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.
PLACENTAL TROPHOBLAST DEVELOPMENT AND VASCULARIZATION During human and nonhuman primate pregnancy, the placenta simultaneously accesses the maternal blood and develops a vascular network for the transport of nutrients to and waste products from the fetus across the syncytiotrophoblast to ensure fetal growth and development. Both processes depend on the ability of the primordial stem-cell cytotrophoblasts to take either the villous pathway where they remain in the fetal compartment and differentiate morphologically into the syncytiotrophoblast or the extravillous pathway where they proliferate, aggregate into cell columns of the anchoring villi, and invade the endometrial stroma (Fig. 6). 105 The syncytiotrophoblast covers the floating chorionic villi that become highly vascularized, whereas the extravillous cytotrophoblasts infiltrate the walls of the spiral arterioles to facilitate the process of placentation.
If you implement a Dianabol cycle, there is a crucial factor you need to understand. While Dbol is one powerful anabolic steroid , it is not a magical pill. If you supplement with Dianabol, it’s not going to automatically make you big. Granted, your strength will go up, but how big you get will be dependent on one thing and one thing only; food. If you do not eat enough to meet your growth needs, you’re not going to grow. Conversely, if you do eat enough to grow and you add in Dianabol, you will grow more than you would have otherwise. This isn’t rocket science, but for some reason, it is a concept lost on most. It is also necessary to note, if you are running a Dianabol cycle this does not mean you should eat like a pig. If you gorge and eat as if there’s no end in sight, Dbol or not you’re going to get fat. The rules of nutrition do not change just because you’re supplementing with anabolic steroids.