Latest update: March 17, 2025 - 4 minute read
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The Best Fibers of 2025: A Buyer's Guide
Fiber supplements are sold everywhere, but which one can you trust?
Author's Note: If you’re trying to find the best fiber supplement on the market, you're in the right place. We tested the top 5 fiber brands this year. Is psyllium husk the best? Metamucil, slippery elm, or inulin? I will disclose the biggest mistakes people make when choosing, and which brand carries the top fiber supplement of 2025.
Over the last 10 years, national surveys posted by the US Dept. of Agriculture showed 96% of men and 88% of women are NOT meeting their body's daily fiber requirements. A sharp increase when comparing recent generations.
WHAT IS FIBER?
Fiber is an alternative carbohydrate. Unlike sugar and starch, it can't be broken down by your body. When digested, fiber travels on through the gut – affecting the digestive tract in beneficial ways.
FIBER AFFECTS MANY BODILY SYSTEMS
Nutrient Digestion
Movement of Waste
Blood Pressure
Gut Microbiome
Blood Sugar
Heart + Cholesterol
Metabolism Speed
Normally, we receive fiber through our diet: fruits, veggies, oats, beans, seeds, and nuts. But according to Dr. Stephen O’Keefe, a professor of medicine at the University of Pittsburgh:
"Our collective fiber deficiency is partly because of modern food processing that strips foods of much of their fiber, he said. And as a result, we’re probably missing out on many benefits."
The result is a population where many of us are fiber deficient. As we age, the problem is compounded. Supplementation is commonly suggested by many health practitioners.
In 1 of 185 studies published in 2019, researchers compared people with higher fiber diets with those who followed lower ones.
The studies found that those who ate the most fiber were 16% less likely to get Type 2 diabetes or colon cancer, and 31 percent less likely to develop heart disease.
A QUALITY FIBER SUPPLEMENT CAN
Lower Cholesterol
Relieve Constipation
Slow Diarrhea
Regulate Blood Sugar
Reduce Blood Pressure
Boost Satiety
Aid Weight Loss
In studies, taking fiber supplements lowered blood pressure, cholesterol levels, and body weight while aiding digestion, decreasing hunger, and regulating healthy bowel movements to rid the body of toxic materials.
Some fiber supplements like psyllium husks form a gel-like substance in the stomach reducing hunger and helping you feel satisfied and full even when eating fewer calories.
LOW FIBER CAN CAUSE
Constipation
Bloating
Weight Gain
Heart Disease
Diabetes
Hunger
Low Energy
WHY ARE SOME PRODUCTS MORE EFFECTIVE THAN OTHERS
Magnesium comes in many forms. The human body digests and absorbs them differently depending on what element is bonded to it. Each supplement contains different forms of magnesium, so it is important to check the label and understand the differences.
Glycinate: This is the best form of magnesium on the market because of its incredible absorption rate. It can be taken orally and is said to be the only one to cross the blood brain barrier - deeming it leagues above the rest. This is excellent for muscle cramps, sleep, and stress reduction.
Citrate: Bound with citric acid, citrate is one of the cheapest and most common forms found in supplements today. Absorbable but not as much as glycinate. Good overall product.
Oxide: Bound with oxygen, this isn’t used typically for anything outside of digestive issues.
Chloride: Commonly found in lotions, magnesium chloride is mag bound with chlorine. Not the best oral solution. Used for achy joints.
What Are the Different Types of Fiber?
Fiber comes in many forms and they are not all the same.
Psyllium Husk: Widely considered the best form of fiber on the market, psyllium husk is an all-natural plant-based fiber used primarily as a gentle bulk-forming laxative in products such as Metamucil.
When doctors recommend soluble fiber to their patients, they often suggest psyllium husk. It does not ferment or cause bloating, helps pass stool more easily without causing diarrhea, and forms a gel-like substance in the stomach to reduce hunger and overeating.
Slippery Elm Bark: It has a unique combination of water-soluble and water-insoluble fiber. Slippery elm is an amazing herb for soothing inflammation of the membranes in the digestive system.
As a pre-biotic, it feeds the correct bowel bacteria – lactobacilli and bifidobacteria. It functions as a bowel lubricant and it can relieve both constipation and diarrhea.
Inulin/Chicory Root: Inulin is a soluble fiber that is naturally found in many plants and vegetables. A common source of inulin is chicory root. It is similar to slippery elm and psyllium, but it ferments in the gut, which can cause unwanted side effects like bloating and gas.
HOT TIP
Look for a formula that has psyllium + slippery elm fiber for the best effects. The combination of soluble and insoluble fiber helps support regularity and gut health from multiple angles; while helping you stay full and satisfied without overeating.
