Fiber supplements have been shown to restore regularity, ease bloating, and support weight loss. This article looks at the top fiber supplements of 2025, considering factors like ingredients, sugar content, and price per serving. Here are our top 5 picks.

As we reviewed each fiber supplement, we considered five important criteria:

1. Fiber Source: The two main types of dietary fiber are soluble fiber and insoluble fiber. It’s critical that you get both types of fiber if you want to reap the full benefits of adding a fiber supplement to your regimen. That means a product that includes both soluble and insoluble fiber to aid digestion, weight loss, regularity, balanced blood sugar, healthy cholesterol, prevent occasional constipation, and much more. 

2. Fiber Quality: The quality of fiber matters. Steer clear of supplements with artificial colors, flavors, stabilizers, and other chemical additives. Instead, opt for a natural, whole-food fiber. 

3. Sugar Content: A high-quality fiber should have 0 grams of added sugar. Yet surprisingly, if you look at some of the most popular brands you’ll see that sugar—not fiber—is their number one ingredient. They claim to help with blood glucose, yet they contain as much as 16 grams of table sugar per serving. That equates to four full teaspoons of sugar—and more than half of what your daily intake should be. So it’s critical to double-check the sugar content on the back of the label before adding any fiber supplement to your shopping cart.

4. Price Per Serving: A fiber supplement should be affordable enough to purchase for months and years to come. Yet, some supplements come with a steep price tag (like $75 for just 30 servings), which makes it challenging to keep purchasing month after month. For this reason, we provide a “price per serving” for each fiber supplement listed.

5. Trustworthy Brand: In a world saturated with expensive supplements, buying from a brand that believes in transparency and trustworthiness is essential. That said, when purchasing any fiber supplement, ensure it was produced in the USA in a certified GMP (Good Manufacturing Practice) facility and is third-party tested for purity and potency.

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Whole-Food Fiber Source 

Contains Both Types of Fiber

Promotes Regularity

Reduces Constipation

Supports Weight Loss

Zero Sugars, Fillers, & Artificial Sweeteners

Naturally Sweetened with Stevia

Delicious Natural Citrus Flavor

Third-Party Tested & cGMP Compliant

Made in the USA with Global Ingredients

Less Than $1/Serving

Bulk Discounts + Free Shipping

365-Day Money-Back Guarantee

Native Fiber is the only fiber supplement we could find that meets our standards and uses an organic, whole-food source delivering both soluble and insoluble fiber. It’s the cleanest product we found by far and contains zero fillers, artificial sweeteners, sugar, or preservatives. A daily scoop of Native Fiber can help ease occasional constipation, bloating, support gut microbiome, healthy digestion, blood sugar, and cholesterol. We were impressed with its premium ingredients—and affordable price. That’s why Native Fiber easily secured the #1 spot on our list for the best fiber supplements of 2025.

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“I can’t believe it’s so tasty! I added it to bubbly water and made a super fizzy drink! I was very pleased the next morning when I woke up and headed to the bathroom. Native Fiber did the trick so I just ordered more. I won’t go without it!”

— Marsha K., NativePath Verified Customer, 01/23/2024

“Been on it for 5 days and so far it performs much better than Metamucil!”

— William T., NativePath Verified Customer, 02/27/2024

Customer results have not been independently verified. Individual results may vary.

Sugar-Free

Only Delivers Soluble Fiber

Contains Prebiotic Fiber

Mixability Issues

Manufactured in an NSF Certified Facility

Expensive

Sliding into second place is the Thorne Fibermend® Prebiotic Fiber. It’s gluten and sugar free, which we like. But its formula primarily delivers prebiotic soluble fiber—and a negligible amount of insoluble fiber. This means that customers looking for help with regularity and constipation should still take a separate product containing insoluble fiber to bridge that gap. In addition, some customers complain they have trouble mixing it into liquid and don’t like the flavor. Thorne prides itself on quality, and manufactures this product in an NSF Certified facility. 

High in Calories

Contains Both Soluble & Insoluble Fiber

Gritty Texture

USDA Certified Organic

Unpleasant Flavor

Gluten-Free

Allergens

Taking third place is the Garden of Life Raw Organic Fiber. It boasts 15 organic superfoods and is both gluten and sugar free, which we think sets it apart. But its long list of ingredients also delivers a high calorie count per serving and possible allergens, which might make it unappealing to some consumers. Some customers also report dissatisfaction with the flavor and gritty texture. 

