Red Mustard leaves are a beautiful deep green with red veins. Mature leaves may also take on a reddish hue. Mustard leaves are an excellent source of vitamins C and E, fiber, folate, calcium, iron, magnesium, potassium, and B6. The calcium in mustard leaves ranks among the highest in bioavailability. Similar to other plants in the Brassica genus, the sulfur-containing glucosinolate compounds in Red Mustard have potent anticancer and health promoting properties.