I have used the Fructis Sleek & Shine Anti Frizz Sereum for a few years now and I enjoy it. The product last a while, especially if you don't use it all the time. It is very oily so you only need a little or your hair will look to greasy. A little goes a long way. I have think, curly, frizzy hair and I use this product when I want to straighten my hair. It helps tame my hair and give me a smoother, more sleek look with less frizz. I would recommend trying this product especially if you have thick frizzy hair and straighten it a lot!