WHAT YOU NEED TO WATCH OUT FOR
Not all fiber is created equal. So, before spending your hard-earned money, make sure you don’t make these 4 common mistakes.
Cheap Fiber: Some brands use only chicory based inulin fiber that ferments in the gut. Although bringing some benefits, most will experience gas, bloating, and a larger waistline.
Heavy Metals: Psyllium husk contains a small amount of heavy metals naturally. This is not a big concern - many herbs and seaweeds do. But make sure your fiber product contains the required Prop65 heavy metals alert on the label. If they don't display it, they are not being honest.
Fake Reviews: Do not trust AMZN reviews as they are often bought and fake. This is a pervasive practice called "review farming." Just because a cheap product has great reviews on a big marketplace does not mean it is quality.
Capsules per Serving: Most fiber supplements require 4-5 capsules 2-3x's daily. Unless you want to be swallowing pills 24/7, we'd suggest finding a highly concentrated formula requiring only 3 capsules daily, one time.
WHAT YOU NEED TO WATCH
OUT FOR
Not all magnesium is created equal. So before spending your hard earned money, make sure you don’t buy ineffective, not bioavailable, or even harmful magnesium products by avoiding these common mistakes.
Magnesium blends: Some blend cheaper magnesium types to increase the miligrams per serving. This lowers the absorbability of the supplement and reduces effects.
Unclear labels: The label should breakdown how much total magnesium is included and the amount of bonded magnesium (example: "1,000mgs magnesium glycinate equal to 200mgs of magnesium").
Fake reviews: Do not trust AMZN reviews as they are often bought and fake. This is a pervasive practice called review farming. Just because a product has great reviews on AMZN does not mean it is quality.
Cheap untested products: Chinese products have flooded the market with fake contents and labels. Make sure you have a product made and tested for purity in the USA. Why cut corners when it comes to health? You get what you pay for here.
Best Fiber Supplements of 2025
Psyllium Husk
Psyllium
Husk
Slippery
Elm
3 Caps
Once Daily
Slippery Elm
3 Caps Once Daily
Third Party
Tested
Third Party Tested
90 Day
Guarantee
90 Day Guarantee
Confirmed GMP
Certified
Confirmed GMP Certified
Serving Size Breakdown
Here is an infographic of the daily serving size for each product. As you can see, many popular fibers are plagued with old formulas that require big servings daily. This is because they are only psyllium husk.
The newest efficient fibers contain psyllium and slippery elm combined with other synergistic ingredients.
This allows for benefits without the downside of taking so many capsules.
1: Better Fiber
by Organics Ocean
Based on Customer Reviews
A+
RATING
PROS
Psyllium Husk Fiber
Slippery Elm Fiber
Aloe Ferox + Ginger + Acai
Third Party Tested
3 Capsule Servings
FDA and GMP Registered
90 Day Money Back Guarantee
Vegan Friendly
Subscribe and Save
CONS
Sells Out Often
Only Available on Their Website
The Bottom Line
This is the highest-quality fiber for 2025. It contains two highly effective fibers, psyllium husk and slippery elm, and a lot of them. It's best taken daily over time for constipation, cholesterol, heart health, and hunger-reduction.
Each bottle is 1 month's supply - the formula requires only 3 capsules per serving and contains just one additive. This makes it easier to digest while keeping the daily capsule requirement low.
It also contains aloe ferox, which is 2x stronger than aloe vera and a natural laxative; and a handful of antioxidants, like ginger and acai berry to expel free radicals.
Better Fiber will work best for both men and women searching for a fiber product with more than psyllium alone, without the gas and bloating caused by inulin and other fermenting fibers.
Ocean's products are tested for purity, heavy metals, and salmonella by a third-party lab. It is the only brand on our list that honestly displays the required compliance on their labels.
The one drawback is that the only place to buy Better Fiber is on Organics Ocean's website. Because demand for quality fiber is skyrocketing this year, it can sell out.
Tap the LEARN MORE button below to see promotional pricing for all new customers while getting all the benefits of an efficient fiber blend. They have a 90 day return policy so you have nothing to worry about.
2. Douglas Laboratories Fiber-Plex
B-
RATING
PROS
Slippery Elm Fiber
3 Capsule Servings
GMP Certified
90 Day Guarantee
Third Party Tested
CONS
No Psyllium Husk
Low Fiber Count
Two Fillers
The Bottom Line
This product has a low serving count, slippery elm, and is an efficient "low capsule count" way to improve fiber intake. The company is based in the USA, so they are highly regulated. The product is made in a GMP-certified facility.
