You can also, with a prescription, go to a compounding pharmacy and get testosterone cream, which is the most cost effective method of taking supplemental testosterone on a regular basis.

I'm not sure how about the half life for any single large dosage, and don't know the method used nor the dosage used in the anecdote given. And no, my ex did not repeat the experiment, nor do I recall her mentioning any controls being taken. I don't think the paper came from a scientific journal - knowing my ex, I'm sure of it. More likely the New Yorker.

There are studies about the effects of testosterone supplementation on mood and depression.