I have - the type they encourage you to use is CBD oil. However, I checked with the integrative physician I see - he did training at the Oasis of Hope in Mexico, one of the first holistic/alternative cancer centers around - and he said that he doesn't see that it helps with breast cancer, although he has seen some success with other cancers. Instead, he has me on low dose naltrexone, something called PolyMVA (an anti-toxin), a lot of vitamin C and something called Transfer Factor Multi Immune which is made of a number of vitamins and minerals that strengthen the immune system.

I get the CBD oil which has no psychoactive effects (no high) and take it for better sleep thru the night. Legal immunity state with $125 card and nurse's note. Anout $50/month.