There are some downsides to consider. The formula contains no psyllium husk, which should be stable in all fiber blends. The consequence of this is a lower overall fiber count than the others.
The tablets have 2 fillers instead of Better Fiber's 1. This was a difficult product to rank. It could very well be #4 or #5 because it doesn't contain any psyllium husk. But we put it as #2 because of the 3 capsule serving and slippery elm content.
2. ColonBroom Fiber Supplement
B-
RATING
PROS
Psyllium Husk
Good Fiber Dose
Two Different Flavors
GMP Certified
Third Party Tested
CONS
No Slippery Elm
Have to Mix with Water
No Money Back Guarantee
The Bottom Line
This product has a high-fiber count, psyllium husk, and is a decent "non-capsule" way to improve fiber intake. The company is based in the USA, so they are highly regulated.
There are some downsides to consider. The formula contains no slippery elm, which should be a staple in all fiber blends. It also doesn't mix great so if you don't drink it right away, it turns into a blob of gel.
Keep in mind, with any flavored drink, there are always additional additives, flavors, and colors.
There's no money back guarantee displayed on the website.
This was a difficult product to rank. It could very well be #3 or #4 because it only contains psyllium husk fiber. But we put it as #2 because it works well to get the poo moving.
3. Meta Metamucil
C+
RATING
PROS
Psyllium Husk
GMP Certified
Third Party Tested
CONS
20 Capsules per Day
Questionable Customer Feedback
Not Heavy Metal Compliant
Only Contains Psyllium
No Money Back Guarantee
The Bottom Line
This formula contains no artificial additives and is suitable for vegans. Metamucil is a common over-the-counter brand, but this comes with some downsides as they don't seem to pay much attention to their formulas.
It is made in the USA and is GMP-certified. However, the serving size is a customer concern. You have to take up to 20 capsules per day of this stuff.
It contains a lot of psyllium and nothing else, which is why you have to take so many capsules.
Upon further investigation of their label, they aren't heavy metal compliant and don't include the necessary disclaimers. This is why it's ranked #3.
4: Psyllium Husks Veg Caps
C
RATING
PROS
Psyllium Husk
Third Party Tested
GMP Certified
CONS
15 Capsules per Day
Contains Only Psyllium
No Money Back Guarantee
Not Heavy Metal Compliant
The Bottom Line
Yerba Prima has a strong product here in the fiber space. It contains psyllium husk seeds only.
They are a US brand and are GMP certified. There are a few downsides to consider. The daily serving size is 15 capsules per day. They don't use any of the newer more efficient fibers. The label is not heavy metal compliant, and the customer care is outsourced.
We would recommend going with a more modern fiber formula with fewer capsules per serving and domestic customer care. This is why this product is ranked #4.
5. Psyllium 4-in-1 Fiber
C-
RATING
PROS
Psyllium Husk
GMP Certified
Third Party Tested
CONS
Huge Serving Size
Have to Mix with Water
Not Heavy Metal Compliant
No Money Back Guarantee
Contains Only Psyllium
The Bottom Line
This is one of the best-selling supplement brands overall. Their fiber products are popular because they are effective and have deals with all the major grocery chains.
This is another outdated "psyllium only" formula, which is why you need to take so much powder. It doesn't mix great and comes in orange flavor only. If you don't drink it right away, it turns into a blob of gel. The average customer review is fairly low at 3.5/5.
The label isn't heavy metal compliant, and it contains a few additives like aspartame and Yellow 6. These are the reasons this product is ranked last.
2025's Best Fiber Product
Based on Customer Feedback
Better Fiber
by Organics Ocean
Psyllium Husk + Slippery Elm
3 Capsules per Day
Third Party Tested
Only 1 Additive
90 Day Guarantee
Confirmed GMP Certified
Heavy Metal Compliant
References:
DISCLAIMER: This scientific research is for informational purposes only. The results reported may not necessarily occur in all individuals. Rain Media provides this information as a service but does not endorse it. This information should not be read to recommend or endorse any specific products.
https://health.clevelandclinic.org/best-fiber-supplements/
https://my.clevelandclinic.org/health/diseases/4059-constipation?
https://www.ars.usda.gov/ARSUserFiles/80400530/pdf/usual/Usual_Intake_gender_WWEIA_2015_2018.pdf
https://www.nytimes.com/2023/08/14/well/eat/fiber-diet.html
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)31809-9/fulltext
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7117800/
https://www.betterhealth.vic.gov.au/health/healthyliving/fibre-in-food
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