Blueberries (IMAGE) University of Cincinnati Caption Blueberries have a high level of an antioxidant called anthocyanins that defend the plants from threats and can provide benefits to humans like improved metabolic function. Credit Photo courtesy of Unsplash Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.