Spirulina is a blue-green algae produced by photosynthesis - the natural process by which plants absorb energy from sunlight. Our Spirulina is high in Calcium, which helps maintain a healthy digestive system. These tablets are 100% pure with nothing added. The Chromium, Iron & Manganese in our Spirulina contribute to IMMUNE SYSTEM FUNCTION BLOOD SUGAR SUPPORT BONE & MUSCLE HEALTH This bottle contains a 30 day supply.