Aug 08, 2011 2:56 AM GMT
I don't really use pre-workout supplements because most have caffeine in it and my body doesn't really like caffeine. I workout in the evenings also and the caffeine affects my sleep. I'm curious to know how long it takes for the body to flush out the caffeine from the pre-workout supplements. What I've been doing is taking l-arginine to help with NO production but it doesn't really produce a pump like the pre-workout supplements. I may just cut this out of my supplements entirely because of the caffeine. Thanks for any feedback.