Rated 4.5/5, by 20,000+ Satisfied Customers
Gut Health Reinvented – Reduce, Repair, Rebuild.
Support your gut with powerful, all-natural ingredients.
Experience relief, recovery, and renewed digestive health.
Feel Better
180-Day Money Back Guarantee
Rated 4.5/5, by 20,000+ Satisfied Customers
Gut Health Reinvented – Reduce, Repair, Rebuild.
Support your gut with powerful, all-natural ingredients.
Experience relief, recovery, and renewed digestive health.
Feel Better
180-Day Money Back Guarantee
Targeted Support for Total Gut & Body Health
anti-inflammatory
Gut-lining repair
Microbiome
colostrum
L-Glutamine
1
Why We Created It
Inflammation affects everything—pain, digestion, recovery. We wanted a natural, effective solution without the side effects.
2
What Makes Us Different
We use a multi-pathway approach, combining Berberine, Boswellia, Curcumin, Ginger, and more in optimal dosages. No black pepper (piperine) or preservatives—just pure, potent ingredients.
3
How to Use It
Take three capsules daily with a meal. Consistency is key for lasting relief. Feel better, naturally!
Feel Better
180-Day Money Back Guarantee
1
Why We Created It
Your gut lining is essential for digestion, immunity, and overall well-being. However, stress, poor diet, and toxins can weaken it, leading to discomfort and health issues. We created this formula to help restore and strengthen your gut barrier naturally.
2
What Makes Us Different
Our blend includes powerful ingredients like L-Glutamine, Zinc, and Aloe Vera, which work together to repair and protect your gut lining. Free from artificial additives, gluten, and soy, our formula supports long-term gut health.
3
How to Use It
Take two capsules daily with a meal. Consistent use helps rebuild your gut lining, improve digestion, and enhance nutrient absorption.
Feel Better
90-Day Money Back Guarantee
1
Why We Created It
Traditional probiotics don’t always survive the harsh gut environment. We developed Co-Biotics to provide superior gut support, combining prebiotics, probiotics, and postbiotics for complete digestive balance.
2
What Makes Us Different
Unlike typical probiotics, our formula delivers resilient, clinically studied strains that support a healthy gut microbiome. Combined with prebiotics for nourishment and postbiotics for enhanced absorption, Co-Biotics offers triple-action gut support.
3
How to Use It
Take one capsule daily with water, preferably before a meal. For best results, use consistently to strengthen gut flora and improve digestion.
Feel Better
90-Day Money Back Guarantee
1
Why We Created It
Your immune system starts in the gut. Colostrum is packed with immunoglobulins and growth factors that help strengthen immunity, promote gut repair, and support overall wellness. We created this formula for optimal gut and immune health.
2
What Makes Us Different
We source high-quality, bioavailable colostrum rich in lactoferrin, peptides, and antibodies. This ensures maximum effectiveness in restoring gut integrity and boosting immune defense.
3
How to Use It
Mix one scoop with water or a smoothie daily. Regular use supports gut healing, immune strength, and overall vitality.
Feel Better
90-Day Money Back Guarantee
1
Why We Created It
L-Glutamine is a key amino acid that fuels gut cells, aids in muscle recovery, and supports immune function. We formulated this to help restore gut lining, reduce inflammation, and improve overall gut health.
2
What Makes Us Different
Our L-Glutamine is ultra-pure and easily absorbed for maximum effectiveness. Free from fillers and additives, it provides clean, targeted support for gut and muscle recovery.
3
How to Use It
Take one scoop mixed with water or juice daily. Best taken on an empty stomach for optimal absorption and gut support.
Feel Better
90-Day Money Back Guarantee
Restore. Rebuild. Thrive.
shop all
best seller
bundles
Sale
Sale
Sale
Sold out
Sold out
Intestinal Fortitude Hooded Sweathshirt
$30.00
Whether you're a #UCwarrior a #Crohnsathlete or #IB....
Sale
Sale
Sale
Sale
Pure. Powerful. Proven.
No preservatives, no allergens, no fillers—just clean, science-backed ingredients for better gut health and total wellness.
Feel Better
90-Day Money Back Guarantee
Zero
Preservatives
Zero Animal
Products
Zero
GMO
Zero
Soy
Zero
Fillers
Zero
Gluten
Clean choices, healthy outcomes
Make clean, natural choices that lead to healthier, more vibrant living. Our commitment to purity ensures you enjoy the best benefits without compromise.
Improves Digestive
Comfort
Say goodbye to bloating, gas, and irregularity with targeted gut support.
Backed by
Clinical Research
Every ingredient is chosen based on real science, not hype.
Transparent
Labeling
Clean formulas with no hidden additives.
Effective
Results
Proven ingredients for real benefits.
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.
