The answer isn't up there. The answer is both during and after. Just a little bump every 4-6 weeks, 8 for my purposes, keep the testes big and bouncy. If you have a 12 week cycle you should use HCG for a 7-10 days in the middle. Then at the end. HCG is a wonderful tool for PCT it jumpstarts your testes to get them ready rumble again. So that when you start your clomid, nolva, arimidex, etc. The testes respond faster. To say you use it for PCT may be misleading for some people. PCT traditionally means what you use Post-Cycle. But HCG at the end is actually done in the last week of the cycle so it's not Post-Cycle in the truest sense because your using it during the last week.