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The foundational Tundrex probiotic — delivering potent Bacillus subtilis sourced from pristine Siberian tundra soil. Active in the small intestine, where it helps support microbiome balance and immune function.
Tundrex 1.1 is the core product in the Tundrex family — a spore-forming probiotic supplement featuring Bacillus subtilis, a highly resilient strain of bacteria sourced from untouched organic tundra soil in Siberia. Unlike many conventional probiotics, Tundrex 1.1 survives the harsh journey through stomach acid to deliver active bacteria directly where needed in the digestive tract.
Its spore-forming nature means it remains stable at room temperature for up to two years — no refrigeration required. Each 50-capsule box provides a complete 10-day course, recommended every 3–4 months for ongoing immune and gut support.
Active Ingredient: Bacillus subtilis (sourced from organic Siberian tundra soil)
Serving Size: 5 capsules
Servings per Box: 10
Shelf Life: 2 years at room temperature
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Unlike fragile Lactobacillus strains, Bacillus subtilis forms protective spores that survive harsh stomach acid, arriving viable and active exactly where they’re needed in your digestive tract.
Bacillus bacteria are naturally found in soil and are important members of the human microbiome family — but often missing from modern diets due to over-sanitization and processed foods.
The endosporal form is the key to Tundrex’s efficacy — a protective shell that allows the bacteria to safely travel through stomach acid and activate in the intestine to deliver probiotic benefits.
Developed in the late 1980s–90s, this technology has been researched, tested, and successfully marketed worldwide for over three decades — long before probiotics became mainstream.
Take Tundrex with a meal for best results. It is a food supplement — not a medication — so no specific timing is required.
Take 5 capsules per day for 10 days. For optimal results, space them evenly: one capsule approximately every 4 hours.
Example: 7 am, 11 am, 3 pm, 7 pm, 11 pm — or create your own schedule. Continuous intake throughout the day is advisable, but not required.
Repeat the course every 3–4 months to maintain maximum immune and microbiome support.
Tundrex 1.1 is used in every protocol. Choose the one that matches your health goals.
The entry-level protocol — one box of Tundrex 1.1 for daily immune system support. Repeat every 3–4 months.
A 20-day intensive protocol with Tundrex 1.1 + Tundrex 3 to restore disrupted microbiome balance. Save 10%.
A comprehensive 35-day protocol with Tundrex 1.1, 3, and 4 for full microbiome restoration. Save $25.
"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."
"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."
Verified buyers share their experiences with Tundrex 1.1.
"Started with the Immunity Boost protocol — one box of Tundrex 1.1 over 10 days. I've now done it four times, once per quarter. My immune system has been noticeably stronger. I went through an entire winter without getting sick, which never happens."
"The small intestine targeting is what sold me. I have a history of upper digestive issues — bloating right after eating, cramping, the works. Tundrex 1.1 addressed exactly that. Three courses in and it's night and day."
"Post-antibiotic recovery is where this really shines. Finished a course of antibiotics and started Tundrex 1.1 the next day. My gut bounced back in about two weeks instead of the two months it usually takes."
"I appreciate that this isn't some fancy 50-strain blend with a lot of marketing behind it. It's one well-researched organism, sourced cleanly, in the right dose. Simple, effective, and the science actually checks out."
"The energy improvement surprised me most. I didn't expect that from a probiotic, but it makes sense given the gut-brain connection. About a week into my first course I noticed I wasn't hitting that 2pm wall anymore."
