Black Cumin Seed Oil 500 mg, Value Size, 240 Softgels, Source NaturalsSource Naturals Black Cumin Seed Oil Dietary Supplement. For Respiratory Support. Black cumin is an annual flowering plant native to the Mediterranean. Preclinical research suggests that the oil from black cumin seeds may help support a healthy respiratory system, along with healthy intestinal function. Additional clinical research has demonstrated that black cumin seed oil at the dose provided by this product supports cognition and a healthy memory.