It's a green pigment that gives plants their color and enables them to carry on the process of photosynthesis. Chlorophyll absorbs light in the red and blue-violet portions of the visible spectrum; the green portion is not absorbed and, reflected, gives chlorophyll its characteristic color. As a matter of fact, Chlorella contains more Chlorophyll per gram than any other plant. Because Chlorophyll has a chemical structure similar to Hemoglobin (the red pigment of blood), several scientists have suggested the use of Chlorophyll as a medical therapy for anemia.