Oxymetholone is without a doubt the strongest and most visibly active steroid to date. Not only does it act very rapidly, it causes a virtual explosion of mass. Gains of up to 10 pounds in 2 weeks are not uncommon. This is largely due to a moderate to low androgenic effect combined with a high anabolic activity also mediated by non-AR mechanisms (mechanisms other than simply binding the androgen receptor). You can imagine that the gains made on oxymetholone aren't the leanest. You would note a drastic smoothing out of the muscle due to estrogen-related fat (lipolysis) and water retention. This lipolysis has been shown to be rather drastic. One study1 on long-term hemodialysis patients showed beyond a doubt the role that oxymetholone can play in causing hyperlipedemia. The fat deposition rate, post-hepatic (after processing by the liver), increased drastically in the oxymetholone group while numbers remained stable in the control group.