I don't know if black seeds work or not. I can't see how they can cure virtually every disease known to human kind. I do know i will never use them unless they come with a money back guarantee . One thing I do know for sure, never never ever ever buy black seed, or any other oily seed for that matter that has been heated or ground. That destroys the volitile oils and renders the seed useless. I bought a small grinder when I started using flax seeds and pumpkin seeds. The difference in fresh raw over the processed was amazing.