Black seed (Nigella sativa) is a flowering plant native to Asia and the Mediterranean. Its seed has been used to make medicine for thousands of years. Black seed might have effects on the body that help boost the immune system. People commonly use black seeds for asthma, hay fever, diabetes, high blood pressure, eczema, weight loss, menstrual cramps, and many other conditions. Black Seed Capsules may help in reducing symptoms of Rheumatoid Arthritis. Black Seed Capsules may be a natural alternative for reducing nasal congestion, itchiness on the nose, and sneeziness.