Spirulina powder is pressed to become spirulina tablets, appears dark blue green. Spirulina is a class of lower plants, belonging to the phylum Cyanobacteria, growing in water, suitable for high-temperature alkaline environments, under microscope appears screw-shaped. Spirulina is rich in high-quality protein, fatty acids of γ-linolenic acid, carotenoids, vitamins, and a variety of trace elements such as iron, iodine, selenium, zinc, etc.