Self-injected testosterone is least cost and he can use #29 1/2" 0.5ml insulin syringes, injecting SC/SQ, not IM.
From what you have stated, sounds like he is using a T-gel.
Where are you located? This affects diagnostic and treatment options.
TRT shuts down his HPTA and LH/FSH-->zero that typically leads to smaller softer testes and fertility is a risk. That can be counteracted by injecting hCG, which costs more than T, or taking a low dose SERM, which is low cost, but not a natural human hormone.
It would be useful if he was here and posted his pre-TRT labwork and more info. Also describing what form of TRT, doses and timing.
We often see thyroid function issues with young and older guys who come here with low-T. Please see the last paragraph in this post, might also apply to you.
Please read the stickies found here: https://forums.t-nation.com/t/about-the-t-replacement-category/38/2?u=ksman
- advice for new guys
- things that damage your hormones
- protocol for injections
- finding a TRT doc
Evaluate your overall thyroid function by checking oral body temperatures as per the thyroid basics sticky. Thyroid hormone fT3 is what gets the job done and it regulates mitochondrial activity, the source of ATP which is the universal currency of cellular energy. This is part of the body's temperature control loop. This can get messed up if you are iodine deficient. In many countries, you need to be using iodized salt. Other countries add iodine to dairy or bread.