Pro-B11

Pro-B11

Microbiome balance

Stress Resilience Gut Defense

22 Billion CFUs | 11 Clinically Studied Strains


🌿 Maximum Gut Support, Daily

Formulated with 22 billion CFUs and 11 carefully selected probiotic strains to restore balance and support total digestive wellness.


Powerful Strain Profile Includes:

  • Lactobacillus plantarum
  • Lactobacillus casei subsp. casei
  • Lactobacillus paracasei
  • Lactobacillus rhamnosus
  • Lactobacillus acidophilus
  • Streptococcus thermophilus
  • Bifidobacterium lactis
  • Bifidobacterium bifidum
  • Bifidobacterium breve
  • Bifidobacterium infantis
  • Bifidobacterium longum


Why Pro-B11?

  • Helps reduce symptoms of GI distress
  • Supports a more balanced microbiome
  • Replenishes good bacteria lost to stress, poor diet, or antibiotics
  • Promotes smooth digestion and nutrient absorption

 

Feel the Difference—From the Inside Out

Your daily defense for digestive comfort, immune health, and gut harmony.

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Soothes Gut Inflammation
Restores Microbial Balance
Supports Immune Function
Promotes Digestive Comfort
$24.99 USD
$24.99 USD
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Built on Proven Microbiome Science

Clinically Studied Adaptogens & Nutrients for Total Gut Balance
Science-Backed Formulas Clinically studied ingredients for real results.
Satisfaction Guaranteed 180-day money-back promise for risk-free wellness.
Restore Your Gut Now
Targeted Species Formulated with 11 specific probiotic species shown in studies to support those with IBD and IBS by restoring gut flora balance.
Optimal Dosage Each capsule delivers 22 billion CFUs — a potency aligned with clinical research for noticeable digestive health improvement.
Smart Delivery Delayed-release capsules are designed to survive stomach acid and reach the intestines intact where they’re needed most.
Gut Resilience Supports the intestinal lining, reduces inflammation, and promotes microbiome diversity for long-term digestive strength.
Targeted Species Formulated with 11 specific probiotic species shown in studies to support those with IBD and IBS by restoring gut flora balance.
Optimal Dosage Each capsule delivers 22 billion CFUs — a potency aligned with clinical research for noticeable digestive health improvement.
Smart Delivery Delayed-release capsules are designed to survive stomach acid and reach the intestines intact where they’re needed most.
Gut Resilience Supports the intestinal lining, reduces inflammation, and promotes microbiome diversity for long-term digestive strength.
Restore Your Gut Now

Pure Ingredients, Sensational Experience

Every Capsule is packed with carefully selected, plant-based ingredients to deliver a natural, powerful, targeted solution.

Lactobacillus acidophilus 800 mg

Supports nutrient absorption and gut lining.

Bifidobacterium longum 20mg

Promotes bowel regularity and immune health.

Bifidobacterium bifidum 800 mg

Helps reduce inflammation in the colon.

Lactobacillus rhamnosus 8mg

Protects gut lining from harmful bacteria.

Lactobacillus plantarum 5mg

Balances microbiota and reduces bloating.

Streptococcus thermophilus 7mg

Aids digestion and supports lactose breakdown.

Lactobacillus acidophilus 800 mg

Supports nutrient absorption and gut lining.

Bifidobacterium longum 20mg

Promotes bowel regularity and immune health.

Bifidobacterium bifidum 800 mg

Helps reduce inflammation in the colon.

Lactobacillus rhamnosus 8mg

Protects gut lining from harmful bacteria.

Lactobacillus plantarum 5mg

Balances microbiota and reduces bloating.

Streptococcus thermophilus 7mg

Aids digestion and supports lactose breakdown.
Empower Your Health with Pure Ingredients
NO CHEMICALS
SUSTAINABLE
vegan-friendly
TOXIN-FREE
CRUELTY-FREE
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Intestinal Fortitude provides top quality supplements. I have seen profound results in my clients when using their various formulas. They are thoughtfully created and do fantastic things to heal the gut. I was thrilled to discover Intestinal Fortitude and will be using their products forever!

