My doctor put me on Testim to correct low testosterone likely caused by my age. I saw only a negligible increase in the hormone, which might have been caused more by my doing more bicycling.
I hated its strong scent, which other people could smell on me, like cheap fragrance. You have to apply it to certain muscular areas of your upper body. Furthermore you can't apply it for an hour following a shower, nor shower for 2 hours afterwards. I found those restrictions interfered with my daily routine.
Last, it's rather expensive. It isn't covered on my Medicare plan, and to get the VA to give it to me could easily take a year of scheduling tests with them and waiting for appointments, with no guarantee they'd prescribe it for me. So I just dropped the whole idea.