In the begining its boosts your energy level and u feel quite fresh whole day, specially for people who do office jobs which require long sitting hours, it helps u to come out from that lethargic phase. But as u go on with it, it sharts showing the nagetive effects.
I personally have used it for few months and what it did to my health was horrible. I started gaining more weight and the worst thing is when u stop using it, it leaves you with over weighted body and all your lethargic ness comes back.
It took me 8-10 months to loose the weight which I advesrly gained from proteinex.
Although Proteinex advertised as a health drink for everybody it is not. Donot take it as granted specially if u have a job for which u have to sit in one place for long hours. Instead do some yoga in the morning which will keep u fit and maintain your energy levels through out the day.