I've always found that I'm very stimulant resilient, so I end up needing double if not more of the recommended dose, which can make using them kinda expensive. in the past I've used MyProtein Pulse and USPLabs Jack3d, the latter of which I'd recommend - although it contains a banned substance, which is less than helpful when competing... ¬_¬
I also got a random free sample from the guys I bought Jack3d from of XCelR8 (yes, really...), which was also pretty good, but it tasted of diluted petrol.
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