Mustard is made from the seeds of a mustard plant. These tiny seeds are black, white or brown. They are primarily used as seasoning ingredients in Indian cuisine. Mustard seeds contain calcium, dietary fiber, iron, manganese, magnesium, niacin, phosphorus, protein, zinc, and selenium, a trace mineral that is an antioxidant that may offer protection against asthma, heart attacks, and some cancers. Mustard seeds are known to speed up metabolism, decrease symptoms of rheumatoid arthritis, lower high blood pressure, soothe sore throats, bronchitis, and pneumonia. It also aids in helping reduce the severity of asthma.