Depends on supp.: There are many pre and post workout supplements. I imagine many of the pre-workout supplements contain caffeine and thus are best avoided if you are sensitive to caffeine; but there are probably some that don't have caffeine so check them out. Generally if you are jittery after any supplement i would take it as a sign that it is not a good fit for you and you should find one that does not do this!
Answered 3/16/2014
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