OK, according to "Building the Perfect Beast", roids have half lives and "active lives". I know where to find half lives of gear, but not "active lives" of all gear. For example, test enanthate has an active life of about 14 days. (i think) Therefore the acitve life peaks at day 7 and falls off at about day 14. This is the kind of info I'm looking for. Now if half life can be closely related to active life, as for as total time, then you could simply look at the half lives and divide by 2 to get the peak active life, but I don't know if that would be correct. That's why I'm here and asking. thanks, pins