Testosterone, often thought of as a male hormone, plays a crucial role in bone formation in both men and women. It is the most abundant biologically active hormone in your body, even compared to estrogen. It helps you wake up, provides you with energy, improves libido, supports the immune system, builds muscle mass, and helps maintain bone density and strength. Deficiency in testosterone can lead to a weakened immune system, mood issues, low libido, a decrease in muscle mass, weakened bones, and an increased risk of fractures.
How does testosterone work in bone formation? Testosterone stimulates the production of bone cells known as osteoblasts, which help build and repair bone tissue. It also inhibits osteoclast activity, cells that break down bone tissue. This balance between bone formation and resorption is essential for maintaining strong and healthy bones.
In males, testosterone is primarily made in the testes, specifically in specialized cells called Leydig cells. These cells produce over 95% of the testosterone in men, with the remaining small amount (about 5%) produced by the adrenal glands located on top of the kidneys.
In women, testosterone is produced in the ovaries and adrenal glands, and it is converted into estradiol, a form of estrogen, in the body. Estradiol is known for its role in bone formation and maintenance, but testosterone also contributes to this process. The relationship between testosterone and estradiol is complex and intertwined. Estradiol helps regulate testosterone production, and testosterone can be converted into estradiol in the body. Both hormones work together to support bone health and overall well-being in women.
In postmenopausal women, when estrogen levels naturally decline, testosterone becomes even more important for maintaining bone density and strength. Research has shown that low testosterone levels in women are associated with an increased risk of osteoporosis and fractures. Unfortunately, testing of testosterone levels, particularly in women, is not routinely performed even with symptoms of low testosterone and is not generally supported by insurance.
Signs and symptoms of low testosterone include fatigue, decreased muscle mass, decreased libido, erectile dysfunction, and mood changes. If you suspect you have low testosterone, it is important to seek medical advice to determine the underlying cause and develop a treatment plan. It is important to rule out other conditions, such as hypothyroidism, which may also have similar symptoms.
When testosterone levels are low, the balance between bone formation and resorption is disrupted, leading to decreased bone density and an increased risk of osteoporosis. Low testosterone levels also contribute to muscle weakness, fatigue, and decreased physical performance. Both free testosterone and estradiol levels, as well as testosterone-to-estradiol ratios, are used to assess hormonal balance in men and women. In addition to hormone testing, other metabolic tests, complete blood panels, and nutritional testing can point to issues that may contribute to low testosterone levels.
There are several factors that can cause low testosterone levels, including aging, chronic illnesses such as diabetes or obesity, certain medications, and genetic disorders. Stress and poor lifestyle choices, such as lack of exercise, poor diet, and excessive alcohol consumption, negatively impact testosterone levels, even prior to middle age.
Fortunately, there are natural ways to increase testosterone levels. Regular exercise, particularly strength training and high-intensity interval training, can help boost testosterone production. Getting enough sleep, reducing stress, and maintaining a healthy diet rich in protein, healthy fats, and vitamins and minerals can also support healthy testosterone levels. Avoiding endocrine disruptors, such as plastic drinking and cooking utensils, is important.
Supplements such as vitamin D, zinc, and magnesium have been shown to help increase testosterone levels. However, it is important to consult with a healthcare provider before starting any new supplement regimen, as some supplements may have side effects or interactions with other medications.
Managing low testosterone levels involves addressing the underlying causes, such as adjusting medications, managing chronic illnesses, and making lifestyle changes. Hormone replacement therapy may be recommended in some cases, but this should be done under the supervision of a healthcare provider to minimize risks and side effects. Unfortunately, at this time, there is no FDA-approved testosterone replacement for women.
In conclusion, testosterone plays a key role in bone formation and overall health. Maintaining healthy testosterone levels through lifestyle choices, supplementation, and medical intervention when necessary can help support bone health and prevent the complications associated with low testosterone.
References:
Swislocki ALM, Eisenberg ML. A Review on Testosterone: Estradiol Ratio-Does It Matter, How Do You Measure It, and Can You Optimize It? World J Mens Health. 2025 Jul;43(3):453-464. doi: 10.5534/wjmh.240029. Epub 2024 Aug 30. PMID: 39344113; PMCID: PMC12257316.
Tian X, Zhang B. The association between sex hormones and bone mineral density in US females. Sci Rep. 2025 Feb 14;15(1):5546. doi: 10.1038/s41598-025-89985-z. PMID: 39953073; PMCID: PMC11829004.
Rojas-Zambrano JG, Rojas-Zambrano AR, Rojas-Zambrano AF, Barahona-Cueva GE. Benefits of Testosterone Hormone in the Human Body: A Systematic Review. Cureus. 2025 Feb 9;17(2):e78785. doi: 10.7759/cureus.78785. PMID: 39926620; PMCID: PMC11807418.
Shigehara K, Izumi K, Kadono Y, Mizokami A. Testosterone and Bone Health in Men: A Narrative Review. J Clin Med. 2021 Feb 2;10(3):530. doi: 10.3390/jcm10030530. PMID: 33540526; PMCID: PMC7867125.
Mohamad NV, Soelaiman IN, Chin KY. A concise review of testosterone and bone health. Clin Interv Aging. 2016 Sep 22;11:1317-1324. doi: 10.2147/CIA.S115472. PMID: 27703340; PMCID: PMC5036835.
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