Last month, I tried my first testosterone boosting supplement. I used one cycle of Animal Stak, which is 21 days on, then one week off. I noticed an improvement in mood and energy levels. I did feel a bit more aggressive, but not 'roid-rage type of stuff. I noticed some strength gains, as well as some extra energy in my pants. I just started a new cycle of I Force Tropinol, at the suggestion of the nutrition store guy. Seems to be working after the first pill. As a 37 year old guy recovering from a spinal cord injury, I'm willing to give this stuff a shot, to get as much strength back as I can. I'm concerned about long term issues, but willing to take the risk. From what I understand, this stuff isn't as potent at Pro Hormone (PH) stuff. I've heard these types of products are less useful for younger guys who already have good natural test levels. I'm also not aware of how these fit into the rules of "performance enhancement" substances in regards to bike racing rules. I didn't see anything on this topic here on the monkey, so I thought I'd open the subject up for discussion.