FWIW, This forum is great for giving ideas for 'detective work' and discovery. So I'll relay a bit of my experience in the hope it helps you find an answer. I was hypogonadal before starting treatment [200-250], but without any loss of libido or erections.
I started with intramuscular...
I take 3 grams a day and have been using Niacin for 25 years. I enjoy the flush, it relaxes me, creates better hardons--they're gonna have to come up w/ more a couple biomarkers to dissuade me from the benefits I FEEL immediately.
My HGB and HCT were problematic with intramuscular injections. Even after frequent blood donations it kept rising to peak at 18.5 and 53. I switched from .7 ml of 100 testocerone cypionate IM to .5 subQ injections every 5 days, eat 1/2 a grapefrut every day, switched bp meds from Lisiniprol...