Chlorella is a genus of tiny, single-celled green algae, especially species such as Chlorella vulgaris. Millions of people in Japan, and a growing number in the West, take chlorella every day because of its dense supply of a variety of nutrients and phytochemicals. It is grown and harvested in special tanks, and purified and processed by high-tech methods into powders, tablets, and other forms. Chlorella acts as an antioxidant and may have immune-boosting properties. It can promote wound healing by encouraging cell reproduction and tissue repair. Its beneficial effects on the heart include its ability to reduce high blood pressure and lower total cholesterol levels