I'll chime in here - I'm a 41 yo male who has been using both the testo 100 product and the power patch for about 3 months for testo and 2 months for power patch. I do not notice any effect of either except that I absolutely notce the rock like sleep and lucid dreams on the pp nights. I do not have baseline blood work from before I started using these products but I recently had a full work up including having both test and igf-1 tested for the first time.
The bad news is that my test levels were below range - 229 on a scale of 249-836 total and 6.3 out of 6.8-21.5 free-so I am now on the HRT path and will be dropping testo 100.
The good news is that my IGF-1 was very close to the high end of range 256 on a scale of 101-267. I have no idea if this is from the power patch but the doc did say that he never saw anyone of my age with such good igf 1 numbers and low test numbers so I will certainly stick with the power patch product.
Hope this helps.