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Tundrex 3 delivers Bacillus amyloliquefaciens — a highly potent probiotic strain — active in the large intestine. It helps normalize the microbiome and support immune defenses, complementing Tundrex 1.1 as part of comprehensive recovery protocols.
Tundrex 3 is the second member of the Tundrex probiotic family, delivering Bacillus amyloliquefaciens — a potent, spore-forming strain that is active specifically in the large intestine. While Tundrex 1.1 (Bacillus subtilis) works in the small intestine, Tundrex 3 extends probiotic support through the entire colon, helping to normalize microbiome composition and support immune defenses throughout the lower digestive tract.
Tundrex 3 is used as the second phase in both the Microbiome Recovery and Return to Well-Being protocols — taken after completing a Tundrex 1.1 course. Together, they work synergistically across the full digestive system.
Active Ingredient: Bacillus amyloliquefaciens (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.
Tundrex 1.1 (Bacillus subtilis) works in the small intestine. Tundrex 3 (Bacillus amyloliquefaciens) works in the large intestine. Tundrex 4 (Bacillus amyloliquefaciens) works in the small intestine. Used together in protocols for complete digestive tract coverage.
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.
Tundrex 3 is taken after completing a Tundrex 1.1 phase. In the Microbiome Recovery protocol, this means finishing 10 days of Tundrex 1.1 before starting Tundrex 3.
Take 5 capsules of Tundrex 3 per day for 10 days. Space capsules evenly — one capsule approximately every 4 hours.
Example: 7 am, 11 am, 3 pm, 7 pm, 11 pm — or choose your own consistent schedule. Taking with food is recommended.
Follow the full protocol as part of Microbiome Recovery (every 20–24 weeks) or Return to Well-Being (every 12–24 weeks).
Tundrex 3 is included in these two protocols — used as the second phase after Tundrex 1.1.
The entry-level protocol featuring Tundrex 1.1 only — for daily immune support. Does not include Tundrex 3.
A 20-day protocol: 10 days of Tundrex 1.1, then 10 days of Tundrex 3. Designed to normalize disrupted microbiome. Save 10%.
A 35-day comprehensive protocol: 15 days Tundrex 1.1, then 10 days Tundrex 3, then 10 days Tundrex 4. Save $25.
"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."
"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."
Verified buyers share their experiences with Tundrex 3.
"The Microbiome Recovery protocol was exactly what I needed after a prolonged illness and multiple antibiotic courses. Tundrex 1.1 for the first 10 days, then Tundrex 3 for the large intestine phase. The sequential approach made total sense and I felt a real difference."
"I had really irregular digestion — alternating constipation and urgency — that my GI doctor said was dysbiosis. After one full Microbiome Recovery course including Tundrex 3, my patterns normalized significantly. Still doing quarterly maintenance."
"What I like about Tundrex 3 specifically is that it targets the large intestine, which is where my problems have always been. Most probiotics just dump everything in your stomach. The targeted delivery here is smart."
"Did the Return to Well-Being protocol — all three phases. The Tundrex 3 phase was the second leg after 1.1, and I definitely noticed a shift around day four or five of taking it. Less gas, softer stools, better gut sounds overall. TMI maybe, but it worked."
"I'd been reading about Bacillus amyloliquefaciens for the large intestine and was glad to find a product that actually uses it in a meaningful way. Two courses in and my gut health is better than it's been in a decade."
