The main thing with CBD that you need to research is the Absorption rate and the bio availability. You have to remember that your body is made of more than 60% water and let's be real, (CBD) OIL and water do not mix so in most cases you are getting less than 6% absorption and bio availability for 3-4 hours. I have been using a product for about 90 days mainly for Plantar Fasciitis that has studies showing over 90% absorption and has a bio availability of 12 hours. Not only does it reduces the pain immensely, it also helps with sleep and anxiety.
I have a friend who's kid takes it for severe adhd and it has made a night and day difference
The main thing is MAKE sure you are getting a HIGH quality product. Unless you normally buy sushi from a gas station