Top 5 Prebiotic Fiber Supplements Of 2025

Our Choice

• Easy-to-mix, flavorless powder
• Blend of 4 types of prebiotic fiber
• Soluble and insoluble fiber plus polyphenols
• 90-day money-back guarantee
• Made and third-party tested in the USA with globally sourced ingredients

Based on 3739 Reviews of Primal Harvest

CITATIONS

The gut microbiome refers to the trillions of microbes living in the gut, mostly found in the large intestine. Typically, when people refer to the gut microbiome they are talking about bacteria. The majority of these bacteria are so-called “good” bacteria, also known as probiotics, and are vital for remaining healthy. [2]

Maintaining a balanced gut microbiome, also known as the gut flora, is key to many wellness aspects including digestive, immune, brain, and skin health. An unbalanced gut may even impact sleep quality. [3, 4]

Consuming enough fiber on a daily basis is not only important for our gut, but may also benefit our overall health and well-being. Eating plenty of fiber may even help weight maintenance.*

Lacking dietary fiber can result in some unpleasant digestive effects such as irregularity and feeling backed (or the opposite!)  - and it means missing out on the wide range of health benefits it offers.*

Fiber is a type of carbohydrate that our bodies can’t digest. Sometimes called ‘roughage’ or ‘bulk’, fiber helps to make bowel movement easier to pass by moving along the contents of the intestines. 

Because it is the non-digestible part of plant foods, dietary fiber is naturally found in fruits and vegetables.

Here are the top things to try to avoid when shopping for a high-quality fiber supplement:

What is fiber? 

by Heather's Tummy Care

PROS

• 100% organic acacia powder
• Sustainably sourced
• Gluten-free, plant-based, and FODMAP-friendly
• With soluble fiber

CONS

• No subscribe and save program
• Only one type of fiber

BOTTOM LINE

Organic Acacia Powder by Heather’s Tummy Care is formulated with 100% organic acacia powder. You might appreciate that it contains organic ingredients, however, one downside is that it only contains fiber from one source (acacia gum is primarily soluble fiber). User reports have been mixed on the mixability of this product as some found that it dissolved well while others reported that it was hard to mix and felt disappointed in the product. Additionally, the company does not offer a subscribe and save program which can make it inconvenient to receive the product each month.

3. Organic Acacia Powder

4. Fiber Gummies

by GOGO

PROS

• Contains prebiotic chicory fiber
• Natural flavors
• Plant-based, gluten-free formula
• Fun gummy form

CONS

• Contains added sugars
• Price

BOTTOM LINE

Fiber Gummies by GOGO are a prebiotic fiber gummy supplement featuring fiber from chicory root. They come in an orange-sorbet flavor which most users found tasty. Although these gummy supplements are fun to take, however they also contain added sugars. The lower fiber content and price point of these gummies were other reasons why this lands in fourth on this list. 

by FiberCon

PROS

• No chemical stimulants
• Made in the USA
• Convenient to carry

CONS

• Synthetic fiber
• Large, hard-to-swallow pills

BOTTOM LINE

Fiber Therapy by FiberCon comes in last on our list. This fiber supplement comes in capsule form and is formulated with a type of synthetic fiber called calcium polycarbophil. Although this fiber supplement may help with some digestive issues, it doesn’t provide a source of prebiotic fiber. Additionally, it contains additives making it less premium of a product. You may like the idea behind delivering a fiber supplement in capsule form, however some users said the pills were large and difficult to swallow.* 

2. Organic Psyllium Fiber

by Konsyl

PROS

• All-natural and organic fiber
• Non-GMO, plant-based, and gluten-free
• Also contains iron
• Certified safety & purity testing
• Made in the USA

CONS

• Only one source of fiber (soluble fiber)
• No 90-day money-back guarantee

BOTTOM LINE

Organic Psyllium Fiber by Konsyl is formulated with organic psyllium fiber. Like our number one choice, it also contains organic and natural ingredients, is gluten-free, and suitable for those on a plant-based diet. While this formula does provide a good amount of fiber, it only provides fiber from one source and only contain soluble fiber. This type of fiber may become gooey and gel-like when mixed with liquid, which can make it unpleasant to consume.* 

