Also known as tapioca, manioc and yucca, cassava is a rich source of iron. It has high levels of vitamin C, which enhance iron absorption, and boost the immune system. Its healthy amounts of calcium, potassium and magnesium, help keep blood pressure regulated. Finally, cassava contains also respectful amounts of the vitamins B1 (thiamine), B2 (niacin), B3 (riboflavin) and folate.