Acai berries, Goji berries, Noni Berries, it's all b.s.
Basically someone takes a fruit that's cheap to produce and is just as healthy for you as a cranberry or blueberry but it comes from a "mysterious" and 'far away" place in the world where amazingly the people live to 120 years old!
Worse yet, most of the time they take a berry that has a horrible taste and that has been generally considered a pesky weed for centuries and the crush it all up or blend it with sugar and TA-DAH a "miracle" juice or pill that will save your life.
Hmm... Noni, Goji, now Acai... I wouldn't be surprised if the same con artist is behind all of these.
Believe me, at one point we had a bunch of people asking us to design their websites for them to sell Acai berries, Goji berries, miracle juices etc etc. They are all pyramid schemes. They all promise weight loss and longevity for a mere, $40, $60, $80 dollars a month. They'll flatten your tummy, cure your cancer, improve your brain functionality etc. Then when you complain of no results they'll say it's because you need to supplement your Acai juice with Acai pills that run you "only" 1 dollar a pill -- except that to get "full benefit" you have to have 3 pills a day, so within weeks you're finding yourself spending $100s a month on SUGAR.
Even if these berries do actually do anything for you, your money is better spent getting real blueberries than powdered acai. The antioxident properties of berries are broken down with heating and processing, so you're best to get the real thing fresh or flash-frozen.
I get a million spams a day offering me Acai berries, if you check your junk box you've probably got them too. Buying off of one of them is going to give you the same result as buying Acai berries at the store -- absolutely nothing of benefit!
Want miracle anti-oxidents? Better off ordering frozen blueberries / raspberries / blackberries from the guy in Patagonia -- I'm sure it was mentioned on this site somewhere -- someone will have their info. You can also buy frozen blueberries at Jumbo.