Black seed oil is pressed from the seeds of the nigella sativa plant and is also known as black cumin, black cumin seed, and black caraway. So “black seed” is a common name, but what you’re really looking for is nigella sativa, the flowering plant that produces the medicinal seeds. Black cumin seed, for example, isn’t the culinary cumin you’re thinking of. Confusing, right? Bottom line: what you want is nigella sativa oil.