HOW TO CHOOSE AND USE BLACK SEED OIL
Cates recommends buying a high- quality, food- grade oil designed for internal use, which can also be used topically. ( Never ingest an oil intended only for external use.) She cautions that black seed oil can turn rancid and should be stored in a cool place, in a dark- colored bottle. The usual dose is Tbs. daily. Both the oil and seed extracts are also available in pills. Black seed oil is also called black cumin oil, or by its Latin name, Nigella sativa.
The chief active ingredient in the oil is thymoquinone, a substance that has demonstrated anticancer effects in lab and animal studies. Some oils are formulated to have a higher percentage of thymoquinone, and specify so on the label.