# Robin Berzin, MD

> Robin Berzin, MD is a Columbia-trained physician, founder and CEO of Parsley Health, and a leading voice in women's functional medicine, longevity, and root-cause health. This site publishes evidence-based, physician-written guidance for women (primarily 35–65) on hormones, metabolism, longevity, fertility, nutrition, toxins, and brain health.

## About
- [About Robin Berzin, MD](https://www.robinberzinmd.com/about/): Physician background, credentials, and recognition.
- [Parsley Health](https://www.parsleyhealth.com/): Robin's root-cause medical practice — online, nationwide.
- [State Change (book)](https://www.robinberzinmd.com/book/): Robin's book on healing the mind by starting with the body.

## Topic hubs
- [Women's Health & Hormones](https://www.robinberzinmd.com/category/womens-health-hormones/): Perimenopause, estrogen, thyroid, bone density, and the labs women should track.
- [Longevity & Metabolic Health](https://www.robinberzinmd.com/category/longevity-metabolic-health/): Healthspan, muscle, VO₂ max, biological age, CGMs.
- [Brain, Mood & Nervous System](https://www.robinberzinmd.com/category/brain-mood-nervous-system/): Metabolic mental health, the vagus nerve, slowing brain aging.
- [Toxins, Nutrition & Modern Exposures](https://www.robinberzinmd.com/category/toxins-nutrition-modern-exposures/): Microplastics, mold, seed oils, protein, supplements.
- [Fertility & Parenting](https://www.robinberzinmd.com/category/fertility-parenting-robin-berzin-md/): Egg quality, preconception, MTHFR, maternal health.

## Cornerstone articles
- [100 Essential Labs Every Woman Should Be Tracking](https://www.robinberzinmd.com/essential-longevity-labs-for-women/)
- [Perimenopause Symptoms: What the Research Shows](https://www.robinberzinmd.com/perimenopause-symptoms-research/)
- [Is estrogen the ultimate longevity drug?](https://www.robinberzinmd.com/is-estrogen-the-ultimate-longevity-drug/)
- [Muscle Mass Is the Real Longevity Metric](https://www.robinberzinmd.com/muscle-mass-is-the-ultimate-longevity-metric/)
- [VO₂ max: the one number to track for healthspan](https://www.robinberzinmd.com/if-you-only-track-one-fitness-metric-make-it-vo2-max/)

## Newsletter
- [Subscribe](https://www.robinberzinmd.com/newsletter/): Weekly evidence-based protocols for women's longevity and functional medicine (50,000+ readers).

## Notes
- Author and reviewer: Robin Berzin, MD (Columbia University; Internal Medicine residency, Mount Sinai).
- Content is educational and not a substitute for professional medical advice, diagnosis, or treatment.