GI DOCTOR-FORMULATED
Constipation has three root causes. RCE targets all of them.
TARGETED GUT SUPPORT
Start with what your gut needs
Built for different needs. Designed to work together.
We build supplements for your microbiome.
DR. WILL BULSIEWICZ, MD, GASTROENTEROLOGIST, 38TERA® CO-FOUNDER
"Most people feed themselves. Not their microbiome. I built 38TERA® to change that."
Clinically dosed
Every formula built with ingredients at the exact doses the research supports. What's on the label is what's in the formula.
Microbiome-first
We design supplements that feed your gut bacteria, because a healthy microbiome supports total-body wellness.
Science meets clinical practice
Independent research. Real-world patient outcomes. We formulate for what the evidence shows works.
Tested to the highest standard
Verified for purity, potency, and safety across 280+ substances through NSF® Certfied for Sport, independent testing and batch-level verification.
The 38TERA Family
Real results, real stories
Hear directly from the people who made 38TERA® part of their daily routine.
BESTSELLER
Trusted by 20K+ Guts
DMN®
Your Daily Foundation for Whole-Body Health.
- Feeds the bacteria that drive your whole-body health
- Reduces bloating and improves regularity
- Supports immune, metabolic and gut health
- Backed by an independent microbiome study
A higher standard. Proven at every step.
38TERA® is held to the highest quality and safety standards at every stage — from raw ingredient to finished product. Every batch. No exceptions.
NSF Certified for Sport®
The gold standard in supplement certification. Screens for 280+ banned substances, with ingredient testing, finished product testing, facility audits, and ongoing batch verification. Independently certified and continuously maintained.
Third-party tested. Every batch.
Independently tested for heavy metals, pesticides, and contaminants. What’s on the label is exactly what’s in the product.
Nothing unnecessary. Nothing undisclosed.
No artificial fillers. No artificial sweeteners. No glyphosate. No proprietary blends. Every ingredient listed. Every dose disclosed.
Manufactured to the highest standard
Produced in a GMP-certified facility. The same manufacturing standard required for pharmaceutical-grade products.
Sourced with intention
Raw materials are tested independently before they enter the supply chain. Quality starts before manufacturing.
The Weekly Digest
Expert insights, microbiome science, and practical advice — no fads, no fear.
FAQs
You've got questions? We have answers
Check out our FAQs to find answers to common questions and feel free to reach out if you have more.
What makes 38TERA® different from other gut health brands?
Most brands focus on quick fixes or rely on generic probiotics that only treat symptoms. 38TERA® was founded by a board-certified gastroenterologist to address the root cause of digestive issues. We use clinically dosed, targeted ingredients — like specific prebiotic fibres and resistant starches — to feed the beneficial bacteria you already have, creating lasting, foundational health. Our products are third-party tested, clinically guided, and designed to fit effortlessly into your daily life.
Are 38TERA® products safe to take every day?
Yes. Our products are designed to be a safe, effortless part of your daily routine. Every formula is rigorously third-party tested for purity and potency, and we never use artificial fillers, sweeteners, or harsh stimulant laxatives. If you have specific medical conditions, are pregnant, or are taking prescription medications, we always recommend consulting your physician before starting any new supplement.
How long will it take to see results?
Gut health is cumulative, not instant. While some people notice improvements in digestion and bloating within the first few days, the most meaningful benefits — like a stronger gut barrier, increased microbiome diversity, and reduced inflammation — develop over 4 to 8 weeks of consistent daily use. We set these expectations clearly because we’re in the business of lasting change, not short-term fixes.
Are there any negative side effects of DMN™?
DMN™ is a supplement activated by the gut microbiome, and therefore can cause gas and bloating symptoms in some cases as your body adjusts to taking it. It is Certified Low FODMAP, meaning that it was formulated to cause less gut symptoms than other prebiotic supplements. But it is still possible, particularly among those with a damaged gut microbiome, constipation, histamine intolerance, or other food intolerances. Please review the "DMN & your health" section in our Help Center for additional insights on these conditions. Also, it is rare, but it is possible for a person to have an allergic reaction to the ingredients in DMN™. We third party test for purity to insure that there are no contaminants, so that you can be confident that the only ingredients in a can of DMN™ are the ones seen on the package label.
How does the subscription work?
Our Subscribe & Save programme is built for your convenience. You have complete control — pause, skip a delivery, or cancel your subscription at any time directly from your account portal. No phone calls, no hoops.
What is your return policy?
We stand behind our science. If you’re not completely satisfied with your 38TERA® experience, we offer a 30-day money-back guarantee on your first order. Simply reach out to our support team and we’ll make it right — no questions asked.