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

Scientists study DMN:

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.*

NSF Certified for Sport®. The industry's highest bar.

SIMON HILL, 38TERA® CO-FOUNDER

NSF Certified for Sport® is not a marketing badge. It is an independent certification program that tests supplements for 280+ banned substances. Every batch of DMN® is tested under this protocol — not once at launch, but every production run before anything ships.

280+ Banned Substances

280+ substances prohibited across professional and elite sport — tested per batch. WADA, NFL, MLB, NBA, and PGA compliant.

Contaminant Testing

Heavy metals, pesticides, and microbiological hazards — tested in raw materials and in the finished product before any batch is released.

Label Accuracy

Every active ingredient confirmed at the dose stated on the label — independently tested, not self-declared by the brand.

Manufacturing Audit

Facility standards independently audited: raw material sourcing, in-process controls, and finished product release protocols.

Real People, Real Reviews

Slide 1 selected
Total 5 star reviews: 902 Total 4 star reviews: 91 Total 3 star reviews: 53 Total 2 star reviews: 23 Total 1 star reviews: 22
Customers Talked About
Reviews Summary
Customers say this supplement mixes well with water and tastes pleasant. Many report improved regularity and reduced bloating within weeks of consistent use. Common feedback includes better digestion, decreased stomach discomfort, and increased energy levels. Some users note gradual progress requires patience and following dosage guidance. A few report no noticeable changes after several weeks. Overall, most praise its effectiveness for digestive support and ease of daily use.
1,091 reviews
  • Richard L.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve? Pick one that describes you best. Gut microbiome
    Rated 5 out of 5 stars
    3 minutes ago
    DMN is a game-changer

    I've been using DMN for the past couple of months and I've noticed some very positive and welcome changes.

  • Camille L.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve? Pick one that describes you best. Food intolerances
    Rated 5 out of 5 stars
    2 hours ago
    Tasty and Uplifting

    The first thing I take each morning is 38 Tera. It is tasty, easily dissoles in water, and gives me a lift. I would strongly suggest you have a backup supply on hand in case there are any unforeseen delays in receiving your next order. I would not like to miss a day of having this product available.

  • Tani B.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 hours ago
    Convenient

    Taking 38TERA every morning is part of my routine. It has made huge difference with my constipation. I don't want to be without it. so the travel pack is so convenient.

    thank you, Tani B

  • Will R.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    4 hours ago
    Works as advertised

    Dr. B has a solid product that works better than any other fiber supplement I have ever tried.

  • Eddie B.
    Flag of United States
    Verified Buyer
    I recommend this product
    What are you hoping to improve? Pick one that describes you best. Gut microbiome
    Rated 4 out of 5 stars
    8 hours ago
    Gut MicroBiome

    DMN seems to be working hard on my system. There has been a marked change for the better.