
Originally Posted by
hooker
Testosterone is the basis for this number (100:100), thus tren's rating of 500:500 represents an anabolic effect of 5x that of testosterone and an androgenic effect of 5x that of testosterone.
The number is found by giving a measured quantity of the drug in question to castrated male winstar rodents, and then sacrificing them. Their levator ani (a muscle) and prostate are both weighed. The weight of the levator ani is used to determine anabolic effect, wheras the weight of the prostate is used to determine androgenic effect.