what is spirulina for
Overview. Spirulina is a type of blue-green algae that is rich in protein, vitamins, minerals, carotenoids, and antioxidants that can help protect cells from damage.ecause it is a rich source of protein and other nutrients, spirulina has been used as a nutritional supplement. However, although spirulina contains a certain level of protein, you would need to take very large quantities to see any effect.