Cyanotech Corporation engages in the cultivation, production, and sale of natural products derived from microalgae for the health and human nutrition market worldwide. The Company's products include Hawaiian Spirulina Pacifica, a nutrient-rich dietary supplement that is used for extra energy, a strengthened immune system, cardiovascular benefits, and as a source of antioxidant carotenoids; and Hawaiian BioAstin natural astaxanthin, a dietary antioxidant, which is used as a human nutraceutical and functional food ingredient to support and maintain the body's natural inflammatory response, enhance skin, and support eye and joint health. Cyanotech Corporation sells its products in bulk quantities to manufacturers, formulators, and distributors in the health foods and nutritional supplements markets; and as packaged consumer products to distributors, retailers, and direct consumers.