First used by humans as a dietary supplement in the 16th century, Spirulina has the highest protein and beta carotene content in any green food, and also contains natural GLA (gamma linolenic acid). In addition, it is the highest known plant source of b-12 vitamin and has natural vitamins, minerals, trace elements, cell salts, amino acids and enzymes, making it an excellent all-natural protein food source that is easily digested and absorbed. Its unique phycocyanin improves lymphocyte activity, enhances human immunity, and has a positive effect on the recovery of patients with gastrointestinal diseases and liver diseases.