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My friend who takes it for "hardcore" focus and doesn't really need it, can work like 18 hours straight on it. She gets fixated on what she's doing, and doesn't want to stop.
I tried it, and it had nothing at all to be the same effect on me, and I didn't really notice that I could focus better. I think I only tried it for like 3 days though, once it didn't help, no reason to keep taking it. Plus, I really do love my sleep at night.
Medicine is bad, avoid it all if you can. =)
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