This is actually a rumor, and I've heard it before (back in like 2010).
It's nothing, more than likely it started from someone who either is so skeptical about piracetam, that they figured they could get others to stop taking it with this. I'm honestly not sure where the rumor started or how, and the prior statement is a mere speculation.
I ordered some piracetam, from smartdrugsforthought.com, just last week and received it with absolutely no problems. I'm thinking maybe Piracetam isn't "Approved" by the FDA and that's what has got people saying that it is banned.
If you look on the side of almost every supplement bottle you will see "This statement has not been evaluated by the FDA, this product does not cure or prevent diseases" blah blah blah. So I'm guessing someone figured when they heard that Piracetam wasn't approved (again an assumption/speculation of mine) that it was banned and thought "I MUST TELL ALL!!!!"
lol some people will believe anything.