Amaranth seeds / flour is full of lectins.

Does amaranth contain lectins?

Nutritionally, it's comparable to quinoa with a bit more protein and fiber than brown rice. And although, like most grains, its nutritional profile improves when sprouted, amaranth should be avoided by those who are are sensitive to grains and lectin.

Which grains are lectin free?

There are three ancient grains considered both lectin-free and gluten-free: sorghum, millet and teff. Although we don't know them that well in the western world, they are common crops in Africa and Asia and staples for billions of people around the world.