Coriander or cilantro is a wonderful source of dietary fiber, manganese, iron and magnesium as well. In addition, coriander leaves are rich in Vitamin C, Vitamin K and protein. They also contain small amounts of calcium, phosphorous, potassium, thiamin, niacin and carotene.Coriander lowers bad cholesterol (LDL) and increases the levels of good cholesterol (HDL).