HI A.,
Nutrition is the key to weight loss. Acai has nutrition but no more than a lot of other foods. It has antioxidant qualities but according to the documented research that I have, the super juices, Acai, Noni, and Goji, have less antioxidant qualities than Welch's grape juice. Organic grape juice has tons more.
I always advise an absorbable multivitamin/mineral complex. My husband lost 110 pounds with me simply getting him healthy. The first 60 pounds he dropped with no activity change and no diet change. He decided to put it into high gear and lost the additional 50 pounds with the vitamin and exercise. (After he started losing the weight, his best friend tried it and lost 50 pounds himself.)
There is no quick fix to weight loss. The body balances itself if it is healthy and that has to come from nutrition.
Hope I helped!
M.