Free testosterone is the unbound, active form of testosterone that is readily available for the body to use. It makes up only about 2-5% of the total testosterone in the body, while the majority (around 98%) is bound to proteins like sex hormone-binding globulin (SHBG) and albumin. The key positive effects of free testosterone include:
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Impacts the growth and expansion of muscle tissues and bones, giving a more masculine appearance 1
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Enhances mood and helps maintain good energy levels, sex drive, fertility, and metabolism 1
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Allows testosterone to connect with and activate testosterone receptors in cells, regulating vital functions like metabolism 1 2
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Promotes the development of male secondary sexual characteristics like facial/body hair and a deeper voice 2 3
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Contributes to bone strength and muscle mass in both men and women 2
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Influences sexual desire and may impact mood and cognitive function 2
In summary, free testosterone is the biologically active form that can directly bind to and activate testosterone receptors, leading to a wide range of beneficial effects on the body's growth, development, and functioning. Maintaining adequate free testosterone levels is important for overall health and well-being. 12345
Citations:
[1] https://www.advantageja.eu/supplements/what-is-free-testosterone-role-and-how-to-increase/
[2] https://www.rupahealth.com/post/what-is-free-testosterone
[3] https://ro.co/erectile-dysfunction/free-testosterone/
[4] https://www.greatgreenwall.org/supplements/free-testosterone-importance/