Below is a really great video segment on Testosterone and it's well done in my opinion. It really is a complex issue when it comes to acceptable levels. Personally I have always gone with what God has given me and not attempted to supplement my natural levels. However, as the years go by and I can see and feel the effects of aging, I have to admit that it is tempting to see what restoring former levels would do. Bottom line, I won't be using any T-replacement products beyond good nutrition and exercise, but it is interesting to think about. This is a long video, about 45 minutes, but interesting if you make the time. The segment on finger length ratios (index to ring finger) is interesting. I have heard of this before but wasn't fully convinced of it's validity. Interesting though.