"Testosterone esters are less polar than free testosterone. Testosterone esters in oil injected intramuscularly are absorbed slowly from the lipid phase; thus, Testosterone Cypionate can be given at intervals of two to four weeks."
http://www.drugs.com/pro/testosterone-cypionate.html
"Testosterone Cypionate is simply testosterone which has undergone 17beta-estrification, to allow for a steady release over the course of about a week. Besides this difference (the ester), this form of testosterone will do what all others do."
http://www.*********.com/steroids/Te...Cypionate.html
"This medication is given by injection into the buttock muscle by a health care professional. It is usually given every 1 to 4 weeks or as directed by your doctor"
http://www.webmd.com/drugs/drug-5185...e+Cypionate+IM
Well, there you go since you asked.