Like LordKat said it depends on how you are taking your T and what type of T you're taking. Creams, patches, pellets, injections. Enanthate , Cypionate, Propionate, just to name a few options. It depends on your needs, your Dr should have told you when putting you on T, if not then you seriously need a new Dr. Your Dr will also monitor your blood levels too and possibly change the type, method or dosages depending on the results.