm nearly 50 and within 9 days (I got it 9 days before my 30th class reunion), I saw growth and curl. And not just a little growth, it was noticeable growth. And no irritation. I WILL be using this forever, or until there is something better, but I'm not holding my breath. This stuff is great!!