HCG helps keep your leydig cells from atrophying. Leydig cells in your gonads are responsible for testosterone production so once PCT comes around you want them to be ready to produce testosterone once the signal is sent from your pituitary. If you want you can pin the hCG IM in the same syringe as your testosterone. The only thing is the measurement isn't going to be as accurate had you been using a slin pin. Nonetheless I would rather pin the hCG IM than not at all. Get the hCG, include it and run it. Recover quicker and enjoy your gains.