but when jeff and cofounder michael brant brought it on the show. >> it scares the hell out of no.t's what people use to go on 48-hour coding binges. at the end of the day you're left with a headache, lack of consequences so i'm alter brai nootropics are not labeled a drug, but as supplement. meaning they don't need fda approval. nootropics are not fdain we do generally regarded as safe, which is the highest level of things one can consume. >> does it ever concern you thi make them unsafe? >> no, because that's where our science of actually practicing doctors and called date any cross-indications. >> despite this ion nootropics side effects, many citing lack of studies abouton impacts. >> there may be one of the many ingredients on there that may reac w medicines or something else. that's why we always recommend discussion and approval by the >> reporter: it's not just the tech world these little life optimizers. entrepreneur swears by them. >> it does sustain the speed i'm going at now. i'd have to take a couple things off my plate if i wanted to keep going without them. >> report

but "shark tank" didn't bite when jeff and cofounder michael brant brought it on the show. >> it scaresell out of me. i've tried nootropics. that's what people use to go on 48-hour coding binges. at the end of the day you're left with a headache, lack of recall sometimes. i'm worried about the long-term consequences so i'm out. >> reporter: although they're said to alter brain function, nootropics are not labeled a drug, but as a type of dietary supplement. meaning they don't need fda approval. nootropics are not fda approved >> everything we do use is fda, generally regarded as safe, which is the highest level of safety the fda gives for all things one can consume. >> does it ever concern you the mixture of these things could make them unsafe? >> no, because that's where our science team, which consists of actually practicing doctors and ph.d.s, walk through that and validate any cross-indications. >> despite this confidence, some caution nootropics could have side effects, many citing lack of studies about long-term impacts. >> there are also interactions. there may be one of the many