mix with sterile water. doseage will depend on size of amp usually 2,000-5,000iu per amp/vial. for 2,000iu vials i add 100iu of water and inject 25iu per week (500iu of actual hcg). ofcourse use an insulin pin and inject sub-q. refridgerate after mixing, its good for well over a month in the fridge. expect an increase in sex drive, bigger balls. dont over do it; as in injecting large amounts at 1 time, this can desensitize the cells (leydig) that you are trying to stimulate. i feel hcg is used best on a cycle and not after in my personal experience.