I have done a test with a juice containing highly condensed acai berry extract along with other fruits. Some people claimed it was supposed to help for everything and I never believe in such statements.
Still I have tested the juice on myself for two weeks and I must admit that my skin condition and especially hair become in much better shape. I think it's great when you need a natural vitamin and antioxidants boost.
I haven't observed any weight loss during that period, and the energy level was a bit increased but not significantly.