Primal Prebiotic Fiber by Primal Harvest is a premium, easy-to-mix powdered fiber supplement to help support smoother digestion and regularity, provide weight loss support, and balance out the gut microbiome.* Featuring fiber from four different sources, Primal Prebiotic Fiber is formulated with organic baobab fiber, organic acacia gum fiber, green banana fiber, and apple fiber. What truly makes this fiber supplement stand out is the organic 3-in-1 Fibriss® baobab fiber - an African superfood that delivers soluble fiber, insoluble fiber, and polyphenols. It combines this with the addition of green tea polyphenols, potent antioxidants with many health benefits. Polyphenols may help to boost prebiotic function, making this our favorite from this list.*

Primal Prebiotic Fiber is third-party lab tested and made in the USA with globally sourced ingredients. The brand also offers a convenient Subscribe & Save program which means you can order this unique fiber formula through their convenient and hassle-free subscription service. By signing up for a subscription you get 20% off all products plus free shipping.

The brand’s excellent customer service scores and 90-day money-back guarantee. This product ticked all of our boxes which places it at the number one spot on this list. 

• Prebiotic fiber from 4 quality sources
• Formulated with organic fiber sources
• Contains soluble and insoluble fiber
• Taste-free, fast-dissolving formula
• Plant-based, FODMAP-friendly & gluten-free
• Fair price point
• Third-party tested and made in the USA with globally sourced ingredients

PROS

CONS

• Only available online
• Due to popularity, sometimes runs out of stock

BOTTOM LINE

It is often split into 2 categories:

What is the gut microbiome? 

A+

GRADE

B+

GRADE

B

GRADE

C+

GRADE

C

GRADE

5. Fiber Therapy

DISCLAIMER: This scientific research is for informational purposes only. The results reported may not necessarily occur in all individuals. Primal Harvest provides this information as a service but does not endorse it. This information should not be read to recommend or endorse any specific products.

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[1] Fiber. Fiber | Nutrition.gov. https://www.nutrition.gov/topics/whats-food/fiber. Accessed January 9, 2023. 

[2] Hills RD Jr, Pontefract BA, Mishcon HR, Black CA, Sutton SC, Theberge CR. Gut Microbiome: Profound Implications for Diet…. Nutrients. 2019;11(7):1613. Published 2019 Jul 16. doi:10.3390/nu11071613

[3] Patterson E, Ryan PM, Cryan JF, et al. Gut microbiota…s. Postgrad Med J. 2016;92(1087):286-300. doi:10.1136/postgradmedj-2015-133285

[4] Matenchuk BA, Mandhane PJ, Kozyrskyj AL. Sleep, circadian rhythm, and gut microbiota. Sleep Med Rev. 2020;53:101340. doi:10.1016/j.smrv.2020.101340

[5] Appanna VD. Dysbiosis, Probiotics, and Prebiotics…. Human Microbes - The Power Within. 2018;81-122. Published 2018 Feb 6. doi:10.1007/978-981-10-7684-8_3

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To see a list of our other references, please click here. 

Soluble Fiber

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This type of fiber is water soluble, meaning that it dissolves in water and becomes a gel-like substance. Soluble fiber mixes with digested food, slowing down the absorption of sugar which can help keep blood sugar levels stable. It is also important for healthy cholesterol (and therefore heart health).* [1]

Insoluble Fiber

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This form of fiber does not dissolve in water, making it helpful for encouraging regular bowel movements and preventing constipation. Insoluble helps food pass through the digestive system more quickly and attracts water to stool, making it softer and easier to pass.* [1]

Potential Signs of low fiber intake may include…

• Feeling constipated*
• Experiencing fatigue and tiredness*
• Irregular bowel movements*

• Constantly feeling hungry*
• Straining to pass stool*

Prebiotics are a type of dietary fiber that feed beneficial gut bacteria. Found in certain fruits, vegetables, and whole grains, prebiotics are the non-digestible parts of these plants. Because they can’t be digested, they are able to travel all the way down the gut and feed the probiotics. They help the digestive system work smoothly by providing nutrients for the healthy bacteria in the gut. [5]

What is a prebiotic?

