Spirulina is a natural algaeâ (cyanbacteria) powder that is incredibly high in protein and a good source of antioxidants B-vitamins and other nutrients. When harvested correctly from non-contaminated ponds and bodies of water it is one of the most potent nutrient sources available. take around 1-2 teaspoons total per day. Measure out the amount you need for each serving and add that much to your smoothie juice drink etc.