Test e = Testosterone Ethanate, ester half life is 7-10 days
Test c = Testosterone Cypionate, ester half life is 7-12 days
Test p = Testosterone Propionate, ester half life is 3-5 days
Doses have to be adjusted according to how long it lasts in the body. A mild cycle of test e or test c would be 300-400mg/week, and a cycle of test p would be 50-100mg eod.