Home Ingredients BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)
Immune SupportRespiratory Health

BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)

Evidence Level
Very Strong
2 Clinical Trials
7 Documented Benefits
5/5 Evidence Score

BLIS K12® is a PROPRIETARY STREPTOCOCCUS SALIVARIUS PROBIOTIC STRAIN developed by Blis Technologies (New Zealand) and distributed by Stratum Nutrition in North America — distinguished by 30+ YEARS of published research and proven oral cavity colonization. The world's first advanced oral probiotic. Produces BLIS (bacteriocin-like inhibitory substances). Used for: ear, nose, throat (ENT) health, fresh breath, immune defense, recurrent throat infection prevention, dairy-free version available.

Studied Dose 1 billion CFU/day BLIS K12 (research-validated)
Active Compound Streptococcus salivarius K12 (proprietary strain producing salivaricin A2 and B)

Benefits

Ear, Nose, Throat (ENT) Health

BLIS K12 colonizes oral cavity and supports ENT health — clinical evidence for reduced recurrence of strep throat, ear infections, upper respiratory issues.

Supported by Trial 1, Trial 2

30+ Years Published Research

Robust clinical evidence base spanning three decades of research at multiple institutions.

Supported by Trial 1

Children and Adults Established Safety

Safe and effective for both children and adults — pediatric populations among most-studied for ENT applications.

Supported by Trial 1, Trial 2

BLIS Antimicrobial Production

Produces bacteriocin-like inhibitory substances (BLIS) — salivaricin A2 and B — that competitively inhibit harmful oral bacteria including Streptococcus pyogenes (strep throat).

Supported by Trial 1

Fresh Breath

Modulates oral microbiome reducing volatile sulfur compounds (VSCs) responsible for halitosis.

Natural Immune System Support

Supports natural immune defenses through oral cavity colonization and microbiome balance.

Supported by Trial 2

Dairy-Free Version Available

Recent dairy-free BLIS K12 (developed via Sacco System partnership) makes ingredient accessible to dairy-allergic populations.

Supported by Trial 1, Trial 2

Mechanism of action

1

Oral Cavity Colonization

S. salivarius K12 colonizes oral cavity (tongue, throat, palate) — competitive exclusion of pathogenic bacteria; establishes beneficial bacterial population.

2

Bacteriocin Production

Produces salivaricin A2 and salivaricin B — bacteriocin-like inhibitory substances that selectively kill or inhibit pathogenic streptococci, particularly Streptococcus pyogenes (strep throat).

3

Immune Modulation

Modulates oral cavity immune responses; supports innate immunity at mucosal surfaces.

4

Microbiome Rebalancing

Particularly effective after antibiotic therapy that disrupts oral microbiome — restores beneficial bacterial populations.

Clinical trials

1
BLIS K12 for Recurrent Throat Infections — Multiple RCTs
PubMed

Multiple BLIS K12 RCTs in children and adults with recurrent throat infections.

Children and adults with recurrent strep throat or pharyngotonsillitis.

Significantly reduced recurrence of strep throat infections; reduced antibiotic courses needed.

2
BLIS K12 for Otitis Media — Pediatric Studies
PubMed

BLIS K12 pediatric trials for otitis media (ear infection) prevention.

Children with recurrent ear infections.

Reduced incidence of ear infections; supports pediatric ENT health.

Side effects and drug interactions

Common Potential side effects

Generally extremely well-tolerated.
Mild GI distress (rare).
Allergic reactions extremely rare.
DAIRY allergen in original version — dairy-free version now available.
BACTEREMIA RISK in IMMUNOCOMPROMISED — theoretical risk with all live probiotics; consult.

Important Drug interactions

Antibiotics — kills probiotic; separate timing or take after antibiotic course.
Immunosuppressants — caution with live probiotic in severely immunocompromised; consult.
Pregnancy — generally considered safe; consult.
Lactation — generally safe.
Children — established pediatric safety; primary use population.
DAIRY ALLERGY — use dairy-free version.
Featured In

Symptom-specific supplement guides

🦷Best Supplements for Mouth & Gum Health🛡️Best Supplements for Immune Support

More Immune Support Ingredients

Immune Support
Vitamin C
Vitamin C, also known as ascorbic acid, is a water-soluble vitamin commonly used in supple…
Bone Health
Vitamin D
Vitamin D is a fat-soluble vitamin and steroid hormone precursor essential for calcium abs…
Immune Support
Zinc
Zinc, an essential trace mineral, is commonly supplemented in forms like zinc gluconate, a…
Immune Support
Vitamin A
Vitamin A is a fat-soluble nutrient essential for vision, immune function, and cellular gr…

Frequently asked questions about BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)

What is BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)?

BLIS K12® is a PROPRIETARY STREPTOCOCCUS SALIVARIUS PROBIOTIC STRAIN developed by Blis Technologies (New Zealand) and distributed by Stratum Nutrition in North America — distinguished by 30+ YEARS of published research and proven oral cavity colonization.

What does BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) do?

S. salivarius K12 colonizes oral cavity (tongue, throat, palate) — competitive exclusion of pathogenic bacteria; establishes beneficial bacterial population. In clinical research, BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) has been studied for ear, nose, throat (ent) health, 30+ years published research, children and adults established safety.

Who should take BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)?

BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) may be most relevant for people interested in immune support, respiratory health. It has been clinically studied for ear, nose, throat (ent) health, 30+ years published research, children and adults established safety. As with any supplement, consult your healthcare provider before starting, especially if you have medical conditions or take prescription medications.

How long does BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) take to work?

Most clinical trial effects appear over weeks of consistent use; individual response varies. Acute or same-day effects (where applicable) typically appear within hours, but most cumulative benefits — particularly those affecting biomarkers, mood, sleep quality, or chronic symptoms — require 4-12 weeks of regular use to fully assess. If you don't notice benefit after 12 weeks at the appropriate dose, it may not be your responder.

When is the best time to take BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)?

For immune support, BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) can typically be taken in the morning with breakfast. For acute illness use, follow product labeling — dosing frequency and timing may differ from preventive use. Always check product labeling and follow personalized guidance from your healthcare provider.

Is BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) worth taking?

BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) has strong clinical evidence (Evidence Level 5/5 on NutraSmarts) for its primary uses, with multiple randomized controlled trials and meta-analyses supporting its benefits. Whether it's worth taking depends on your specific goals, what you've already tried, your budget, and your overall supplement strategy. The honest framing: no supplement is essential for most people, and lifestyle factors (sleep, exercise, diet, stress management) typically produce larger effects than any single supplement. BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) is most worth trying if its evidence-supported uses align with your specific goals.

What is the recommended dosage of BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)?

The clinically studied dose for BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) is 1 billion CFU/day BLIS K12 (research-validated). Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) used for?

BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition) is studied for ear, nose, throat (ent) health, 30+ years published research, children and adults established safety. BLIS K12 colonizes oral cavity and supports ENT health — clinical evidence for reduced recurrence of strep throat, ear infections, upper respiratory issues.