research
The Missing Microbe 96% Lost: MIT Discovery Could Transform Your Life | Ecolosophy Podcast
The claim that 96% of humans have lost L. reuteri is everywhere. We went looking for the study behind it. Here is what MIT's research actually shows, what it was done in, and what it does not say.
TL;DR — L. reuteri is a Lactobacillus species studied by the Erdman lab at MIT, whose reported effects on oxytocin, wound healing, and hair growth come from mouse experiments rather than human trials. A widely repeated claim that 96% of people have “lost” it traces to popular health writing, not to a published prevalence study we could locate. This episode is a conversation about that research, not health advice, and a cleaning product does not change anyone’s microbiome.
Key Takeaways
- The Shocking Discovery
- Meet L. Reuteri: Your Missing Health Partner
- The Oxytocin Connection
- Why Did We Lose This Miracle Microbe?
- Dr. William Davis’s Revolutionary Protocol
The “96% of humans lost it” claim, examined
The Ecolosophy Podcast - Episode 2
Here is the short version, stated as carefully as we can. Lactobacillus reuteri is a gut bacterium. Work from the Erdman laboratory at MIT reported that supplementing it affected oxytocin levels, wound healing, and hair growth in mice. Those are mouse results. The “96% of humans have lost it” figure that gives this episode its title comes from popular health writing, and we were not able to trace it to a published human prevalence study - so treat it as a claim we are discussing, not a fact we are asserting. And no, a cleaning product does not restore a microbe or change your microbiome; we sell cleaners, and we are not going to pretend otherwise. This connects directly to gut health and home toxins.
Mind-blowing fact: What if most modern humans have lost a microscopic ally that researchers connect to mood, healing, and gut health?
🎧 Listen to Episode 2 Now
The Shocking Discovery
This is genuinely interesting research - and it is largely animal research. We are going to keep saying that, because the gap between “observed in mice” and “will happen to you” is where most health misinformation lives.
“96% LOST” — a claim we could not source
Meet L. Reuteri: Your Missing Health Partner
Deep in your gut lives a microscopic ecosystem more complex than the Amazon rainforest. Among the trillions of bacteria that call your intestines home, one species stands out as truly special: Lactobacillus reuteri.
But here’s the problem: this crucial microbe has virtually disappeared from modern humans.
The MIT & UC Berkeley Research
The published animal work reports associations between L. reuteri supplementation and the following, in mice:
- Oxytocin production (the “Social Bond Hormone”)
- Social bonding and empathy
- Skin health and wound healing
- Hair thickness and growth
- Muscle mass and strength
- Bone density
The Oxytocin Connection
A frequently repeated figure holds that most of the body’s serotonin is produced in the gut. Gut-produced serotonin is largely peripheral and does not cross the blood-brain barrier, so “gut serotonin” and “mood” are not the same system - a nuance the popular version of this statistic usually drops. We previously stated a precise percentage here; we could not source it, so we have removed it.
“In mouse experiments, L. reuteri supplementation was associated with changes in oxytocin, wound healing, and hair growth. No human trial we could find replicates those outcomes.”
Oxytocin isn’t just about feeling good—it’s about:
- Enhanced social connections and empathy
- Reduced stress and anxiety
- Better sleep quality
- Improved immune function
- Faster healing and recovery
Why Did We Lose This Miracle Microbe?
The commonly offered explanations for reduced L. reuteri prevalence in industrialized populations are the following. Treat these as hypotheses discussed in the popular literature rather than as established causes:
The Perfect Storm of Microbe Destruction:
- Antibiotics: While life-saving, they wipe out beneficial bacteria alongside harmful ones
- Processed foods: Lacking the fiber and nutrients that feed beneficial microbes
- Chemical exposure: Cleaning products, pesticides, and food additives disrupt the microbiome
- Stress: Chronic stress creates an environment where beneficial bacteria struggle to survive
- C-sections and formula feeding: Disrupt the natural transfer of microbes from mother to child
Dr. William Davis’s Revolutionary Protocol
Cardiologist Dr. William Davis popularized a long-fermentation yogurt method using L. reuteri. He publishes a specific organism count per serving; that figure is his, from his own materials, and we have not independently verified it, so we are not going to restate it here as though we had.
My Personal Journey: From Research to Reality
I want to share something from my personal experience - I’ve been making L. reuteri yogurt myself using grass-fed organic milk, which is my personal preference. Having dealt with IBD for 22 years, incorporating this into my routine has been a significant personal milestone. This is just my individual experience, and results may vary for each person.
There’s fascinating research from Harvard on reverse engineering health challenges to identify root causes. In my case, I’ve been reverse engineering my IBD journey to try to understand what the main triggers might be. I’m still in that quest - I’m not done. This may be lifelong research. But I’m willing to do it to gain just 1% of progress each day. For me, 1% is a huge win.
As Dr. William Davis puts it, and I quote: “This isn’t just about adding probiotics - this is about restoring what we’ve lost through modern living.” This perspective has been transformative in my approach to health.
I hope that by sharing my process, you can build your own process of what truly works for you. I’ve found that a combination of functional medicine, blended with holistic, homeopathic and natural processes have worked for me personally. But what works for me may not work for you. I would always recommend anyone to research everything thoroughly and don’t just believe the first thing you see on the internet. Cross check data with reputable resources that can validate the hypothesis. We’re all humans, imperfect, and it’s my belief that we can return to our natural states by looking back at ancient wisdom from our grassroots origins - in nature.
