Researchers investigated exopolysaccharides from Chlorella zofingiensis and Chlorella vulgaris for anti-colorectal cancer properties. The exopolysaccharides showed antioxidant activity and inhibited colon cancer cell growth. They contained various sugars and had molecular weights around 2.66×104 and 1.88×104 Da. The exopolysaccharides scavenged radicals effectively and reduced cell viabilities of human colon cancer cells by 18.0-28.3%. These findings suggest that exopolysaccharides from these microalgae could be potential agents for fighting colorectal cancer.