Source Naturals Yaeyama Chlorella is 100% freshwater chlorella, grown on the coral reef island of Ishigaki, Japan. Chlorella is a green superfood, and gets its green color from the plant pigment chlorophyll. It is a non-GMO, pure algae that is a rare vegetarian source of true vitamin B-12. It is also a good source of iron and vitamin A and a complete vegetarian protein. Preliminary evidence, including some human research, suggests that chlorella may help support the health of the liver and immune system.*