Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
But this article is different. It's not intended to grow big muscles on females; it's intended to give them the lean, athletic look. I know there are some females reading this who don't like the look that I portray in this article. I understand, and I've got plenty of other programs that will cater to your needs. This article was written based on the feedback from the vast majority of females who I've trained over the years. It's the look they paid me to give them, so now I'm passing on the information to you for free. You can't beat that!