Podcast Summary: The Neuro Experience

Episode: "Why Testosterone is the Missing Link in Women’s Health"

Host: Louisa Nicola (B) & Pursuit Network
Guest: Dr. Kelly Casperson (A)
Date: October 21, 2025

Episode Overview

This episode delves into the overlooked and misunderstood role of testosterone in women's health, especially as it relates to menopause, longevity, sexual function, brain health, and systemic gender biases in medicine. Host Louisa Nicola and renowned urologist Dr. Kelly Casperson candidly address the science, myths, politics, and lived experiences around women and testosterone—including the lack of FDA-approved options, the interplay with other hormones, implications for cognitive health, and the movement to give women better access and information.

Key Discussion Points & Insights

1. Two Colliding Waves in Women's Health

• (00:00-00:18) Louisa and Dr. Casperson set the stage with a powerful metaphor: Younger generations demand preventative health and agency, while the medical establishment remains reactive—treating women only after symptoms emerge.
  • Quote: "We have these two waves that are going to crash... the medical system saying, we’ll treat you when you’re suffering." – Louisa (00:00)
  • Quote: "I hope it does. And we're here for it." – Dr. Casperson (00:16)

2. Testosterone: Not Just a 'Male Hormone'

• (02:48-05:06) Dr. Casperson, a urologist steeped in male hormone care, reveals how women are systemically overlooked in the conversation—despite the biology:
  • Ovaries produce testosterone; women have about four times as much testosterone as estrogen.
  • The pathway for estradiol production runs through testosterone.
  • Men's and women’s bodies both use estrogen and testosterone—just in different amounts.
• Quote: "To pigeonhole testosterone... is actually insane... Libido is a mood and motivation." – Dr. Casperson (00:47)
• Quote: "If a man has his testicles removed, it’s malpractice not to give him testosterone back. For women who have ovaries removed, only about 5% get hormone replacement." (04:36)

3. Gender Bias and Regulatory Barriers

• (05:35-07:29) The United States has approved testosterone products for men for decades; women, as of 2025, have zero FDA-approved options.
  • Regulatory inertia, profit motives, and the aftershocks of the misinterpreted Women's Health Initiative (WHI) study block female products.
  • Even when female testosterone was tested with robust safety data, it failed to gain approval.
• Quote: "Male testosterone got approved with six months’ safety data... Women’s [patch] had over four years’ safety data and did not get approved." – Dr. Casperson (05:46)

4. Hormone Complexity: Beyond Sex Ed

• (07:29-09:20) Hormones interact, travel together (never "alone"), act across numerous systems. Testosterone is produced mostly in the ovaries, partially in the adrenals, and affects tissues bodywide.
• Aromatization myth debunked: Not all supplemental testosterone becomes estradiol; in fact, direct benefits exist.
  • Quote: "We've done studies where women are on aromatase inhibitors—they can’t convert to estradiol—and their symptoms still get better on testosterone." (08:16)

5. Symptoms, Lab Values, and Diagnosis

• (09:20-16:55) There’s no single clinical test to distinguish low testosterone due to aging vs. lifestyle/stress. Both symptoms and labs matter, but the spectrum is nuanced:
  • Symptoms in women: Tiredness, low motivation, diminished libido, inability to gain muscle, etc.
  • Both men and women are often underserved due to overly rigid lab reference ranges.
  • Lab levels fluctuate based on stress and cycle; "normal" doesn’t mean "optimal."
  • DHEA supplements may help some women boost testosterone, but data is limited.

6. Testosterone & Emotional Health

• (20:10-22:08) Testosterone impacts mood—sometimes unmasking anger, increasing motivation, and even allowing women to safely taper off antidepressants.
  • Notable study from Louise Newsom’s clinic: estrogen + testosterone supported discontinuation of SSRIs (antidepressants) in women.
  • Quote: "Testosterone makes you more of who you are." – Dr. Casperson (20:30)
  • Quote: "The biggest gain in getting women off SSRIs was adding testosterone." (21:50)

7. Mythbusting: Testosterone in Women

• (23:09-26:21)
  • Myth: Testosterone is only for sex drive.
    • Reality: Impacts mood, motivation, muscle, metabolism, bone, cognition.
  • Myth: Testosterone masculinizes women.
    • Reality: Female dosing is 1/10 that for men; masculinization only occurs at very high, non-physiologic doses.
    • Quote: “Will this turn me into a man? Only if you ask me to.” – Dr. Casperson (28:16)

8. Regulatory Catch-22 and Social Stigma

• (24:36-27:59) In countries like Australia, testosterone is only indicated for low libido—forcing women to misrepresent their symptoms or be denied if not married.
  • Discriminatory access and insurance coverage issues are widespread globally.

