For ambitious professionals who are building consistent routines, a well-chosen fiber supplement can be a low-lift, budget-friendly upgrade that supports better energy and focus over time. You can also pair fiber with high-quality probiotics and zinc.

In our guide to the best fiber supplements of the year, Fortune’s testers evaluated four fiber options using our supplement testing methodology. We looked at formulation, taste, mixability, third-party testing, side effects, and value per serving, so ambitious professionals can choose a product that fits both their health goals and preferences.

Why Trust Fortune

Our team of expert testers has tried hundreds of the most popular supplements on the market today, using our comprehensive supplement testing methodology to find the best products to find the best products for ambitious professionals who want credible, long-term health upgrades—not hype.

Best Fiber Supplements of 2026

• Best Fiber Supplement Overall: Momentous Fiber+
• Best Gummy Fiber Supplement: Grüns
• Best Value Fiber Supplement: Nutricost Prebiotic Fiber
• Best Soluble Fiber Supplement: MRM Nutrition Whole Food Organic Fiber

Best Fiber Supplements Comparison Table

Fiber Supplements	Amount of Fiber	Other Ingredients	Form	Serving Size	Third-Party Testing
Momentous Fiber+	6 g	Psyllium husk,  Resistant potato starch, rice bran hull, cinnamon bark powder, sunflower lecithin, Reb M	Powder	2 scoops	Yes
Grüns	6 g	60+ ingredients ranging from prebiotics to antioxidants	Gummy	1 pack (8 gummies)	Yes
Nutricost Prebiotic Fiber	7 g	Organic agave inulin powder, organic flaxseed powder, and more	Powder	1 scoop	Yes
MRM Nutrition Whole Food Organic Fiber	6 g	Organic acacia fiber, organic apple fiber, organic baobab fruit, organic agave inulin, alpha-galactosidase digestive enzyme	Powder	1 scoop	Yes

Momentous Fiber+
Amount of Fiber	6 g
Other Ingredients	Psyllium husk,  Resistant potato starch, rice bran hull, cinnamon bark powder, sunflower lecithin, Reb M
Form	Powder
Serving Size	2 scoops
Third-Party Testing	Yes
Grüns
Amount of Fiber	6 g
Other Ingredients	60+ ingredients ranging from prebiotics to antioxidants
Form	Gummy
Serving Size	1 pack (8 gummies)
Third-Party Testing	Yes
Nutricost Prebiotic Fiber
Amount of Fiber	7 g
Other Ingredients	Organic agave inulin powder, organic flaxseed powder, and more
Form	Powder
Serving Size	1 scoop
Third-Party Testing	Yes
MRM Nutrition Whole Food Organic Fiber
Amount of Fiber	6 g
Other Ingredients	Organic acacia fiber, organic apple fiber, organic baobab fruit, organic agave inulin, alpha-galactosidase digestive enzyme
Form	Powder
Serving Size	1 scoop
Third-Party Testing	Yes

Best Fiber Supplement Overall: Momentous Fiber+

Our Thoughts on Momentous Fiber+

Momentous Fiber+ is our pick for the best fiber supplement overall—in large part because our tester didn’t experience any side effects in her digestive system during testing. She’s sometimes sensitive to food and supplements with high amounts of fiber but didn’t experience any discomfort after trying Momentous Fiber+. She would take this product long-term for fiber supplementation, which speaks to how well it works. 

And, we think this is a great-tasting fiber supplement that’s good for folks who struggle to get enough fiber from their diet alone.

Paige tested Momentous Fiber+, rating it a 5 out of 5 for her first impression. “The aesthetics of the product are very minimalist and clean,” she said. “The container may be a little bulky to take on the go; the bottle is quite wide. The container is very easy to open and close.”

As this is not the most travel-friendly package, professionals who are often on the road or in the air to meet up with colleagues in other locales may prefer a different option from our list, such as the Grüns Superfood Gummies.