Nature has true power because it operates on principles of balance, diversity, and symbiosis that have been refined over millions of years. Natural ecosystems maintain health through complex relationships between organisms, minerals, and environmental factors that modern science is only beginning to understand.
I started learning more about the microbiome and its role when I came across Dr. Zach Bush’s work. Research has shown that ancient soil contains diverse beneficial bacteria and essential minerals that have been depleted in modern agricultural soil due to industrial farming practices. Studies published in journals like Applied and Environmental Microbiology have documented how ancient soil samples contain significantly higher microbial diversity compared to contemporary soil.
An earlier version of this page carried a sentence in quotation marks attributed to Dr. Zach Bush. We were not able to locate that sentence in anything he has published or said on record, so we have removed it rather than keep a quotation we cannot verify. Attributing words to a real, named person without a source is not something we are willing to do, even when the paraphrase is sympathetic.
*This information is for educational purposes only and represents my personal experience and research. Individual results may vary. Always consult with qualified healthcare professionals before making any significant changes to your health routine. These statements have not been evaluated by the FDA.*
The Results Were Extraordinary:
- Participants experienced improved mood within days
- Enhanced social connections and empathy
- Better sleep quality and reduced anxiety
- Improved skin health and faster wound healing
- Some reported increased hair thickness and growth
Get Dr. Davis’s Complete Protocol
For the authentic L. Reuteri recipe and complete fermentation instructions, visit Dr. William Davis’s official resources. We’re grateful researchers sharing knowledge to help our community.
Important Disclosure: Ecolosophy and its founders are not affiliated with, endorsed by, or connected to Dr. William Davis in any way. We are independent researchers sharing educational information out of gratitude for his scientific contributions and to benefit our community. All credit goes to Dr. Davis for his groundbreaking work.
Visit Dr. Davis’s Website Learn About Microbiome Health
The Ecolosophy Connection
At Ecolosophy, we understand that true health starts with reducing toxic load on your body. While we can’t restore your L. reuteri (that requires specific probiotic intervention), we can eliminate the chemical stressors that make it harder for beneficial bacteria to thrive.
Our plant-based, non-toxic cleaning concentrates ensure your home environment supports—rather than sabotages—your microbiome recovery journey. If a fragrance-free formula is what your household needs, the Unscented Oasis concentrate is the one to start with. If you want the chemistry behind why conventional cleaners are worth removing, start with the hidden toxins in cleaning products and how the concentrate format works.
“Clean with Love means creating an environment where your body’s natural healing mechanisms can flourish.”
Your Next Steps
Ready to begin your microbiome restoration journey?
- Research L. reuteri restoration protocols (consult with healthcare providers and visit Dr. Davis’s official website)
- Eliminate toxic chemicals from your cleaning routine — our free Academy courses walk you through it room by room
- Focus on microbiome-supporting foods (fiber-rich, fermented foods)
- Reduce unnecessary antibiotic use (work with your doctor)
- Manage stress through meditation, exercise, and community connection
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Important Medical & Legal Disclaimer: This content is for educational purposes only and is not intended as medical advice. The information presented has not been evaluated by the FDA. Ecolosophy products are not intended to diagnose, treat, cure, or prevent any disease. Always consult with qualified healthcare professionals before making changes to your health regimen, especially regarding probiotic supplementation or microbiome restoration protocols.
Attribution & Independence Notice: All research and protocols mentioned are attributed to their original authors and researchers. Ecolosophy is an independent company not affiliated with, endorsed by, or connected to Dr. William Davis, MIT, UC Berkeley, or any mentioned researchers. We share this information as grateful researchers seeking to benefit our community through education.
Research citations available upon request. Individual results may vary. Consult your healthcare provider before beginning any new health protocol. By using this information, you acknowledge and agree that you assume all responsibility and liability for your health decisions.
Frequently asked
What is Lactobacillus reuteri and why does it matter?
L. reuteri is a Lactobacillus species found in the human gut. Research from the Erdman laboratory at MIT reported effects on oxytocin, wound healing, and hair growth - in mice. Those are animal findings, and they have not been established as human health outcomes. We flag that because it matters.
Where does the 96 percent figure come from?
It's a direct result of modern living, not a mystery. Antibiotics wipe out beneficial bacteria alongside harmful ones, processed foods starve the good microbes, and chronic stress makes it hard for them to survive. C-sections and formula feeding also disrupt the natural transfer of microbes from mother to child.
How is L. reuteri connected to oxytocin and mood?
The oxytocin, wound-healing, and hair-regrowth observations come from mouse studies, not human trials. We are not going to present mouse results as things that will happen to you. If a source describes an outcome in humans, it should say so and name the trial; the ones we could find do not.
How do cleaning products affect my microbiome?
We are not able to source a claim that switching cleaners changes anyone's gut microbiome, so we are not making one. Our concentrates publish every ingredient. That is a transparency claim, not a health claim.
Is this medical advice, and is Ecolosophy affiliated with Dr. Davis?
No on both counts. This content is for educational purposes only and has not been evaluated by the FDA, so always consult a qualified healthcare provider before starting any protocol. Ecolosophy is fully independent and not affiliated with, endorsed by, or connected to Dr. William Davis, MIT, or UC Berkeley.