Emily D., Functional Nutritional Therapist

Better Ingredients. Better Science. Better Results.
Not all supplements are created equal. See why our formulas stand out with superior ingredients, purity, and effectiveness.
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Backed Science

Clinically Proven Blend

Gut-Focused

Personalized Solutions

Proven Results

Pure & Clean Formula

Zero Artificial Additives
No Unnecessary Fillers
Zero preservatives
Zero Soy
Zero Common Allergens
Zero Gluten

Decades of Science in Every Capsule

Backed by cutting-edge research, our formulas combine the latest advancements in gut health and inflammation support. We use only the most effective, clinically studied ingredients to help you feel your best every day.
Feel Better
Science-Backed Wellness
Clinically Clean Formulas
Targeted Gut Support
Rigorously Lab Tested

the Intestinal Fortitude 180-Day Healthier You Guarantee.

We stand behind the quality and effectiveness of all our products. If you try any of our supplements and feel they aren’t the right fit for you, we offer a 180-day, no-questions-asked, money-back guarantee.
Frequently Asked Questions

It supports healthy digestion, balances gut bacteria, and strengthens immunity.

Yes. Our supplements are made with high-quality, natural ingredients.

Results can vary depending on your body and health goals. Some people experience noticeable improvements in digestion, recovery, or energy within a week, while deeper gut support and healing may take a few weeks of consistent use.

For Pro-B11, take 1 capsule daily. We recommend taking them in the morning with food or as directed by a healthcare professional. Always follow the instructions on the label and consult your physician if unsure.

Yes, it’s safe for daily use and designed for long-term gut support. If you have any medical conditions or are on medication, it's always wise to consult with your doctor before starting supplementation.

Real Stories, Real Results
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JESSICA CARTER
"I’ve struggled with chronic gastritis for years. After trying the ‘Reduce, Repair, Rebuild’ bundle and switching to a clean diet, my pain has mostly stopped. It’s a game-changer, and I finally have hope!"
Feeling Better Than Ever!
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SOPHIA MARTINEZ
"These supplements have made my symptoms much milder than before. I’m noticing a real improvement!"
Balanced & Refreshed
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ETHAN COLLINS
"Just 12 hours after my first dose, I drank my morning coffee without pain or cramping. I’m excited to continue using AI-5 and GLR-6!"
Supports My Routine
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AMELIA FOSTER
"I had acid reflux and microbiome issues for months. GLR-6 helped a lot, and adding AI-5 and L-Glutamine made it even better. I’m still tapering off PPIs, but I see great progress!"
Great Product, Slight Taste
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Customer Reviews

Based on 60 reviews
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Oscar Vasquez
Helps me tolerate more diverse food

I’m currently taking the GLR-6 and the Pro-B11 and they have helped me recover from an IBS flare very quickly, I started first with the GLR-6 upping the daily dose until reaching the 4 daily capsules, and when that was tolerated without issues I started with half a capsule per day of probiotics for 6 days because I get a bit bloated and gassy when starting on new probiotics. When eating outside I take an extra capsule of the probiotics and I have noticed that this helps me tolerate better the restaurant meals which might have a lot more oils and fats than what I’m used to at home.

The stool consistency has greatly improved, which correlates with better food digestion. I’m pretty happy with the probiotics, I see myself taking them indefinitely, since I have been feeling much better and as long as they are available I see them as an investment in my physical and mental health.

K
Kenneth Rosen Rosen
Pro-B11

I have had problems with my colon and my Gastroenterologist recommended this because of its strength.
I have been very happy with the results. Now my lady partner and her son also take it.

P
Patricia Wright
Pro-B11

I take the Pro-B11 along with the Prebiotic GOLD.
Great combo. I will continue ordering both!

D
Donna Wrabiutza
Awesome products and service!

I feel sooo much better! I will be a lifelong client!

S
Sara_Fahmi_
Good probiotics

Easy to swallow, flavorless, can see the results immediately in the comfort in the digestive system, also a good probiotic will reflect on the skin complexion (this one did!)

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