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Why Probiotics Stop Working (And What Actually Rebuilds Your Gut)

Laurie Hammer
Laurie Hammer

Functional Nutritional Therapist

Shaina Cahill
Shaina Cahill

Director of Operations and Medical Affairs, Novel Biome

7 hours ago
  • Probiotics Are Fertilizer, Not Seeds
    Shaina Cahill explains that probiotics are “vacationers.” They support the bacteria already in your gut, then pass through and leave. If a keystone species like Bifidobacterium is completely gone, a probiotic is like fertilizer on an empty pot: nothing grows. She also warns that taking probiotics during a stool test can make it look like you have bacteria that disappear a week or two after you stop.
  • FMT Transfers a Healthy Gut’s “Instruction Manual”
    FMT captures a snapshot of a healthy donor’s microbiome and processes it into an enema, a capsule, or a tasteless, odorless oral powder. Only about 1% of donor applicants qualify. They’re screened for birth method, antibiotic history, family health history, and pathogens, then re-tested every 90 days. Treatment windows are getting longer so patients can build new diet, sleep and movement habits while the new bacteria settle in.
  • Your Gut and Brain Have Been Talking Since Birth
    The gut is one of the first systems to mature, taking on its adult-like setup by around ages 3 to 5, and it helps set the pace for immune and brain development. Shaina says most of the body’s serotonin is made in the gut, which helps explain brain fog, food-driven mood cycles, and why she’s seeing neurological disease rethought through the gut. Her advice is to start small. Adding one new food, taking the stairs, and sleeping when it’s dark all shift your gut within days. Real habits take about three months, not 21 days.

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