Not quite. A good way to think about it is that the main purpose & effect of HCG is to "prime" the testes for production, which will do a good job of keeping spermatic production up during TRT or recovering to normal function quicker after TRT in a joint PCT treatment.

It doesn't dramatically increase or preserve your own Testosterone production, because that is based on your own production levels. A boost to a low Testosterone value by percentage is still going to be low, if you naturally just produce a low amount.

So you have to hone in on what your goal is. Are you looking for more effective TRT? Then you just raise your T dose slightly, this will always out-perform HCG. Are you looking to maintain spermatic production and actively trying to conceive a child while on TRT, or some time in the very near future? Sure, that's one valid reason to run both.

We would never advise someone to run HCG with their Testosterone outside of *immediate* fertility concerns for two reasons: It's incredibly expensive when made in the USA & it's just not very effective. It's not really going to hurt you, but it's not going to do very much of anything other than spend your money. You may have companies advise it, but I would be wary that it's not just to get you to spend more money with them.

That said, if someone wants it for cosmetic sake (they don't want their testes to reduce in size by ~25%, though your partner is never going to notice or care unless it's their kink or something) or they are just convinced it's right for them, and are willing to pay for it, we won't stop them.