Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

To optimize your health you need to understand your genetic traits since this provides important information about your body's performance.

Bioavailable testosterone serves as an essential genetic trait that affects reproductive and sexual health. In this blog post we investigate bioavailable testosterone's crucial role in health and deliver practical tips to improve your overall well-being. Testosterone functions throughout the body as the primary hormone produced by male testes and female ovaries. It exists in the blood in three primary forms: In the bloodstream testosterone travels in three distinct forms including protein-bound testosterone attached to SHBG and weakly bound testosterone attached to albumin alongside free testosterone which functions independently of any proteins. Half of total testosterone exists as bioavailable testosterone which includes the portion that attaches weakly to albumin along with freely circulating testosterone. The bioavailable testosterone fraction is crucial because it moves through tissues to deliver multiple beneficial health effects which promote overall well-being. Free testosterone distinguishes itself from other testosterone types because it influences multiple health-related functions. This hormone enhances bone health and muscle maintenance while increasing red blood cell and sperm production and improves sexual function and mood with additional benefits for brain performance. Health problems like depression and rheumatoid arthritis alongside blood clotting disorders may be caused by genetically increased testosterone levels. Bioavailable testosterone levels display considerable genetic influence because genetic variations account for approximately 45% of the observed differences. Both males and females experience a gradual decline in free testosterone levels after reaching their peak during their late twenties. Obesity and specific medications along with substance abuse problems like alcohol as well as chronic medical conditions such as type 2 diabetes and obstructive sleep apnea can lead to low testosterone levels. Medical professionals often measure total testosterone, yet bioavailable and free testosterone tests offer more comprehensive understanding of hormonal status. Performing these tests needs more resources and specialized knowledge yet they prove essential for patients who have low testosterone symptoms alongside normal total testosterone readings. The subsequent practical suggestions will help improve your reproductive and sexual well-being.

  1. Maintain a Healthy Weight: Reducing obesity-associated testosterone levels can be achieved by maintaining your weight through balanced nutrition and regular exercise which also helps sustain hormonal equilibrium.
  2. Limit Alcohol Consumption: Excessive alcohol consumption disrupts normal hormone production which includes testosterone. Maintaining optimal testosterone levels requires practicing moderation in your lifestyle choices.
  3. Manage Chronic Conditions: Medical supervision in treating type 2 diabetes or obstructive sleep apnea helps patients achieve stable testosterone levels.
  4. Regular Exercise: Strength training exercises through physical activity function as a natural method to boost testosterone levels.
  5. Prioritize Sleep: Healthy testosterone levels are maintained through nightly adequate sleep which helps control hormone regulation in the body.

Understanding bioavailable testosterone's effects on your health allows you to make informed decisions regarding reproductive and sexual health optimization. PlexusDx provides Precision Health & Wellness tests available at PlexusDx.com, Amazon, and Walmart which deliver genetic insights that allow you to take proactive steps toward improving your health. Dive into your health empowerment journey by learning about genetic insights to unlock your ultimate health potential.

Frequently Asked Questions

What makes up bioavailable testosterone and how does it differ from total testosterone?

Bioavailable testosterone is the portion weakly bound to albumin plus the freely circulating testosterone, and the post says it accounts for about half of total testosterone. The rest is protein-bound to SHBG. The bioavailable fraction matters because it can move through tissues to deliver its effects, which is a distinction a total testosterone number alone does not show.

Which body functions does the post attribute to free testosterone?

The post credits free testosterone with enhancing bone health and muscle maintenance, increasing red blood cell and sperm production, and improving sexual function and mood, with additional benefits for brain performance. It describes testosterone as the primary hormone produced by the male testes and the female ovaries. These are general physiological roles described in the article, not guaranteed effects for any individual.

How much of the variation in bioavailable testosterone does the post call genetic?

The post states that genetic variations account for approximately 45 percent of the observed differences in bioavailable testosterone levels between people. It also notes that both males and females experience a gradual decline in free testosterone after levels peak in the late twenties. A population variation figure says nothing about where any one person's level sits; only a blood test ordered by a clinician can show that.

When does the post say a free or bioavailable testosterone test adds information?

The post says medical professionals often measure total testosterone, but that bioavailable and free testosterone tests offer a more comprehensive understanding of hormonal status. It notes these tests require more resources and specialized knowledge, and calls them important for patients who have low testosterone symptoms alongside a normal total testosterone reading. Whether such testing fits your situation is a decision for your healthcare provider.

Which lifestyle factors does the post connect to low testosterone?

The post links low testosterone to obesity, certain medications, substance misuse including alcohol, and chronic conditions such as type 2 diabetes and obstructive sleep apnea. Its suggestions follow directly: maintain a healthy weight, moderate alcohol, manage chronic conditions under medical supervision, do strength training and prioritize sleep. These are general wellness habits, not treatment for a diagnosed hormone disorder.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.