Testo gel, or whatever it is called these days, is a very myopic and short term solution. Testosterone replacement therapy is a very complex subject and many things need to be balanced or the downsides to taking a testosterone supplement on it’s own can be worse than expected. It is far from a magic wand fix.
In most cases it is Free Testosterone levels that you want to be concerned with, not just T levels on their own. Taking Testo gel can be like using a sledge hammer to insert a drawing pin into a cork board, or conversely like trying to drive a metal spike into concrete with a wooden spoon. It is never accurate enough to provide the exact correct dosage of Testosterone any one individual specifically requires.
The best way to increase your Free Testosterone levels is diet, exercise, and lifestyle, but if you do go down the route of testosterone replacement therapy, then daily injections of the correct micro-dose of testosterone are best, and these need to accompanied with daily injections of the correct micro-dose of HCG (Human chorionic gonadotropin).
HCG will help to control testicular shrinkage and plays a part in the raised oestrogen levels, both of which will always occur when receiving an external testosterone supplement. Increased oestrogen can have the opposite effect of what you are looking for and cause male breast tissue to increase. It’s worth noting though, that the NHS will not prescribe any of this type of treatment outside of simple Testo Gel. Without incorporating HCG as part of a daily routine of Testo gel, you will start to notice testicular shrinkage since your endocrine system will no longer be telling your testicles to produce testosterone, so they become dormant and shrink.
My advice is to look for alternatives if possible, especially testosterone replacement therapy.