Yeah i'm confused though why Zip is on PF but not on NTBM. Odd.
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Honestly, ZIP wasn't a big seller for a long time because the concept was too advanced for most casual fitness people. It's difficult to get people to understand that it's the thyroid that burns fat, not the nervous system. But people like to feel that JOLT they get from stims. It makes them feel as if it's working. (ZIP has a slight energizing effect but not nearly as jacked up as the high caffeine products).
However, ZIP has slowly gained momentum and gotten more attention and now is one of proteinfactory's biggest sellers. Guys who are in it for the long run like the fact that the fast loss is more permanent.