||MedlinePlus Supplements: Acai, pronounced AH-sigh-EE, is a palm tree that is widely distributed in the northern area of South America. Its berries are used to make medicine. ... As a food, the acai berry is eaten raw and as a juice. The juice is also used commercially as a beverage and in ice cream, jelly, and liqueurs. In manufacturing, acai berry is used as a natural purple food colorant.