Is it possible to restore fertility and remain on trt? i'm 35 and would hate to give up the benefits trt has provided. is adding hcg or clomid (clomiphene) ok?

Testosterone therapy: If you're referring to testosterone replacement therapy, any exogenous testosterone - gel, shots etc. - that's not made by your testicles will depress your sperm production. If you want to have a child then you should stop testosterone and get a hormonal evaluation and semen analysis off the testosterone. Some men benefit from aromatase inhibitors like anastrozole. A few need HCG and fsh shots.