I am a 35 year-old male who has been using Testim about 3 months due to having a testosterone level around 300 and very low sex drive. I would second Thomas' comment that there was an intense effect in libido and (in my case) aggressiveness the first 3 weeks of using the 50mg daily dosage, somewhat dropping off after that point. <br> <br> I would also second Thomas' comment that, in the gym, after "plateauing" with the amount of weight I could lift before Testim, I found I could suddenly lift more - and more - and more. I have been pushing myself HARD at the gym, and it definitely shows in increased muscle mass and in losing 1-2" in my waist, without losing any net poundage.<br> <br> I've also experienced a HUGE increase in appetite with Testim. I am trying to keep eating healthy rather than gorgig on everything in sight. (By contrast, a friend of mine, who started TRT about the same time I did, has not gained any muscle but he's added a 10-15# pot belly.)