Testosterone cypionate manufacturer?

There isn’t a single manufacturer. Testosterone cypionate is produced by many companies around the world as a generic injectable, and which ones are available depends on the country and the supplier.

If you tell me your country (and whether you want a brand-name or a generic), I can point you to current manufacturers and help you look up the approved producers. For the U.S., you can also check the FDA’s Orange Book to see which companies are currently approved to market testosterone cypionate injections.