gut microbiome newsletters

NewsletterFIT tracks 8 newsletters that cover gut microbiome as a primary topic, all with posts in the last 90 days. By publicly shown subscriber count, the largest are Independent Medical Alliance (51K), Stayin' Alive (24K) and Funxional Health with Dr. Brandon Pettke (13K). Brands detected sponsoring these newsletters recently include Methuselah Foundation and Bon Charge.

Updated Oct 30, 2026 · sorted by publicly shown subscribers · methodology

  1. 1
    Independent Medical Alliance 51K subscribers

    Substack Every two weeks · last post 14 days ago

    Likely audience: Health-conscious consumers

  2. 2
    Stayin' Alive 24K subscribers

    beehiiv Weekly · last post 25 days ago

    Likely audience: Biohackers

    Sponsors detected: Bon Charge

  3. 3
    Funxional Health with Dr. Brandon Pettke 13K subscribers

    Substack Every two weeks · last post 11 days ago

    Likely audience: functional medicine practitioners

  4. 4
    Hormonal 9K subscribers

    Substack Every two weeks · last post 15 days ago

    Likely audience: women experiencing perimenopause or menopause

  5. 5
    WellnessWiz’s Substack 7K subscribers

    Substack Every two weeks · last post 10 days ago

    Likely audience: Natural health practitioners

  6. 6
    Calm & Grounded with Stacey Chillemi 7K subscribers

    Substack Every two weeks · last post 7 days ago

    Likely audience: Health-conscious individuals

  7. 7
    The Happy Gut Effect 7K subscribers

    Substack Every two weeks · last post 8 days ago

    Likely audience: patients on GLP-1 medications

  8. 8
    Lifespan Research Institute —

    mailchimp Weekly · last post 20 days ago

    Likely audience: Health researchers

    Sponsors detected: Methuselah Foundation

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