9. Hormones, Menopause, and Cognitive Decline

• (39:50-51:57) Deep-dive into brain health:
  • Women are at double the risk of Alzheimer’s compared to men—once thought to be due to longevity, now known to be hormone-influenced.
  • Estrogen and testosterone both provide neuroprotection; loss at menopause impairs brain glucose metabolism, mitochondrial function, increases risk for dementia.
  • Studies show hormone therapy, particularly estrogen, lowers dementia risk; emerging data ties low testosterone to increased Alzheimer’s risk.
  • Quote: "The day you’re diagnosed with dementia, that process started 20 years earlier—basically at menopause." – Dr. Casperson (49:39)
  • Quote: "Testosterone is a neurohormone. Most menopause experts are trying to get away from even calling them 'sex hormones'." (12:37; 28:28)

10. Precision Medicine: Genetics and Hormone Therapy

• (58:40-62:21) Discussion on genetic risk (especially APOE4 genotype) for Alzheimer’s, and how it interacts with hormonal milieu.
  • Women with APOE4 + menopause are at 50% brain glucose deficit vs. 30% for non-carriers.

11. Clinical Use and Delivery of Testosterone

• (69:07-73:09) Various forms for women: compounded cream, gels, FDA-approved patches (outside US), injectables, sublingual troches, and pellets.
  • Compounded transdermal creams most prescribed in the US; safety and dosing need careful oversight.
  • Pellets are effective but have higher cost, invasiveness, and dosage peaks.
  • Quote: "Ideally you want a 40-year plan. Is the most expensive, highest-dose, most invasive option what you want for decades? Usually not." (72:19)

12. Societal Change, Advocacy, and the Path Forward

• (40:10, 76:07) Dr. Casperson urges women to demand better from medical systems, highlights her testimony at the FDA, and addresses the need for more products and more awareness.
• Quote: "The world won’t change because I showed up... It will change because thousands of women speak up for their healthcare." (41:03)

Notable Quotes & Timestamps

• On Gender Disparity:

  • "The world isn't built for females to thrive." – Louisa (46:08)
  • "What do we need a bunch of horny women walking around for?" – Quoted FDA official, via Dr. Casperson (46:11)

• On Cognition & Prevention:

  • "We need to switch medicine into being prevention... The tragic day you or a loved one is diagnosed with dementia, it started 20 years beforehand." – Dr. Casperson (49:39)
  • "If there was a medication that decreased risk of converting to diabetes by 30%, it would have a Super Bowl ad. That's estrogen." (64:03)

• On Stigma and Suffering:

  • "We need to support the woman. We need to support the team... So many people are like, maybe I wouldn’t have gotten divorced had I been on hormones." (35:17)

Timestamps for Important Segments

| Topic | Timestamp | |-------|-----------| | Modern Women’s Needs vs. Medical System | 00:00–01:10 | | Gender Bias in Hormone Approvals | 05:35–07:29 | | Hormone Physiology & Myths | 08:16–13:11 | | Symptoms & Diagnosis Nuances | 15:37–16:55 | | Testosterone & Mood | 20:10–22:08 | | Country Differences: Australia, US | 23:31–27:59 | | Osteoporosis & Women's Health Risks | 27:35–28:09 | | Testosterone Myths | 28:09–30:33 | | Cognitive Health & Brain Metabolism | 39:50–56:40 | | The APOE4 Gene & Women’s Risk | 58:40–62:21 | | Clinical Use & Delivery of Testosterone | 69:07–73:09 | | Societal Change Needed | 76:07–77:28 | | Historical Neglect: Augusta Deh | 77:43–79:21 |

Memorable Moments

• Dr. Casperson’s testimony at the FDA with Dr. Roberta Brinton and Dr. Vonda Wright advocating for women’s access to hormone therapy. (39:50–43:09)
• The revealing story of the first diagnosed case of Alzheimer’s (a woman, Augusta D., age 52, in 1901) and how her symptoms were dismissed. (77:43–79:21)
• Louisa’s candid sharing of her own testosterone testing experience, and the wild lab value variability. (16:46)

Summary Takeaways

• Testosterone is a vital hormone in women, impacting not just sex drive but brain, bone, muscle, mood, and long-term health.
• Lack of FDA-approved, insurance-covered options for women is the result of systemic gender bias, regulatory inertia, and profit motive.
• Hormone optimization is complex and individualized; labs are tools, not the final word. Patient-reported symptoms matter.
• Menopause is a neurological as well as hormonal event, with profound cognitive and physical consequences—many preventable by smarter hormone therapy.
• Advocacy and awareness are critical: Change comes from informed, organized patients demanding modern care.
• The gold standard for hormone therapy in women is transdermal (patch or cream) estradiol, often combined with low-dose testosterone.
• Early intervention (ideally before severe symptoms or cognitive decline) is vital—prevention is easier than repair.

Further Learning

• Dr. Kelly Casperson’s books:
  • "You Are Not Broken"
  • "The Menopause Moment"
• Follow-up research:
  • Roberta Brinton’s Humana study on HRT & dementia risk
  • Early results on testosterone and Alzheimer’s risk reduction
• Advocacy:
  • Emailing the FDA, engaging with women’s health networks, fighting for insurance equity

This episode is a must-listen for women in (or approaching) midlife, healthcare providers, and anyone interested in closing the gender gap in medicine and brain health.