Also known as black cumin, nigella or by its scientific name Nigella sativa, kalonji belongs to the buttercup family of flowering plants. It grows up to 12 inches (30 cm) tall and produces a fruit with seeds that are used as a flavorful spice in many cuisines. In addition to its culinary use, kalonji is known for its medicinal properties. In fact, its use can be traced back several centuries as a natural remedyTrusted Source for everything from bronchitis to diarrhea. This article discusses 9 of the most impressive science-backed benefits of kalonji, plus how you can add it to your diet.