The acai berry is a fruit in the acai palm tree. According to Wikipedia, acai berries are also known as red jackfruit, graham berry, kunzi and Brazil nut, and they’re available in several varieties with purple and black skin. It is a good source of vitamin C, both of which are essential to boosting immunity and overall health. Acai berries are a high antioxidant food with health benefits such as controlling blood cholesterol, preventing certain cancers and preventing diabetes.