Kalonji oil is an essential oil obtained from tiny black seeds ofnigella sativa. The strong medicinal benefits of this oil have long been appreciated. However, the most talked benefit of kalonji oil is its effectiveness in preventing hair loss in both men and women. Kalonji / Black Seed is considered to be one of the greatest healing herbs of all the times. Black Seed has a history of more than 2500 years. This makes it one of the safest plant extracts for human consumption.