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It's one of several androgens (male sex hormones) in females. If you thought testosterone was only important in men, you'd be mistaken. For example, the genitals may not enlarge, facial and body hair may be scant, and the voice may not deepen normally. A "feedback loop" closely regulates the amount of hormone in the blood.
It’s not uncommon for men to experience low testosterone levels. Everyone hits periods of low drive, even when hormone levels are in a healthier place. As your energy levels and focus improve, you may find you’re ready to take on more. Meanwhile, the same researchers found that men who received testosterone replacement therapy (TRT) experienced improvements in quality of life and increased motivation to compete for status. It’s deeply rooted in the brain, and testosterone may play a role in the systems that regulate goal-seeking behavior, reward anticipation, and stress resilience. Research continues to link testosterone to energy, mental clarity, and the drive to take action. Low testosterone can cause symptoms such as erectile dysfunction, reduced lean muscle mass, and low sex drive.
It helps determine who may qualify for therapy alongside symptoms; it does not mean every treated man should be driven to the same number regardless of response or formulation (Mulhall et al., Journal of Urology, 2018). There is no universal magic number that is ideal for every patient on testosterone therapy. If you search for testosterone targets on TRT, you will usually find a chart, a clinic range, or a single number presented as the answer. "You shouldn't focus too narrowly on nonspecific symptoms or a test result.
Blood levels of testosterone vary dramatically over time and even during the course of a day. Testosterone levels are too carefully controlled by the brain for that to occur. The proper balance between testosterone (along with other androgens) and estrogen is important for the ovaries to work normally.