Organic Chlorella is a green single-celled microalgae rich in chlorophyll. Nutricost Organic Chlorella Powder delivers 3 g per serving in an 8oz bottle. Vegetarian, Non-GMO, Gluten Free and manufactured in a GMP-compliant, FDA-registered facility. Potential side effects may include diarrhea, nausea, gas (flatulence), green stools, and stomach cramping, especially during the first week of use.