Amaranth is a grain that is a member of the bean family. Amaranth is a gluten-free grain that is high in protein and fiber. It is a good source of iron, calcium, and vitamin B. Amaranth is a good source of dietary fiber, protein, and iron. It is a good source of calcium, iron, and vitamin B. It is a good source of dietary fiber, protein, and iron. Amaranth is a good source of calcium, iron, and vitamin B.