USDA Certified Organic

Unmasked Psyllium Flavor

Low Cost Per Serving

Gritty Texture

Additive Free

May Cause Gas & Bloating 

Must Be Taken With Plenty of Fluid to Avoid Constipation 

Potential Allergen for Some Individuals (psyllium)

Coming in at fourth place is Viva Naturals’ Organic Psyllium Husk Powder. We like that this is an inexpensive, straightforward, organic fiber with one simple ingredient and no artificial flavors or additives. However, its simplicity is a double-edged sword—with many users complaining that psyllium’s natural flavor and texture are unpleasant and make it difficult to consume. It’s important to drink plenty of water with all fiber supplements, but especially so with psyllium to avoid gas, bloating, and constipation. Some people are allergic to psyllium and should avoid products that contain it. 

Sugar-Free

Contains Maltodextrin

Low Cost Per Serving

Gritty Texture

No Artificial Colors

Not Organic

Undisclosed Ingredients 

May Cause Gas & Bloating 

Must Be Taken With Plenty of Fluid to Avoid Constipation

In fifth and final place is Metamucil’s Premium Blend Sugar-Free 4-in-1 fiber supplement. Delivering an inexpensive daily dose of fiber without sugar or artificial coloring. Unfortunately, with any psyllium product, you run into concerns around gas, bloating, and constipation. So it's best to start with a low dose and plenty of fluids. We are never a fan of undisclosed ingredients, and unfortunately, this product hides behind the term “natural flavors” rather than revealing the specific ingredients it uses. We also don’t like that it contains maltodextrin—a carbohydrate made with intensive chemical processing. Anyone with a psyllium allergy should avoid this product. 

Dietary fiber comes from fruits, vegetables, legumes, and other plants you eat. Unlike fats, protein or carbohydrates, your body can’t absorb fiber. But as it passes through your digestive tract it provides a host of health benefits.

There are two types of fiber: soluble and insoluble. Soluble fiber dissolves in water, becoming a gel-like substance that helps you feel fuller longer, reduces the amount of fat you absorb from foods, and helps balance blood sugar and cholesterol. It also improves gut health by feeding your gut’s healthy bacteria and strengthening your microbiome. 

Insoluble fiber on the other hand, helps bulk up stools, moves waste through the intestines, promotes regularity, and helps prevent occasional constipation and hemorrhoids. 

Both types of fiber are critical not only for good digestive health, but overall health and vitality.

By taking a premium fiber supplement daily, you may experience the following science-backed benefits:

Healthy cholesterol

Strong gut microbiome

Healthy bowel movements

Balanced blood sugar

Weight loss support

Better overall digestion

To recap, there are five important criteria to consider when shopping for a fiber supplement…

1. Check the fiber source and aim for a product that delivers both soluble and insoluble fiber. 
2. Avoid fiber supplements with artificial colors, flavors, and sweeteners. An organic, whole-food fiber is always best.
3. Stay away from products with added sugar.
4. Aim for a product that costs less than a dollar per serving.
5. Always choose a trustworthy brand, preferably produced in the USA in a certified GMP (Good Manufacturing Practice) facility and is third-party tested for purity and potency.

“Such a fantastic product! I bought NativePath’s Native Fiber and after using it for just a month, it has regulated my bowel movements. I feel less bloated and my stomach is flatter too. I also bought one for my sister and she also loves it!”

—Karlene P., NativePath Verified Customer, 01/21/2024

“Every product I've tried didn't work. No matter how much I took. Native Fiber started working in just two days. Now I will always buy it!”

—Sue T., NativePath Verified Customer, 03/07/2024

“First time I have been regular since going on my medication. Wonderful doesn't even describe it.”

—Mardie M., NativePath Verified Customer, 05/05/2024

“Native Fiber is the BEST fiber. Great for my colon, digestion, and immune system. It’s even easier to sleep. Love the nutrients!”

—David A., NativePath Verified Customer, 03/09/2024

“I LOVE IT! Native Fiber is just wonderful! It is totally natural, delicious and effective. THANK YOU!”

—Margaretta S., NativePath Verified Customer, 03/30/2024

Customer results have not been independently verified. Individual results may vary.

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The information contained within this site is not intended as a substitute for professional medical advice. If you have, expect to have, or suspect you may have any medical condition, you are urged to consult with a health care provider. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any diseases or medical conditions. Results are based on the Natural Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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