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I use C4 & a BCAA. I use till the servings done (30 days), then take 3-4wks off to let my body adjust so that it doesn't become dependent on the pre-workout for energy.
Plus who really knows long-term effects lol
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'07 Montego Blue/Saddle Brown E92 335i - 6spd. - SOLD
'16 Carbon Black Metallic F10 535i M-Sport - TOTALED 11/21/21 
'13 Black Sapphire Metallic F30 335i M-Sport - unknown charge pipe, MSport Exhaust, 20" 405M wheels, $61k MSRP, CF M4 Mirror caps & Spoiler, NGK plugs, Dinan Coils, BMS intake |