Chlorella is a natural, green algae which harnesses energy from sunlight to fuel its growth. Chlorella cells have a tough outer wall, which limits the availability of nutrition. Our chlorella is cultivated and harvested in pure, freshwater pools. High-impact jets then break down the cell walls before it's dried into a naturally nutritious powder. The cell wall-breaking process does not damage the contents, but makes them more available for absorption. These tablets are 100% pure Chlorella.