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Old 01-14-2013, 11:59 AM   #3
Silversixspeed
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Join Date: Sep 2012
Location: Eden Prairie, MN
Posts: 85
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I've used C4 before, I don't remember any bad side affects. Worked pretty good for me!

But I agree, if you are getting some headaches and whatnot, I'd guess it's the caffeine.
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