I'm 2 weeks into my cycle, just test, I was curious if when your body is getting used to this new substance or and increase of testosterone can this lower your immune system briefly? I never get sick, as in colds, flu,etc. But from the start of my cycle I've had cold symptoms, ex.dry cough, stuffy nose, mild head ache, nothing I can deal with, I'm still able to go hard at the gym, but its getting annoying!