Testosterone is critical for a woman’s libido (a healthy sex drive). Testosterone also aids in muscle, bone and skin growth and maintenance. Testosterone supports weight loss and improves cholesterol levels. Testosterone promotes a woman’s self-confidence, positive mood, energy and ambition. Each of these functions is equally important to women and men. In fact, relationships often suffer when one partner loses interest in sex. Unbeknownst to women, sometimes a hormone imbalance is to blame for their low sex drive.