Anyone Else Drink RedLine??

The past few days I've been finding it hard to complete my cardio because I've been really tired here lately..so my friend introduced me to this energy drink called "RedLine"...and I'm "hooked"...I had energy all through my workout and then some after....

Anyone else drink RedLine before they workout??

They sell it at my gym, and my trainer sips on it once in a while when he's wiped out.  I took the capsule form a few times, and the first time I had some extra energy, the second not so much, and the third all it did was make me flush bright red all over for an hour.  I assumed my body was just adapting to it, but I didn't want to keep increasing the dose, you know?  Don't see the point.

I've heard talk about it being dangerous, but anything can be if used improperly so I don't really put much stock in the warnings, but I'd still rather not continue using it if I have to have more and more.