Spirulina is a blue-green algae that grows in fresh water lakes throughout the world. Spirulina is 60% protein, making it the world’s highest known source of protein. The protein in Spirulina contains all eight essential amino acids, making it a complete protein. As with most green foods, it is an excellent source of vitamins. In addition, Spirulina provides all necessary minerals, trace elements, cell salts and digestive enzymes.