Hi. Well, that's no big deal for me if I tell you what I know. There are a number of common injectable steroids, some of which are able to directly mimic the effects of natural testosterone, while others will cause the production of excess testosterone in the body through interfering with the natural regulation system of hormones, both kinds of drugs, however, have the same end result. All of this information I found here http://uk-roids.com/injectable-steroids , and you can buy and read more, too.