Social isolation has a hindering effect in AHN whereas normal regulation of androgens increases AHN. A study using male rats showed that testosterone may block social isolation , which results in hippocampal neurogenesis reaching homeostasis —regulation that keeps internal conditions stable. A Brdu analysis showed that excess testosterone did not increase this blocking effect against social isolation ; that is, the natural circulating levels of androgens cancel out the negative effects of social isolation on AHN. 
The great news is that, like John, patience is the answer. Except, even BETTER, is that I never went on medication. We just kept trying and using lube and one day he suggested we watch porn together. And since that day I’ve felt like my 16-year-old self (I’m 24 now). Yes it sucks and, if you haven’t taken Accutane, then don’t. But to those who have, don’t worry. All is not lost and it’s not permanent!! Just don’t give up. Because giving up is giving in, and you are NOT going to accept a life with no libido!! You can do it 😉
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.