HCG will mimic LH and signal your testes to pump testosterone. But, HCG will also prevent your body from producing it's own LH, so it's actually keeping you shut down. The only times HCG should be run is during your cycle at low doses, or a quick blast before pct. It should not be run during pct, because as I stated, it will prevent the SERMS from doing their jobs of restoring natural LH.