Chlorella and Spirulina are blue-green algae produced by photosynthesis - the natural process by which plants absorb energy from sunlight. Our Chlorella is "broken cell wall" which increases the nutrients available for absorption. These tablets are 100% pure with nothing added. The Vitamin B12 & Iron in our Chlorella & Spirulina contribute to normal ENERGY YIELDING METABOLISM IMMUNE SYSTEM FUNCTION NERVOUS SYSTEM FUNCTION This bottle contains a 30 day supply.