REBUILD YOUR GUT

A daily prebiotic fiber blend that goes beyond keeping you regular – supporting long-term gut health & full body benefits.

Smooth BMs • No Bloating • Lower Cholesterol • Healthy Metabolism

Smooth BMs
Lower Cholesterol

No Bloating
Healthy Metabolism

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3rd Party Tested

Made in USA

FREE 2-Day Shipping

30-Day Money Back Guarantee

DIETARY FIBER – ENDORSED BY EXPERTS FROM:

The Only Daily Fiber

For Whole Body Health

Restore Digestive Balance

Helps regulate digestion and stool formation.

Regular BMsLess bloatingLess gas

Fuel Your Gut Microbiome

Feeds the beneficial bacteria in your gut.

Improved digestionBetter moodHealthier skin

Strengthen Metabolic Health

Supports balanced blood sugar and energy levels.

Steady energyLower cholesterolFewer cravings

Restore Digestive Balance

Helps regulate digestion and stool formation.

Regular BMs Less bloating Less gas

Fuel Your Gut Microbiome

Feeds the beneficial bacteria in your gut.

Improved digestion Better mood Healthier skin

Strengthen Metabolic Health

Supports balanced blood sugar and energy levels.

Steady energy Lower cholesterol Fewer cravings

CORE FIBER

STARTER KIT

One-Time Purchase

No FREE shipping
No Free Gifts

Upgrade Your Health with Superior Fiber

Gentle digestion & regularity
Reduce bloating
Sustained energy, no jitters
Feel fuller longer
Zero Sugar, Nothing Artificial
Prebiotic Fiber

PERFECT FOR:

Water
Coffee
Smoothies
Oatmeal
Yogurt

Core Fiber is for those looking for more than “just staying regular.” It’s fiber for doers. Those who are active, busy, and want more out of life.

More Fiber, More Support:
Each serving delivers 6g of fiber—more than most powders or gummies—so you get real digestive support you can feel.

Soluble & Insoluble Fiber:
Core Fiber includes both types of fiber your body needs. Soluble fiber feeds your gut microbes and supports smoother digestion. Insoluble fiber helps keep everything moving—naturally and effectively.

Built for Real Life:
Whether you’re lifting, working, parenting, or all of the above, Core Fiber fits right in. It supports digestion, nutrient absorption, and all-day energy—so you can feel lighter, stronger, and more balanced.

Clean, Easy, Effective:
No artificial flavors. No fillers. Just a gut-friendly blend that mixes fast, tastes great, and actually works.

Core Fiber is made with a blend of five all-natural, plant-based fibers selected for their numerous prebiotic benefits and gut-friendly profile. These include: acacia fiber, green banana resistant starch, resistant potato starch, chicory root inulin, and oat beta glucan.

Core Fiber contains:

NO sugar
NO artificial ingredients
NO gluten
NO soy
NO dairy
NO GMOs

It is also vegan and keto-friendly.

Science
Fiber is one of the most well-studied and widely recommended nutrients in human health, with thousands of clinical studies supporting its role in digestion, microbiome health, metabolic function, and even skin clarity and immune support. Core Fiber is formulated in collaboration with leading MDs and PhDs to deliver the most effective types and forms of fiber—no filler ingredients, no gimmicks. Just real results rooted in science.

Third Party Testing
Our products undergo rigorous testing to ensure quality and purity. We work with highly accredited labs to verify that Core Fiber meets all label claims and passes contaminant screenings for pesticides, heavy metals, and microbial contaminants.

Certifications
Manufactured in SQF, GMP, and FDA certified facilities in the U.S., and thoroughly tested for heavy metals and contaminants.

Core Fiber's Unflavored fiber powder uses all-natural ingredients to deliver a mild, slightly sweet and nutty taste. It's designed to mix easily into water, smoothies, or shakes—no grit, no weird aftertaste.

Mix one scoop with 8-12 oz of water or your favorite beverage (or food!) daily. For best results, take it consistently—ideally around the same time each day. Increase to 2-3 scoops daily for maximum effect.

New to fiber? Start with half a scoop for the first 4 days to let your body adjust, and make sure you’re drinking plenty of water.

Poop better: Supports smoother, more regular digestion.

Less bloating: Helps you feel lighter and less gassy.

More energy: Helps stabilize blood sugar and maintain consistent, steady levels.

Fewer cravings: Supports appetite regulation and healthy eating habits.

Support lean body mass: Complements high-protein diets and active lifestyles

Fiber Deficiency:

A Modern Epidemic

Over 95% of people don’t get enough fiber.  When fiber is missing, digestion suffers, energy drops, cravings rise, and metabolism slows.

