I totally agree with muskate and had to learn it the hard way.
I followed some broscience protocol and it did farm more harm than good. The mods here have by far some of the best knowledge when it comes to AAS compared to other forums out there, so use the search function and read all you can about HCG. I thought I needed it too while on TRT but the only thing it did for me was preventing my balls for shrinking.