If your attention to sell the black seed oil is money driving, my advice is that there are more items available to sell and with less potential trouble than black seeds.
If your attention is to "help people". Then, on your life journey, you can find more and more chances to make money.
It likes a cat chasing his tail. The head is your intention. The tail is money. The tail can chase the head or the head can chase the tail. Their outlook like identical. But, the fact and results have a hug difference. The previous one is a lot of easier. The later one could never reach the money.