White asparagus is a good source of calcium, phosphorus, potassium, and vitamin C. It also contains fiber, iron, niacin, and vitamins A, B1 and B2. White asparagus is a good source of antioxidants rutin, ascorbic acid, tocopherol, glutathione and ferulic acid. The pale variety also contains a high amount of aspartic acid, which was named after asparagus, the source from which it was first isolated.