This is an okay product which does improve the appearance of my hair somewhat, but it doesn't perform as well as others I've tried.
I would run it through the ends of my hair after blowdrying or when they were looking dull and frizzy. It definitely looks like you've put a serum in your hair afterwards, so while it does improve it somewhat, it definitely doesn't look like you've got beautiful naturally un-frizzy hair!
I am currently half way through one of theses, and unfortunate to say I don't think I'll be repurchasing. I have natural curly, sometimes frizzy hair, and if I put this in my hair wet or dry it looks like I've just put heaps of oil in my hair that isn't doing anything. But I when I apply to my hair after straightening it works a bit better as an anti frizz serum, but it doesn't seem to hold for very long. It is worth a try if you are having a frizz problem, because everyone has different hair. the only thing is you def do not want to put to much because then your hair will look like a grease ball.