Quinoa is full of protein compared to other cereals and pseudo cereals. This explains that major popularity of this super seed around the world.
Just as an example, consider that 100-grams of quinoa offers approximately 14-grams of protein. Compare it to 100-grams of rice at roughly 2.6-grams of protein and you can see why quinoa is considered a complete protein grain. The protein in quinoa comes from lysine, a rare amino acid not present in many other grains.