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  • My inside/outside skincare protocol
    Women’s Health & Hormones

    My inside/outside skincare protocol

    Personal Story, Skin & Beauty, Supplements, Women’s Health
    Robin Berzin MD
    August 5, 2025

    We tend to think of aging skin as surface-level. It’s not. Here’s the inside-meets-outside skincare protocol that changed my face. Read more

  • Chronological vs. Biological Age: Which One Really Matters?
    Longevity & Metabolic Health

    Chronological vs. Biological Age: Which One Really Matters?

    Exercise, Lab Testing, Longevity, Supplements
    Robin Berzin MD
    September 23, 2025

    Biological age predicts disease risk, functional health, and even mortality better than your chronological age. Here’s how to lower yours. Read more

  • If You Only Fix One Thing for Longevity, Make It Your Mitochondria.
    Longevity & Metabolic Health

    If You Only Fix One Thing for Longevity, Make It Your Mitochondria.

    Blood Sugar & Metabolism, Exercise, Longevity, Supplements
    Robin Berzin MD
    January 6, 2026

    Mitochondria are the powerhouses of the cells. They’re also the biological foundation of aging. When they’re thriving, you’re thriving. Read more

  • Why GLP-1s Underperform Without Estrogen
    Women’s Health & Hormones

    Why GLP-1s Underperform Without Estrogen

    Blood Sugar & Metabolism, Hormones, Supplements, Women’s Health
    Robin Berzin MD
    February 26, 2026

    I had a patient gain 50 lbs in 6 months. GLP-1 alone did nothing. Adding HRT changed everything. Here’s the science behind why estrogen makes GLP-1s work. Read more

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Robin Berzin MD

Robin Berzin MD is the founder of Parsley Health and your guide on the journey to being well.

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