EPISODE · Jul 31, 2026 · 12 MIN
The Truth About Female Testosterone
from Well Beyond 40
Did you know that testosterone is actually the most abundant sex hormone in women's bodies prior to menopause? I’m sitting down with Dr. Kelly Casperson, a board-certified urologist and women’s sexual health expert, to tackle one of the most misunderstood hormones in women: testosterone. We explore why testosterone matters for everything from your cellular energy and gym gains to motivation, mood, and libido, plus why a “normal” lab result might not tell the whole story. I also ask the practical questions you need answered about testing, finding the right level for your body, recognizing side effects, and approaching testosterone replacement safely. (02:07) Testosterone supports cellular and mitochondrial health, helping explain its connection to energy throughout the body. (02:51) Potential signs of low testosterone, including fatigue, declining gym performance, lower libido, and changes in mood. (03:34) Kelly describes testosterone as a motivation hormone that may influence much more than sexual desire. (04:37) Testosterone levels begin declining after your twenties, well before the dramatic hormonal changes associated with menopause. (05:41) There isn’t one simple “optimal” testosterone number; and timing, dosing, and natural hormone fluctuations complicate lab results. (07:47) Kelly’s three-part approach to evaluating testosterone treatment: how you feel, whether you experience unwanted side effects, and what your labs show. (10:18) Learn which blood test Kelly recommends for measuring female testosterone and why some standard testosterone tests may be poorly suited to women’s lower physiologic levels. Watch the full episode: https://youtu.be/p10VEJ5TEf8?si=OPd1ykJGyN7_0sHt Full show notes (including all links mentioned): https://jjvirgin.com/drkellyc
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The Truth About Female Testosterone
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