Hi ennssh, I've had a lot of success with CBD oil (you can read about that here, if you want: https://multiplesclerosis.net/living-with-ms/cbd-hemp-how-helped/), however, while it has been helpful for some of my symptoms, I would not trust it to be effective at slowing the disease progression. While the science is there with regards to symptoms like spasticity and pain, there simply isn't the scientific proof yet that it can actually halt the disease. Still, I recommend discussing that with your doctor, I imagine they would agree. I see CBD oil, or even marijuana, along with a good diet and exercise as key tools to use alongside a disease modifying medication (like a tysabri, ocrevus, copaxone, etc).