I live in Jordan and that is how I became a specialist as this is a common stock item here. Now there are good seeds and there are low grade seeds as in anything.
I do buy Hemani Oil from Saudi Arabia which I feel is the best available in Jordan. I believe seeds are the best way to take black cumin or more commonly called black seeds. The trick is to take this daily.
I will send you many links and the new info is that is have been proven to cure Pancreatic cancer tumors. Well America has little knowledge on this as it is mainly practiced here. I sure wish I knew about this years ago.