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Every Tundrex formula is built around the same pristine Siberian Bacillus subtilis strain. Browse individual products or save with one of our multi-phase protocols.
Three distinct products, each targeting a specific part of the digestive tract. Use individually or combined in our protocols for full-spectrum microbiome coverage.
Bacillus subtilis — Small Intestine
The foundational Tundrex product. Delivers Bacillus subtilis — sourced from pristine Siberian tundra soil — active in the small intestine. The starting point for all Tundrex protocols.
Bacillus amyloliquefaciens — Large Intestine
Delivers Bacillus amyloliquefaciens active in the large intestine. Works as Phase 2 in the Microbiome Recovery and Return to Well-Being protocols, extending microbiome support into the colon.
Bacillus amyloliquefaciens — Small Intestine
Delivers Bacillus amyloliquefaciens active in the small intestine. The final phase in the Return to Well-Being and GIT Support protocols — completing the full digestive tract restoration cycle.
Tundrex 1.1 (small intestine) → Tundrex 3 (large intestine) → Tundrex 4 (small intestine again). Used in sequence as part of a protocol, the three products provide complete digestive tract coverage. Each product can also be purchased as part of a bundle protocol to save up to $35.
Pre-packaged protocols combining the right products for your health goal — at a discount. Each includes detailed directions on how to follow the full course.
Tundrex 1.1 (×1) — 50 capsules
Daily immune support & microbiome maintenance. The recommended starting point.
Tundrex 1.1 (×2) + Tundrex 3 (×1)
Intensive gut restoration after antibiotics, illness, or disruption — small & large intestine coverage.
Tundrex 1.1 (×3) + Tundrex 3 (×1)
Deeper restoration with an extended 15-day small intestine phase followed by large intestine support.
Tundrex 1.1 (×3) + Tundrex 3 (×1) + Tundrex 4 (×1)
Full-spectrum microbiome restoration using all 3 Tundrex products. Complete digestive tract coverage.
Tundrex 1.1 (×5) + Tundrex 3 (×1) + Tundrex 4 (×1)
The most intensive protocol — extended 25-day small intestine phase for complete GI restoration.
Not satisfied? Return within 30 days for a full refund — no questions asked.
Complimentary shipping on all orders over $75. Ships within 1–3 business days.
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Reach out to our team. We'll help you find the ideal protocol based on your health history and goals.
* These statements have not been evaluated by the FDA. Not intended to diagnose, treat, cure, or prevent any disease.