My hair is really dry and frizzy...on a humid day it looks as though it shrivels into a wild mess.

I have tried soo so many things from expensive to cheap...salon to homemade. So now I'm washing and conditioning with pureolgy for colour treated hair which promises to add moisture to damaged hair I'm also trying a product called cholesterol. Does anyone have any experience with this? Is it worthwhile? When buying this I also bought a tub of coconut oil..anyone try that? Did it help? .. or was this just another bad product. I've read reviews/opinions/sales pitches - but to actual see it from someone 'real' would help.