test is the base for most seroius body/builders stack..the difference between them being the esters that release it into the body,cyp has the longest lasting ester meaning you can get away with fewer injections,uaualy one per week...as it lasts a long time front loading is usualy the recommended method...if using on its own you should get good gains 300 to 500 mgs first couple of weeks, decreasing dosage the following weeks...your body will shut down its own production so a good pct is needed..as to gains depends how good your eating,training plan is..conversion to estrogen could also be a prob( varys with dosage & person to person ) if you start getting probs ie,bloated,acne,bitch tits...(this will uaualy start with sore lumpy nipples) take some novledex or similer anti estrogen tab...the better your coming of plan the more you will keep..