is it possible to build up a tolerance within a few weeks of taking a product? the last 2 examples i have are i bought 2 bottles of prime and before that purchased neovar. both worked great but about the 3rd week or so all of that went away. i finished the bottle of prime and waiting 2 weeks to start the next one and no results from it. the urge to eat and keeping eating from it never came back, and with the neovar i was always feeling pumped while taking it but after a few weeks all that and the strength increases went away.