Both HCG and Tribulus will make your body create Testosterone. Which in your case is good if you want to get your testicals back in gear. Im not saying that HCG would have been needed to prevent atrophy. You just may need it to get you kickin again. Tribulus is something you can get from any supplement store. It Raises your LH production natural which in turn stimulates Testosterone production. Just make sure you buy one of the major name brands. There is differnt parts of a tribulus plant that are used in supplements.