Everyday Wellness: Midlife Hormones, Menopause, and Science for Women 35+

Ep. 570 We’ve Been Wrong About Progesterone! – The Most Powerful Hormone for Heart, Brain & Longevity with Dr. Felice Gersh | Menopause & HRT

Mar 21, 2026

Dr. Felice Gersh, an integrative gynecologist and menopause expert, explains why progesterone is far more powerful than commonly believed. She covers how bioidentical progesterone differs from synthetic progestins, its roles in vascular and brain health via nitric oxide and neurotransmitter support, and how ovarian aging, mitochondria, and environmental factors affect women’s longevity.

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INSIGHT

Progesterone Is A Whole Body Life Hormone

Progesterone is a life hormone with receptors across brain, cardiovascular, musculoskeletal, skin, and mitochondrial systems, not just a uterine protectant.
Medroxyprogesterone acetate (MPA) falsely conflated progestins with progesterone and led to dismissal of progesterone's systemic benefits.

ADVICE

Avoid Medroxyprogesterone Acetate In HRT

Avoid using medroxyprogesterone acetate (MPA) as part of hormone replacement because it acts as an endocrine disruptor and caused harms in WHI/HERS trials.
Prefer bioidentical progesterone when replacing hormones for systemic benefits.

INSIGHT

Progesterone Supports Nitric Oxide And Vascular Health

Progesterone increases endothelial nitric oxide which preserves vascular dilation and prevents platelet aggregation.
Progestins like MPA block nitric oxide production and can increase clotting and vascular harm, opposite progesterone.

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I’m thrilled to have Dr. Felice Gersh join me for a two-part conversation focusing on menopause and HRT. She is a prolific voice in the integrative gynecology space, a true mentor, and someone I respect enormously.

In the first part today, we dive into progesterone and its wide-ranging systemic effects. We unpack the differences between synthetic and bioidentical hormones, discuss the Women's Health Initiative, examine the role of progesterone in cardiovascular disease, and look at the importance of nitric oxide production. We explore ovarian senescence and how we accelerate our ovarian aging. Dr. Gersh explains how declining nitric oxide production relates to aging and shares ways to achieve optimal health during menopause. We also discuss how PCOS impacts fertility and longevity, how estradiol and progesterone modulate neurotransmitters, and how they impact brain health and cognition in perimenopause and menopause.

This is truly a conversation you will not want to miss. Be sure to stay tuned for my second discussion with the insightful Dr. Felice Gersh.

IN THIS EPISODE, YOU WILL LEARN:

The value of progesterone beyond simply protecting the uterine lining
What progesterone does that synthetic progestins cannot do
How the risks and side effects of synthetic progestins unfairly tarnished the reputation of progesterone
How progesterone supports nitric oxide signaling and vascular health
The essential role progesterone plays in stabilizing the nervous system
The role of progesterone in supporting mitochondrial function, musculoskeletal health, and connective tissue repair
Symptoms that could appear or worsen when progesterone levels are low
Dr. Gersh reframes ovarian aging as a core marker of aging in women
Factors that could impair ovarian function and hormone production

Connect with Cynthia Thurlow

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Connect with Dr. Felice Gersh

On her website: Integrative Medical Group of Irvine
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All of Dr. Gersh’s books are available on Amazon.