What we known about the Acai health benefits, backed by scientific research into the fruits properties, is quite substantial.  Acai is a rich source of anthocyanins and other phenolics and phyto nutrients.
Acai berries fruit are amongst the most nutritious foods of the Amazon, rich in minerals, B vitamins, proteins, fiber and omega-3 fatty acids. Acai fruit also contains omega-9 (oleic acid), a beneficial fatty acid (often mistakenly referred to as essential).

Minerals in Acai Berry: Acai is rich in copper, and unusually high in manganese. Potassium is also the mineral most abundant in the Acai. Only a small portion supplies far more than the your body needs of this ultra trace minerals.

Acai Phytonutrients: Anthocyanins are compounds that have potent antioxidant activity, allowing for the neutralization of potentially harmful free radicals.
A powdered preparation of freeze dried acai fruit pulp and skin was shown to contain anthocyanins (3.19 mg/g); however, anthocyanins accounted for only about 10% of the overall antioxidant capacity. The powdered preparation was also reported to contain twelve flavonoid-like compounds, including homoorientin, orientin, taxifolin, deoxyhexose, isovitexin, scoparin, as well as proanthocyanidins (12.89 mg/g), and low levels of resveratrol (1.1 μg/g).

Extracts of acai berry seeds were reported to have antioxidant capacity against peroxyl radicals, similar to the antioxidant capacity of the acai pulp, with higher antioxidant capacity against peroxynitrite and hydroxyl radicals.