There is a difference between various oils. Hemp seed oil is usually the least recommended, based on my own reading. You want hemp oils that use the whole plant, not the seeds.
I see a lot of posts about the wonders of CBD oil, and what it did for someone's pet. I did get the Charlotte's Web CBD oil and tried it on myself first. I didn't care for the side effects and sent it back, never used it for Jennie, who I bought it for.
Again, my complaint is, no one really knows what the long term effects are for this. For Jennie, long term isn't an issue as she doens't have long term. Maybe it would have been a miracle for Mazy cat, maybe not, but I just didn't feel it was safe to try. Especially with her elevated liver values.