Originally Posted by NetHorse

Please do not do that man.

Hormonal replacement therapy, (HRT, or TRT) is not something you fuck around with. You will create an even worse imbalance if you go out and get just one shot of test without committing to a dosage and regimen.

When bodybuilders take it, they take high doses for 10-12 weeks followed by a SERM, (Selective Estrogen Receptor Modulator) which jump-starts their endocrine system to start producing natural testosterone again. When you supplement your body with testosterone from an outside source it 'shuts down' your natural test production.

Someone with a testosterone deficiency would take a small weekly dose to be within normal range. Generally it's a long-term commitment or in cycles determined by your endocrinologists depending on your health and other factors.

If you take just one shot, you will be fine for one week, (roughly the half life of a shot of test) and then you will SHUTDOWN.

Go see your primary, have him refer you to an endocrinologist, get your levels checked then discuss the advantages of doing hormonal replacement therapy. It is not something you just go out and try because you're feeling sluggish.