Chlorella is a 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 chlorella with nothing added. The Vitamin B12 & Iron in our Chlorella Tablets contribute to normal energy yielding, immune system and nervous system function. Chlorella is naturally high in protein and minerals, making it a great natural support for your body.