Gut Lining Repair– Inflammation
& Recovery Support
A maximum strength formula to soothe irritation and feed the repair process.
vegan friendly
gluten free
100% real
lab tested
No Black Pepper
Non-GMO
Powerful Healing
Combines Slippery Elm, Marshmallow Root, and Licorice Root
Eases Digestion
Reduces bloating and discomfort
Faster Recovery
Supports post-meal gut healing
Gut Lining Repair
Strengthens and protects digestive tract
AL-5 – Advanced Gut &
Immune Support
A science-backed blend for total gut health and immune resilience.
vegan friendly
gluten free
100% real
lab tested
No Black Pepper
Non-GMO
Microbiome Balance
Supports a healthy gut ecosystem
Supports Full-Body Inflammatory Response
Helps reduce systemic inflammation for better recovery, digestion, and overall wellness.
Reduces Inflammation
Helps calm gut irritation
Better Absorption
Formulated for maximum nutrient uptake
Pure & Natural
Free from soy, gluten, and artificial additives
Colostrum – Nature’s Ultimate
Gut & Immune Support
Pure New Zealand colostrum with 90+ bioactive compounds for whole-body resilience.
vegan friendly
gluten free
100% real
lab tested
No Black Pepper
Non-GMO
Heals & Protects Your Gut
Strengthens intestinal lining to combat leaky gut and inflammation.
Supercharges Immunity
Packed with immunoglobulins to defend against viruses and infections.
Grass-Fed & Hormone-Free
Sourced from New Zealand’s cleanest pastures—no additives or fillers.
Boosts Energy Naturally
Users report sustained vitality without crashes or jitters.
Ancient Remedy, Modern Science
Ancient Remedy, Modern Science
PREbiotic GOLD – Precision Fuel
for Your Gut’s Best Bacteria
A science-backed blend for total gut health and immNew Zealand Gold Kiwifruit Pectin to nourish, diversify, and balance your microbiome—without the bloat.une resilience.
vegan friendly
gluten free
100% real
lab tested
No Black Pepper
Non-GMO
Targets Good Bacteria Where It Matters
Feeds F. prausnitzii to reduce inflammation and heal gut lining.
No Bloat, No Discomfort
Slow fermentation avoids gas and cramping from cheap prebiotics.
Boosts Healing Butyrate
Strengthens gut lining and improves nutrient absorption.
2 Kiwis in 1 Capsule
Pure, concentrated pectin—no fillers or allergens.
Perfect Probiotic Partner
Pair with PRO-B11 for maximum gut health benefits.
L-Glutamine – Essential
Fuel for Gut Repair
An amino acid powerhouse for digestive health, immunity, and muscle recovery.
vegan friendly
gluten free
100% real
lab tested
No Black Pepper
Non-GMO
Gut Barrier Support
Repairs and strengthens intestinal lining
Reduces Inflammation
Helps ease digestive discomfort
Immune Boosting
Supports overall wellness and resilience
Enhances Absorption
Improves nutrient intake and digestion
100% Pure
No fillers, additives, or artificial ingredients
PHAGE 1 – Targeted
Gut Defense
A revolutionary bacteriophage formula designed to clean up bad bacteria and tip the balance toward the good bacteria.
vegan friendly
gluten free
100% real
lab tested
No Black Pepper
Non-GMO
Smart Bacteria Targeting
Targets harmful bacteria while preserving good microbes
Digestive Comfort
Supports gut health and reduces bloating
Stronger Gut Barrier
Strengthens gut lining for long-term health
Clinically Proven
Backed by studies for real results
Clean & Safe
Non-GMO, gluten-free, and vegan-friendly
PHAGE 1 – Targeted
Gut Defense
A revolutionary bacteriophage formula designed to clean up bad bacteria and tip the balance toward the good bacteria.
vegan friendly
Grown in the USA
dairy free
No refrigeration
Balanced blend
Non-GMO
Smart Bacteria Targeting
Targets harmful bacteria while preserving good microbes
Digestive Comfort
Supports gut health and reduces bloating
Stronger Gut Barrier
Strengthens gut lining for long-term health
Clinically Proven
Backed by studies for real results
Clean & Safe
Non-GMO, gluten-free, and vegan-friendly
GLR-6
AI-5
COLOSTRUM
PRE-GOLD
l-glutamine
PHAGE-1
PRO-B11
Smarter Supplements. Better Results.
Crafted for maximum effectiveness, our formulas go beyond ordinary pills with science-backed ingredients and targeted benefits.
Feel Better
90-Day Money Back Guarantee
Fast-Absorbing
Designed for optimal absorption and bioavailability, ensuring your body gets the nutrients it needs without waste.
Clinically Proven Ingredients
Every capsule is packed with research-backed ingredients that support gut health, immunity, and overall wellness.
No Unnecessary Additives
Free from fillers, artificial preservatives, and common allergens—just pure, potent support for your health.
