How long would it take to shut down my natural test.. I'm taking test prop. 100mg EOD.. I'm getting gyno ithink.. i might just be getting paranoid.. I've been using test prop. for 8 days.. I was running l-dex and i just got some letro in, so i started using the letro yesterday.. I was thinking about stopping everything and using the letro to try to clear up my gyno.. Or will it go back down after i use the letro for a few days.. My nipples don't hurt or anything, they are getting puffier.