When do you see the effects of taking acai berry?

I have just started taking Acai berry as I have heard it is good for energy and speeding up your metabolism…. When do you see the effects of it…??? Has anyone had an experiences with it…. If so what are they?
May I just add that I have a very healthy lifestyle and am not obese and I exercise on a regular basis but am naturally curvy and not size 0. I thought if I was a little thinner I would love myself a little more and saw Acai berry as a slight confidence boost.

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