NO gmo
NO gluten
no animal derivatives
no tree nuts
no preservatives
no colorings
Smarter Supplements. Better Results.
Crafted for maximum effectiveness, our formulas go beyond ordinary pills with science-backed ingredients and targeted benefits.
NO gmo
NO gluten
no animal derivatives
no tree nuts
no preservatives
no colorings
Feel Better
90-Day Money Back Guarantee
the Intestinal Fortitude 180-Day Healthier You Guarantee.
We stand by our products—experience real results or get your money back, no questions asked.
Risk-Free – Try it for 180 days, worry-free.
Real Results – Feel the difference in your gut health.
Customer First – Your satisfaction is our priority.
No Hassle – Love it or get a full refund.
Feel Better
90-Day Money Back Guarantee
What Our Customers Are Saying
Rated 4.9/5, by 10,000+ Satisfied Customers
“Game-Changer for My Gut Health!”
"I struggled with bloating for years. Within weeks, my digestion improved, and I felt lighter and more energized!"
Sarah M.
86 reviews
AI-5
“Finally, a Supplement That Works!”
"I’ve tried so many gut health products, but this is the only one that delivered lasting results. My digestion and energy are better than ever!"
Jessica P.
220 reviews
AI-5 + GLR-6
"Finally Found Relief After Years!"
"I've struggled with gut inflammation and IBS for over a decade. After trying countless supplements and diets, AI-5 is the first thing that’s actually helped. Within three weeks, my bloating went down, the cramps eased up, and I finally feel like I can eat without fear again. Highly recommend it to anyone who’s tried everything else."
Jason R.
3 reviews
Centurion
"Noticeable Difference Within Days"
"I was skeptical at first, but this stuff works. I noticed better digestion and less stomach acid by the end of the first week. The fact that it’s all-natural and made in the USA gives me extra peace of mind. I’m already on my second bottle and will keep using it as part of my daily routine."
Aljon V.
86 reviews
AI-5
"Great Natural Option"
I wanted something natural to help with inflammation and gut health—AI-5 exceeded my expectations. It’s gentle, effective, and I’ve noticed less bloating and more regularity.
Kyrie B.
220 reviews
AI-5 + GLR-6
"Took a Few Weeks, But Worth It!"
"I didn’t see results right away, but after about three weeks I started noticing major improvements in how my stomach felt after meals. Patience paid off—definitely recommend giving it time to work."
Gemini B.
3 reviews
Centurion
"Skeptical at First, Now I'm Hooked"
"I was hesitant to try another supplement, but this one really helped with my gut discomfort. I’m more energized, less gassy, and my digestion has improved a lot. Plus, no weird side effects."
Christine R.
86 reviews
AI-5
"Love That It’s Clean and Transparent"
"What stood out to me was the clean ingredient list. I’m super picky about what I take, and AI-5 checks all the boxes. No junk, no mystery fillers—just real stuff that works."
Aiza R.
220 reviews
AI-5 + GLR-6
"Helped My Gut Bounce Back"
"After dealing with months of gut issues, Intestinal Fortitude supplements gave me real relief. My digestion improved, the discomfort eased, and I finally feel like my system is getting back on track. Great quality and clean ingredients—I’m sticking with this brand."
Juliana D.
3 reviews
Centurion
Risk-Free Wellness, Guaranteed
Free Shipping
Enjoy fast, free shipping on all orders over $50.
Money-Back Guarantee
Not satisfied? Get a full refund—no questions asked.
trusted-organization
Backed by science and loved by thousands.
Who Doesn't Want A Little Intestinal Fortitude?
Shop NowExcellent product from and Excellent company
"I did an extensive search for the best product with the best combination of ingredients and found it here with GLR-6. Fantastic ingredients and the measurements of those ingredients are the best I've found "
Maresa
Best Sellers
GLR-6
$39.99Shop Now
Combo Pack
AI-5 + GLR-6
$59.98Shop Now
Colostrum
60 Capsules
$27.99Shop Now
Our Products
AI-5
90 Capsules
$29.95Shop Now
L-Glutamine
300 Grams
$29.99Shop Now
L-Glutamine
500 Grams
$39.99Shop Now
PREbiotic Gold
30 Capsules
$24.99Shop Now
PRO-B11
30 Capsules
$24.99Shop Now
PHAGE 1
30 Capsules
$24.99Shop Now
Sarah
Such A Big Difference!
"The last two months have been so much better. My belly does not cramp as much, it does not bloat as much. It's been pretty great!"
Watch Video
Colin
Big Time Gamechanger!
"I've gone vegetarian, I cut out red meat, I cut out alcohol, I cut out coffee... The only relief I've gotten has been from GLR-6"
Watch Video
Jackie
It Works!
"I've had over 30 years experience with ulcerative colitis and stomach issues. I've tried everything under the Sun, and this product is the real deal!"
Watch Video
