No HCG isn't recommended for treating hypogonadism, often times guys add HCG to TRT when first starting out and most start to feel better when they cut out the HCG.
A lot of guys use HCG for fertility, deal with the side effects, get the wife pregnant and stop the HCG.
HCG will still suppress your HPTA (LH/FSH). Jatenzo (oral T capsule) under the brand name Andriol in Canada is probably the only version of TRT that won't shut you down in the same way injections will, leaving LH and FSH in the low normal ranges.