Are you talking about HCG or HCGenerate? HCGenerate is something a lot of people use for PCT after taking a SARM. HCG basically keeps your balls from shrinking when running actual steroids(also mimics LH, so it can be good to take right before starting PCT after an AAS cycle). You shouldn't touch HCG when using SARMs, because HCG causes HPTA shutdown. Not shutting down is the main reason people take SARMs.