Chlorella is a single-celled freshwater algae. It reportedly contains a very high amount of chlorophyll and is a rich source of vitamins and minerals. Chlorella is the world's most researched food product and is the finest, broad spectrum dietary supplement available today. A number of companies market chlorella products, some of which contain substantial quantities of contaminants such as mercury and aluminum. In contrast, chlorella from Prime Chlorella is virtually devoid of toxic metal contamination Serving Size: Start with 2 tablets 3 times a day. Increase gradually to 15-30 tablets daily. Chlorella is a natural food. Serve for snacks, dissolve in water for drinks.