I've been using natural testosterone creme for about six months for treatment of low testosterone. My levels were less than half the lowest normal range for a woman. I now feel like a completely new person. I have much more energy and endurance. And I have a libido again - something I'd not had for the past 7 years. I'm 39, and I think being on the pill for a mere 18 months 7 years ago totally messed me up.
Because I'm now able to train harder, I'm getting better results in the gym. However, I'm by no means packing on slabs of muscle, as I'm only using enough to put me in the normal female range. (My last hormone panel put me right in the low normal range, but what a difference in how I feel!)
Even if you're not a bodybuilder, all females need a sufficient level of testosterone for overall health. Compared to other forms of steroids, the pure test creme has lower anabolic (muscle building) properties and higher androgenic properties, which in high doses can cause sides such as voice changes, clitoris enlargement, excess hair, acne, etc. So for muscle-building, it wouldn't be a good choice, because you'd have to use a large dose which would certainly cause sides. At the dose I'm using, I haven't even gotten a pimple.
When I say "natural testosterone", I mean bioidentical in molecular structure to human testosterone. Because a naturally occuring substance can't be patented (and made $$ on), I have to get it from a compounding pharmacy, and they make it in a low enough strength for a woman. You can get test gels from a regular pharmacy, but they're made in strength for men, so you'd have to be careful w/ the dosing.
I highly recommend the book Natural Hormone Balance for Women by Uzzi Reiss. It's great for all age women, but especially those of us in our 30's and up.