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.
Equipoise – Boldenone Undecylenate (Bold200, Boldenone, Baldebal-H)
Ciccone Equipoise Combo450 (See Boldenone esters: Undecylenate, see Cypionate, Acetate)
Primabolin Tabs – Methenolone Acetate
Primabolin Depot – Methenolone Enathate (Alphabolin, Primabolin Depot)
Masteron100 – Drostanalone Propionate
Masteron200 – Drostanolone Enanthate
Winstrol Depot – Stanozolol
Winstrol Tabs – Stanozolol
Oxandrolone – Oxandrolone (Anavar)
How do you protect yourself against this? Well, when taking Deca Durabolin you can also take ant-estrogen medications to counter the results. Things like Nolvadex and Arimidex are popular choices. Both approach limiting the effects of estrogen different and will have different side effects on your health worth considering. Even with side effects though it is still worth pursuing either of these options. Gynecomastia is a particularly big problem due to how the imbalance between estrogen and progesterone is what leads to gynecomastia. So, by keeping your hormone levels regulated, you reduce the risk of potential unwanted growth.