... Food-grade 100% pure spirulina powder 2.High Protein >62% 3.Very low heavy metal content 4 ... spirulina is, by weight, a good source of protein, with around 60% of its dry weight consisting of ... . It is a very easily-digestible form of protein, as well, and in combination with its other ... cost, large amount of vitamins and minerals, high protein content, and ease of production, spirulina has often ...