Although our black cumin seed oil is light and palatable, it actually contains 3 to 4 times more thymoquinone than most other black seed oils (we have 1.5%+).

ugly amazon link to the above claim

There is some debate in the reviews over Turkish (light) oil and Indian (dark) oil. Even if you don't use Amazon, there's some useful info on the oil itself, and several suppliers to investigate further.