afaik,. the Oil is a full extract of the plant, not just buds. So, beyond the fact that any oil will help, I don't know.
I will say, I was given only a 15% chance of survival of stage 4 colon cancer, 15 years ago. The quantum mind can help. Cannabis helps the QM. I went with the most radical western chemo and big doses of cannabis.
Re:the OIL. I use it on something only it will effect. I was left, from chemo, with an auto immune rash, slight patch, maddingly itching. Not any kind of skin coverage, luckily, but like brushing poison oak. It won't heal very quickly. I have patches that re-occur. But, the OIL? Knocks it out. And over time, is it my imagination or are they lessened? Good luck to your friend.