Podcast

Progesterone: The Breakthrough Women Deserve

Podcast · 33 min · Dec 3, 2025 · Dr. Brendan McCarthy

About this episode

In today’s episode, I’m opening the first chapter of what I believe is the most important series I’ve ever created — a deep dive into progesterone and why it became the heart of my medical practice. For more than 20 years, I’ve watched this “simple, humble hormone” transform women’s lives in ways most conventional medicine overlooks. What started in two small treatment rooms has grown into a 25,000 sq ft facility, and the core of our success comes down to understanding progesterone’s impact on the female brain, stress response, and emotional resilience. In this episode, I break down: Why progesterone is far more than a reproductive hormone How it regulates the female stress response (amygdala, hippocampus, prefrontal cortex) Why anxiety, insomnia, irritability, and emotional overwhelm often map directly to progesterone decline Why so many women feel “unraveled” in their 40s — and why it’s not their fault The science behind oral vs. sublingual progesterone (and why I use troches) How conventional medicine often misses the root cause The importance of physicians showing their work, their data, and their citations The lived stories and clinical outcomes that changed how I practice medicine If you’ve ever felt dismissed, unseen, or told that your anxiety or mood changes are “just stress,” this episode is for you. This is the beginning of a 7-part series where I break down the neurobiology, endocrinology, testing, dosing, delivery methods, breast health, perimenopause, and more. Citations: Brinton, Roberta Diaz, et al. “Neurosteroids and Brain Function.” Steroids, vol. 81, 2014, pp. 61–78. Epperson, C. Neill, et al. “New Insights into Perimenopausal Depression: A Neuroendocrine Vulnerability Framework.” The Lancet Psychiatry, vol. 9, no. 2, 2022, pp. 110–118. Frye, Cheryl A. “Neurosteroids—Endogenous Modulators of GABA_A Receptors.” Pharmacology & Therapeutics, vol. 116, no. 1, 2007, pp. 58–76. Genazzani, Andrea R., et al. “Progesterone, Stress, and the Brain.” Human Rep

This content is for education and is not medical advice. It does not replace an evaluation with a licensed provider, and no one should start, stop or change a medication on its basis.

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