Please call Chip -- big red box to your right.
Most people who have used the gel think it sucks ass. And, it's very expensive. It's a PITA to apply and you always have to worry about it transferring to your woman or sweating it off in the summer.
Most traditional docs will not write you a script for injectable testosterone cypionate. Some will, but most are very hesitant. An Hormone Replacement Therapy (HRT) clinic will work with you to get you whatever you need to get your test levels back to normal.
The beginning of a testosterone replacement therapy (TRT) program is a one-way trip for most of us. There is no "going back" because our bodies couldn't produce enough of it on our own -- hence low test scores. Once you start taking it the negative feedback loop shuts down whatever is left of your natural production once your blood levels of test reach a symbiotic level. The body simply recognizes enough test in the blood stream (or a surplus) and shuts down production.
The only people who are able to stop using test after a period of time on a testosterone replacement therapy (TRT) protocol are people who had outside factors that were causing their levels to be low in the first place. Mitigating factors, like illness, or obesity. If you're obese and it is a contributing factor to your low test then diet, exercise, and a short term testosterone replacement therapy (TRT) program followed by a PCT program running some hCG might allow you to return to normal, natural testosterone production levels and enable you to get off TRT. The odds are pretty slim, but some people are successful.