I give it 4 stars because it's a decent cognitive enhancer but - pound-for-pound, dollar-for-dollar, rubble-for-rubble - Piracetam remains the superior smart drug in my view. I'd suggest that biohackers

...it's gold for complicated logical problem-solving. If your billable rate is over three figures hourly, you watched Star Trek growing up, and you have a StackOverflow account, Phenylpiracetam is probably

Another Russian Racetam, derived from the Czar of Nootropics Piracetam. It's regarded as the mathematician's smart drug for the powers of cognition it stimulates. It's a hardcore Biohacker's smart drug.