Fresh blueberries (Vaccinium spp.) are deeply pigmented berries rich in anthocyanins, the polyphenols responsible for their blue-purple color and many of their distinctive biological effects. Blueberries also provide fiber, vitamin C, vitamin K1, manganese, and a diverse mixture of flavonoids and phenolic acids, including quercetin and chlorogenic acid. Human clinical research has linked regular blueberry consumption with improvements in vascular function and some aspects of cognitive performance, making blueberries one of the most extensively studied berries for cardiovascular and brain health. Their naturally sweet flavor makes them easy to enjoy fresh or frozen in breakfasts, smoothies, salads, snacks, and desserts.