Spirulina is a natural “algae” (cyanbacteria) powder that is incredibly rich in protein and a good source of antioxidants, B vitamins and other nutrients. When properly harvested from uncontaminated ponds and bodies of water it is one of the most potent nutrient sources available. It is composed largely of proteins and essential amino acids, and is generally recommended to vegetarians because of its high content of natural iron. Even for those who consume meat since it has a highly absorbable form of iron that is mild in the digestive system. The high concentration of protein and iron also makes it ideal during pregnancy, aftersurgery, or anytime the immune system needs a boost. This seaweed is also incredibly high in calcium with more than 26 times the calcium in milk.