I live in Honduras and don't have access to typical pharmacies or doctors, like in North America. I appreciate and serious responses. I am 51, was diagnosed with low testosterone and have been self-medicating ( no doctor supervision ) with one shot of Sustenon 250 every 3-4 weeks. I have been doing this for almost a year. I have not had any adverse effects other than shrinkage of my testicles. That has me a bit worried. Do I need to be taking and estrogen blocker in conjunction with Sustenon? If so, which one and what dosage? Do I need to have a period of time without any Sustenon? Can I take Sustenon once every 3-4 weeks for the rest of my life without any worries? Please help. Thanks.