Believe it are not you could used to get GHB caps a gnc. A buddy of mine used to home brew the stuff, he was a bb but big on partying. Supposedly he would take GHB instead of drinking or with maybe one beer and feel awesome. I believe it puts you into rem sleep lightning fast too, so theoretically you could sleep for 4 hours and wake up feeling like you had 7-8. GHB is also considered a date rape drug, and if you get caught with even just a cap full (average size soda cap) its considered a felony. I took it once in my early youth. Nothing special, taste like salt water, a little buzz then slept good similar Nyquil but was not drowsy when I woke up. The guy who used to home brew it sadly OD on coke in his late 20. He was jacked only slept a few hours a night so it does has some very appealing benefits.
Word of caution the main ingredient used to home brew GHB is highly regulated and the only way to obtain it is in extremely large quantities. which throws up red flags even if you do own a store, company that has a license to obtain it.
So with all that being said if used in moderation and your smart about it I think that It definitely could be used as a useful tool. Its just the people who abuse it that ruin it for the rest of us.