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— Sourced from the Pristine Siberian Tundra —
Deep beneath the untouched organic soils of Siberia lives one of nature's most powerful organisms. Tundrex harnesses Bacillus subtilis — a probiotic strain of extraordinary potency — to transform your gut, immunity, and vitality from within.
The medical technology behind the Tundrex product family was developed in the late 1980s and early 1990s — long before the international medical community began to realize the vital role the human microbiome plays in health and wellness.
The developer spent more than 10 years researching and testing this technology to create a product line that remains in high demand decades later. The result: a unique, well-tested, highly effective, and safe product line successfully marketed worldwide for more than 30 years.
Tundrex has been available in the US since 2020, and tens of thousands of Americans have already discovered the benefits “a probiotic that works” can deliver.
Early on, the Tundrex team identified the Bacillus bacteria group as important members of the human microbiome “family” — but often missing in the human gut.
Bacillus bacteria are soil-based organisms that only survive in the human gut for about a month. One must replenish them regularly. In the world we live in today, there are no easy, natural ways to do so — everything is purified, triple-washed, and sanitized.
This is exactly what Tundrex does — it delivers this important missing piece of the human microbiome.
Tundrex is 100% natural — it contains only natural excipients and Bacillus bacteria in the endosporal form. No chemicals of any kind, which means no overdose or side effects. The endosporal form is the key to Tundrex’s efficacy — it helps the bacteria safely travel through stomach acid and arrive in the intestine to activate and deliver the benefits we expect from a probiotic.
Bacillus subtilis is the finest probiotic organism I have yet worked with. Its capacity to modulate immune function and restore gut integrity is unlike anything else in my clinical practice.
Not all probiotics are equal. Tundrex goes deeper — sourcing strains that evolved to survive extreme conditions, making them exponentially more resilient and effective in your body.
Our Bacillus subtilis strains are extracted from pristine organic tundra soil in Siberia — one of the most untouched, mineral-rich environments on Earth.
Each capsule delivers a higher concentration of viable, spore-forming bacteria than conventional probiotics — surviving stomach acid to colonize where it matters.
Trusted by Dr. Leo Galland, MD — a leading integrative medicine physician in New York — who considers Bacillus subtilis the finest probiotic organism he's worked with.
No fillers, no artificial additives. Every batch is sourced from certified organic tundra soil, free from pesticides, heavy metals, and contaminants.
Thousands of customers have experienced the Tundrex difference. Here’s what they’re saying.
"I've tried probably six different probiotic brands over the years. None of them made a noticeable difference. Within two weeks of starting Tundrex 1.1, my bloating was noticeably reduced and I had more consistent energy throughout the day."
"Did the Immunity Boost protocol after my doctor suggested adding a probiotic. I usually get at least two or three colds every winter — this past season I had zero. I'm a convert."
"After a 10-day course of antibiotics last spring, my gut was a wreck. My doctor recommended a probiotic and I found Tundrex. The Microbiome Recovery protocol brought me back to normal faster than I expected."
"Three months in, doing a course every quarter as suggested. Digestion is much calmer — no more afternoon crashes, better focus at work. It's become a non-negotiable part of my routine."
"My gut has been sensitive my whole life. Tundrex 1.1 is the first probiotic that's actually made a tangible difference. The spore-forming thing is real — most probiotics die in your stomach before they do anything."
"A friend who's a functional medicine practitioner pointed me toward Tundrex. Started with the Immunity Boost and haven't looked back. Clean ingredients, no fillers, and it actually works."
"I was skeptical — I'd tried other Bacillus subtilis supplements before with mixed results. Whatever they're doing with the Siberian sourcing, it's different. My gut feels more stable than it has in years."
"Completed the Microbiome Recovery protocol after a bad stomach bug wiped out my gut flora. The two-phase approach with 1.1 then Tundrex 3 made a lot of sense. Felt back to myself by the end of it."
"I've been dealing with IBS symptoms for years. Tundrex hasn't cured anything, but the frequency and severity of flare-ups has dropped significantly since I started doing quarterly courses. That's all I can ask for."
Not all probiotic strains are created equal. Bacillus subtilis stands apart — a spore-forming organism with remarkable resilience, studied extensively for its role in gut and immune health.
Bacillus subtilis has been described as an "Alexander organism" — a leader that can help organize and restore balance within the complex gut microbiome community, particularly following disruption.
Research suggests Bacillus subtilis may help modulate immune function by interacting with gut-associated lymphoid tissue (GALT) — the immune network that lines the digestive tract and accounts for a significant portion of the body's immune activity.
Studies indicate Bacillus subtilis may help support digestive function through the production of short-chain fatty acids (SCFAs), which play a role in maintaining the intestinal lining and supporting healthy gut motility and comfort.
Unlike fragile Lactobacillus strains, Bacillus subtilis forms spores that survive harsh stomach acid and the full passage through the digestive system — arriving viable and active where they're needed most.
Peer-reviewed research & expert presentations — including Dr. Leo Galland, MD. Provided for educational purposes only.
Disclaimer: These references are for educational purposes only and do not constitute medical advice. These statements have not been evaluated by the FDA. Tundrex products are not intended to diagnose, treat, cure, or prevent any disease.
From daily immune maintenance to deep full-system restoration — every Tundrex protocol is built around the same pristine Siberian Bacillus subtilis strain.
Daily immune support & microbiome maintenance. The recommended starting point — repeat every 3–4 months.
Intensive gut restoration after antibiotics, illness, or disruption. Small & large intestine coverage.
Deeper restoration with an extended 15-day small intestine phase followed by large intestine support.
Full-spectrum microbiome restoration using all 3 Tundrex products. Complete digestive tract coverage.
The most intensive protocol — 25-day small intestine phase for complete GI restoration.
Your body speaks through symptoms. If you're experiencing any of these, your microbiome may be calling for help.
Find Your ProtocolYour gut is home to over 100 trillion microorganisms — a complex ecosystem that governs not just digestion, but your immune system, mood, energy, and even cognitive function.
Modern life — stress, processed foods, antibiotics, environmental toxins — strips away the beneficial bacteria your body depends on. Tundrex delivers hardy, spore-forming Bacillus subtilis strains that survive the journey and actively rebuild your microbiome from the inside out.
Join thousands who've discovered the power of Siberian-sourced Bacillus subtilis. Your microbiome — and your body — will thank you.
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