Help or reduce occasional constipation*

Promote regularity*

Support healthy weight management*

What are the benefits of fiber?

Fiber can:

Support healthy cholesterol levels already within normal range*

Support healthy blood sugar levels already within normal range*

Feed “healthy” gut bacteria and support the gut microbiome*[1]

How may prebiotic fiber support our body's needs? 

Prebiotic fiber benefits the body in several different ways, including:

• Supporting gut health by keeping the gut lining healthy*
• Promoting healthy digestion*
• Aiding calcium absorption*
• Supporting stable blood sugar levels already within normal range (which can support energy levels)*
• Encouraging food to ferment and digest which helps with regularity and waste removal*
• Easing digestive issues like occasional bloating and constipation* 
• Promoting healthy weight management*
• Helping to promote the feeling of fullness*

Everyone has individual needs and the experience of making changes in your wellness routine will vary from person to person. Here are some examples of how including more daily prebiotic fiber support may look for different people:

How might you potentially benefit from a fiber supplement?*

1–2 Months

3–6 Months

6+ Months

• Noticing that their digestion felt smooth*
• Feeling satisfied at mealtimes* 

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• Experiencing consistency in regular bowel movements*
• Experiencing digestive comfort*
• Not noticing bloat*
• Feeling full for long*

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• Generally having less digestive issues like bloating and constipation*
• Having support for weight management*
• Generally feeling light and having overall wellness*
• Feeling good in their their gut and digestion*

Note: Individual results may vary. The benefits stated are based on personal experiences and subjective feedback and may vary from person to person.

What To Look For

What To Avoid

Important Criteria

Organic Psyllium Fiber by Konsyl

Organic Acacia Fiber by Heather’s Tummy Care

Fiber Gummies by GOGO

FIber Therapy by FiberCon

Top Fiber Supplements in 2025

Fiber Blend (more than 2 sources)

Soluble Fiber

Insoluble Fiber

Over 5 g fiber

Polyphenols

Good/Neutral Flavor*

Note: We try to update product information as often as we can. Please visit product website for more information. 

*Based on the individual experience of the Smarter Choices team and on a number of user reviews of the product. 

No Gluten

No Dairy

No Added Sugar 

OUR PICKS:

Top Prebiotic Supplements in 2025

90-Day Money-Back Guarantee

Third-Party Tested

Subscription Service

Note: These statements are not intended to diagnose, treat, cure, or prevent any disease or condition, nor are they intended to be substitutes for professional medical health advice. Always consult your physician or other qualified healthcare provider for accurate advice, diagnosis, and treatment plan.

• Unclear Labels: A quality fiber supplement should clearly list exactly what’s included in the formula. Avoid products lacking transparency that don’t list all of the specific ingredients included in the formula. Some fiber supplements may contain gluten, for example, so paying attention to the label is key. It’s also best to avoid supplements that don’t state the source of fiber.
• Missing Safety Testing & Certifications: Choose a supplement that has been independently third-party lab tested and manufactured in the USA. These precautions will guarantee that the product is top quality and free from unwanted extras, such as contaminants, traces of heavy metals, or pesticides.
• False or Misleading Claims: Beware of any supplements that claim their product treats or cures any specific disease or ailment, or promises miraculous, unrealistic, or misleading results. In the case of fiber supplements, some might make promises of instant weight loss, for example. Always speak to your doctor before starting a new supplement routine.
• Suspiciously Cheap Products: When it comes to your health, this is definitely not an area to test out suspiciously cheap products. There are plentiful options to choose from that are high value and still affordable. In this case, you do get what you pay for!