Dr. Will Bulsiewicz
Why Dr B recommends thisBoard-Certified Gastroenterologist · NYT Bestselling Author of Fiber Fueled

"Most people are feeding themselves — but not their microbiome. DMN™ was built to close that gap. I designed this formula because nothing like it existed."

Dr. Will Bulsiewicz, MD, MSCI — Board Certified Gastroenterologist

15 Day Microbiome Study

Your microbiome starts changing within 24 hours

An independent M-SHIME® gut-model study tracked the measurable changes that happen when you take DMN™ consistently. The data speaks for itself.

View the 15-Day Microbiome Study Results ➔

Day 1Acetate ↑ from 24hrs
First fermentation begins

Resistant starch reaches your colon and bacteria begin breaking it down. SCFA production starts almost immediately.

Day 3Acetate ↑12%
Steadier energy, fewer cravings

Short-chain fatty acids begin signalling your brain and metabolism. Acetate increases 12% — your gut is making clean fuel.

Day 5Ammonium ↓11%
Less bloating, clearer head

Ammonia (a gut irritant) drops 11% as beneficial bacteria begin crowding out fermenters that cause gas and discomfort.

Day 8Propionate ↑28%
Microbiome shift underway

Beneficial bacteria populations are measurably rising. Propionate climbs 28% — gut cells are getting well-fed, digestion smooths out.

Day 15TNFα ↓ · Akkermansia ↑
Akkermansia takes charge

Your gut's guardian bacterium rises to prominence. TNFα drops — inflammation cools. This is the gut reset you've been building toward.

1 month+Long-term foundation
Deep repair and steady balance

Your microbiome enters a phase of sustained diversity. Long-term benefits — immunity, metabolism, mood — compound with consistent daily use.

†In an Independent M-SHIME® 15-day human gut-model study, DMN™ supported microbial balance by increasing key short-chain fatty acids and reducing gut irritation markers. Not a human clinical trial.*

Tested. Certified. Trusted.

Co-Founder Simon Hill explains the importance of why every batch is third-party tested and what's on the label is what's in the product—nothing more.

NSF Certified for Sport®

Made in a GMP and FDA-accredited facility

Exceeds strict regulatory requirements

Contains minimal allergenic substances

Real People, Real Reviews

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Total 5 star reviews: 787 Total 4 star reviews: 72 Total 3 star reviews: 42 Total 2 star reviews: 16 Total 1 star reviews: 15
Customers Talked About
932 reviews
  • Gwen E.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve with DMN? Pick one that describes you best. Gut microbiome
    Rated 5 out of 5 stars
    2 weeks ago
    We love our pink drink!!!

    My husband and I love our pink drink every night at 8pm. We feel amazing in our last year of our 40's. Thank you, Dr B!!

  • Sacha L.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve with DMN? Pick one that describes you best. Gut microbiome
    Rated 5 out of 5 stars
    4 weeks ago
    The Best for Your Gut

    I absolutely will not go without my daily 38Tera. It has become a part of my daily routine. It has helped tremendously correct my constipation issue. A must have for everyone!

  • Roz A.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve with DMN? Pick one that describes you best. Constipation
    Rated 5 out of 5 stars
    1 month ago
    5 Star Poops

    Dr. B,

    Your work with Fiber Fueled and The Fiber Fueled Cookbook truly began my journey toward healing my gut. For most of my life, I struggled with chronic constipation—so severe that an ultrasound once showed I was, quite literally, full of s_ it. At 69 years old, I can finally say that I experience consistent, normal bowel movements thanks to 38Tera. I never thought this would be possible.

    Over the years, I tried countless products without success, but nothing worked like this. As a licensed professional counselor and hormone consultant for 34 years, I often tell my clients: “Listen to your gut.” But if your gut isn’t functioning, how can you hear what it’s telling you?

    Constipation is the most consistent symptom I see on my hormone checklist, and your work has given me—and those I serve—a real solution. I recommend your books and 38Tera to all of my clients.

    You’ve empowered people to take charge of their health and truly improve their lives.

    Thank you.

    3 Profile picture for 38TERA
    38TERA
    1 month ago

    Thank you so much for sharing your story with us. What a journey, and what an incredible milestone to reach after so many years of searching for answers. We're so glad DMN has become a meaningful part of your daily routine. Thank you for trusting us with your health journey, and for helping others find theirs. ❤️

  • Natalie K.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve with DMN? Pick one that describes you best. Bloating
    Rated 5 out of 5 stars
    1 month ago
    Shipping Problem

    Love the product and felt like I was improving until I ran out 1-1/2 weeks before my auto ship arrived. Don’t know how to contact to get my other shipment out now so that I don’t run out again. Been having issues since I ran out and started again with 12 bowel movements a day or more than nothing for 1-1/2 days or last night up 5 times between 12 am and 4:30 am with diarrhea.

  • Andrea
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve with DMN? Pick one that describes you best. Gut microbiome
    Rated 5 out of 5 stars
    1 month ago
    Feeling the best yet

    I have my life back!!!