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Everyone should do as they see fit for themselves as studies on human biology is far from an exact science.
Indications for the use of human chorionic gonadotropic hormone for the management of infertility in hypogonadal men - PMC
Hypogonadism among men desiring fertility preservation presents a unique challenge to physicians. Over the past decade the number of younger men with hypogonadism has increased dramatically. These men are often treated with testosterone replacement ...www.ncbi.nlm.nih.gov
By the way just to let you understand how all these studies are very contradictory full of adversarial messages...Here below some abstract from the above link you just posted :
Finally, hCG has also been used to reduce some of the side effects of TRT, mainly preventing testicular atrophy and helping maintain response to TRT by “cycling off” TRT with a periodic replacement of therapy with hCG.
When planning for pregnancy in greater than 12 months TRT should be cycled off every six months replaced by a four-week cycle of 3,000 IU of hCG every other day.
For men who wish to obtain pregnancy within six months it was suggested to discontinue TRT and start 3,000 IU of hCG intramuscular, or subcutaneous every other day. SA should then be performed every two months. Clomiphene citrate 25–50 mg PO daily can be added or omitted to promote FSH production . We suggest including of clomiphene citrate in all men who are already oligospermic or azoospermic.
I couldn't agree more and it's exactly what I would do if I wanted to remain fertile. Stop testosterone for a while and start HCG only wich is the best procedure performed by endocrinologist to keep a patient fertile again.
But then this article also says :
in men who received TRT and 500 IU of hCG every other day an increase in intratesticular testosterone by 26% was observed . This proved that co-administering low dose hCG could maintain intratesticular testosterone in those undergoing TRT. It was later shown that not only is intratesticular testosterone increased with co-administration hCG but spermatogenesis is preserved as well at one year follow up (. These studies proved that by concomitant hCG administration with TRT spermatogenesis and thus potentially fertility could be preserved.
So as you can see, basically the same article says two different things
1) Best way to preserve fertility and mantain response to TRT is to cycling off testosterone and add HCG
2) They have seen that co-administering low dose hCG could maintain intratesticular testosterone in those undergoing TRT.
....and why do they say that ? Simply because each of us responds differently , something good for me it's not for you and vice versa.