Chlorella is a type of green algae that contains more chlorophyll than any other know plant. One of the most nutrient-dense foods in the world, it contains an abundance of essential vitamins, trace minerals, antioxidants, essential fatty acids, and all of the essential amino acids. Chlorella promotes rebuilding and overall health and longevity. Scientists have found that Chlorella contains what they now term as "Chlorella growth factor" (CGF), which is a substance produced during the very rapid growth of the algae. Some believe that Chlorella may have been the "manna from heaven" described in Exodus 16.