Prebiotic fiber is the biggest missing piece of the modern diet. Your gut needs soluble and insoluble fiber. And you need fiber from multiple sources.

The challenge? Getting enough prebiotic fiber from food alone is hard. It requires a daily diet that includes a wide range of fruits, vegetables, legumes, and whole grains.

Core Fiber makes it easy to get the diverse, prebiotic fiber your gut needs — supporting long-term gut health and whole-body benefits.

Fiber Deficiency:

A Modern Epidemic

Daily Fiber Intake

*Average of National Academy of Medicine’s recommendation for men (38g) and women (25g)

**Based on 1-2 serving of Core Fiber, plus typical diet

Clinically-Studied Ingredients

5 Prebiotic Fibers. 1 Complete Gut Solution.

Different fibers do different jobs. Our ActiveFiber Blend combines multiple prebiotic ingredients to support digestion, metabolism, and energy—not just regularity.

Green Banana Resistant Starch

Fuels beneficial gut bacteria deep in the colon.

Healthier microbiome Better digestion Gut–brain support

Acacia Fiber

Feeds good gut bacteria and supports digestive comfort.

Less bloating Improved regularity Easier digestion

Oat Beta Glucan

Slows digestion to support metabolic and heart health.

Lower cholesterol Steadier energy Stable blood sugar

Chicory Root  Inulin

Promotes regularity and gut balance.

Regular BMs Reduced gas Gut balance

Resistant  Potato Starch

Supports insulin sensitivity and natural GLP-1 production.

Fewer cravings Metabolic support Energy stability

Green Banana Resistant Starch

Fuels beneficial gut bacteria deep in the colon.

Healthier microbiome Better digestion Gut–brain support

Acacia Fiber

Feeds good gut bacteria and supports digestive comfort.

Less bloating Improved regularity Easier digestion

Oat Beta Glucan

Slows digestion to support metabolic and heart health.

Lower cholesterol Steadier energy Stable blood sugar

Chicory Root  Inulin

Promotes regularity and gut balance.

Regular BMs Reduced gas Gut balance

Resistant  Potato Starch

Supports insulin sensitivity and natural GLP-1 production.

Fewer cravings Metabolic support Energy stability

TRY IT NOW

NON GMO

NO SUGAR

3rd PARTY TESTED

100% NATURAL

WHAT TO EXPECT WITH DAILY USE

DAY 7

Fiber is improving stool consistency, helping digestion move smoothly.

Easier poops
More regular BMs
Gentler digestion

Day 14

Prebiotic fermentation increases, reducing gas buildup and helping normalize digestion.

Less bloating
Less gas
Fewer cravings

30 Days +

A healthier gut microbiome begins supporting energy balance and the gut–brain connection.

Steadier energy
Better mood
Improved nutrient absorption

90 Days +

Long-term gut support starts influencing metabolism, immunity, and overall health.

Healthier cholesterol
Stronger immune function
Metabolic health support

Most Gut Products Only Treat Symptoms

Ours Works at the Core

Scroll to see the full table →

Core Fiber

Leading Fiber Supplements

Laxatives

Probiotics

Short-term symptom relief

Supports regular BMs

Reduces bloating & gas

Supports gut microbiome balance

Feeds beneficial gut bacteria

Energy & metabolic support

Risk of dependence

Gut Microbiome + Performance Nutrition Experts

Our Scientific Advisory Board

Dr. Alex Carrasco, MD

Nutrition, Integrative & Functional Medicine

Dr. Ava Mainieri, PhD

Dir. of Clinical Outcomes at Midi Health

Dr. Keith Garleb, PhD

Abbott Labs, Center for Nutrition

Amanda Phillips, RD, CSSD

Chief Performance Innovation Officer at Exos

We're fast! Orders typically ship within 24 hours and on average arrive 2 days later. You could be experiencing the amazing health benefits just 3 days from now.
Each bottle comes with 30 servings of Core Fiber plus a measuring scoop. We recommend ordering on subscription. You get better pricing, and we'll make sure you're always stocked up so you never miss a day.
While the timeline for experiencing the benefits of Core Fiber can vary from person to person, most people generally start to feel the effects within 1-2 hours. After 1-2 weeks of consistent daily use, you should experience noticeable health benefits. Continued consistent daily use is essential for long-term results.
We want you to have the best experience with Core Fiber. Returns rarely happen, but we do have a great policy in place. You can return any unopened bottles within 30 days of your first order for a refund or exchange. For all refund requests, you will receive the full value of your order, less $5 return shipping. Submitting a return is easy, and we accept all returns in policy. No questions asked. If you have specific questions for your returns or exchange circumstance, our Support team is happy to help! You can reach them at help@corefiber.co. This policy applies only to your initial purchase.

NO QUESTIONS? TRY COREFIBER NOW