Isn't testosterone simply a byproduct of other hormonal processes? More of a measurement of effect than cause?
A smaller amount is from the pituitary in both men and women.
Depending on your weight there is an enzyme created in fat cells called aromatase which converts testosterone to estrogens which can have an impact on your overall hormonal picture.
Testosterone is derived in the body from cholesterol, which is way proper fat consumption is so important for a healthy endocrine system.
But I'm not sure what you're getting at. Trust me, inject 500mg of testosterone a week, you're going to notice changes.
Intramuscular testosterone is the most common method of HRT for trans men / trans masc folks.
The effects of which are not "androgen".
Every anabolic/androgenic steroid has some degree of androgenic effects. Researchers and pharma tried for decades to create a steroid that has no androgenic effects, to no avail. Even a 5mg dose of Anavar, one of the softest steroids that were actively prescribed for women, had androgenic effects.
Testosterone has a 100/100 anabolic/androgenic ratio. It's definitely androgenic. It will literally put hair on your chest. I don't know what point you're trying to make here.