All I can say is don't leave your hemp seed oil exposed to direct sunlight.
I just lost a whole bottle that way, cuz when my SO was cleaning up he stacked all my oils alll nice and organised in the the window sill.....for me!
also you can oil rinse with it, seal with it, pre poo with it. I've done all three.
Economy-wise I use sunflower oil to rinse and pre-poo, cuz its cheap and I can use alot. Its a ceramide oil also.