Hey, I'm starting this thread just to try and find out if anyone has noticed any negative side effects tosupplementation. I started supplementing arginine a few weeks ago and have loved the pumps it has given me. I have also noticed some increase in vascularity. However, I recently got a cold so Im not really sure whether its being sick or the arginine causing problems. Just figured I'd toss the topic out there and see if anyone wants to discuss anything negative they have experienced or also the positive effects. Thanks for any help offered.