Many herbs should not be combined with pharms at all such as ginger and turmeric. The things you can take with no interaction is olive leaf, a natural Antibiotic and grape seeds (red). Grape seeds are good for everything from the tip of your head to the bottom of your feet.
There was a crazy article on how ginger alleviated chemo symptoms. First am vastly against chemo and second ginger cannot be combined with pharms. It is amazing how much bull is in the news.