Cyanotech Corporation engages in the cultivation, production, and sale of natural products derived from microalgae worldwide.

The company's products include BioAstin Hawaiian Astaxanthin, a dietary antioxidant to enhance skin, and to support eye, joint and immune health, as well as used as a human dietary supplement and dietary ingredient; and Hawaiian Spirulina Pacifica, a nutrient-rich dietary supplement, which is used for extra energy, strengthened immune system, cardiovascular benefits, and as a source of antioxidant carotenoids.

It also provides contract extraction services. The company sells its products through distributors, retailers, and online channels; direct to consumers; and in bulk form to manufacturers, formulators, and distributors in the health foods, nutraceuticals, and dietary supplement markets.

The company was incorporated in 1983 and is headquartered in Kailua-Kona, Hawaii.