First of all, no one has to trust anything. Second, anyone who knows a little about these substances knows that they're physiologically well tolerated, and pretty much harmless in very small dosages, as all available research indicates, especially psilocybin and bacopa monieri. Third, your analogy from the movie "Limitless" couldn't be further from the truth. There are far more dangerous and actually harmful smartdrugs like modafinil and Adderall that actually fit your description.