When it comes to mixability, Paige was pleased, rating Fiber+ a 5 out of 5. “The product easily dissolves in a shaker bottle, which was surprising because it’s a coarser supplement. I didn’t have to shake it for longer than a minute, and there were minimal chunks after mixing,” she said. 

Paige tried the pure cinnamon flavor. “It’s very unique: it reminds me of cereal,” she said. “I was pleasantly surprised by this flavor, and it would likely pair well with a protein powder or coffee.” She liked the slightly sweet taste and strong cinnamon flavor, though it wasn’t too overpowering. “There’s no bad aftertaste or unpleasant texture, either. The powder made the liquid slightly thicker,” Paige said, rating the taste 5 out of 5.

Specs:

• Amount of fiber: 6 g
• Form: Powder
• Serving size: 2 scoops
• Third-party testing: Yes

Best Gummy Fiber Supplement: Grüns

Our Thoughts on Grüns

Grüns Superfood Gummies are our pick for the best gummy fiber supplement because not only do they include six grams of fiber, but also a host of other vitamins, minerals, and nutrients. 

Think of Grüns as a multivitamin that includes fiber. For an emerging professional who is still building consistent habits, this all-in-one approach means you can support digestion, energy, and general wellness with a single, low-friction step in your day instead of juggling multiple supplements.

They’re available as low-sugar or sugar-free, and limited flavors frequently come out, such as the Grüns x Popsicle Firecracker flavor (Writer’s note: They taste just like the nostalgic Firecracker pop—I tried them!). Right now, the limited-edition flavor is raspberry lemonade. 

Carter tested Grüns Superfood Gummies in the original flavor. When it comes to taste, he rated Grüns a 5 out of 5. “These taste like gummy bears, but slightly less artificial,” Carter said.

Grüns gummies have great reviews online; they have an average rating of 4.3 out of over 6,900 Amazon reviews. “People love the convenience, the taste, and the energy boost they get from the gummies,” says Carter. “The gummies have a 4.8 average rating on the Grüns website, with users mentioning the digestive benefits and flavor.” If you’re price-conscious, those high ratings can make this feel like a lower-risk, smart upgrade to your routine.

He hasn’t experienced any side effects from Grüns, giving the gummies a 5 out of 5 for adverse effects.

“The company is fully transparent about its testing processes and third-party use, but the specific third party is not mentioned anywhere on their website,” Carter said. (Writer’s note: During my research, I couldn’t find the COAs online or third-party testing information, either.)

Specs:

• Amount of fiber: 6 g
• Form: Gummy
• Serving size: 1 pack (8 gummies)
• Third-party testing: Yes

Best Value Fiber Supplement: Nutricost Prebiotic Fiber

Our Thoughts on Nutricost Prebiotic Fiber

Nutricost Prebiotic Fiber is our pick for the best value fiber supplement because each container contains 57 servings—and costs just 38 cents per scoop. It’s the most economical fiber supplement on our list, which makes it especially appealing if you are early in your career and trying to stretch a wellness budget without sacrificing quality. 

This fiber supplement comes as a powder that you mix with water to drink; it’s available as unflavored or fruit punch, so you can keep it simple by adding to your morning or post-work gym routine.

Pete, a certified nutrition coach and CrossFit athlete, tested Nutricost’s Prebiotic Fiber. He rated his first impression a 5 out of 5, noting: “This fiber supplement comes in a white plastic container. Inside, there’s a scoop with a long handle, which made scooping out the supplement much easier considering the narrow opening. Overall, the container is appropriately sized at roughly 6 inches tall and 3.5 inches wide, making it easy to store without taking up much space.” 

For a younger professional sharing an apartment with roommates or juggling a home office and gym gear, this compact footprint and practical scoop design make it simple to keep this on your counter without adding additional clutter.

Our tester rated mixability a 3 out of 5. This fiber supplement dissolved “very well” during the initial one-minute shake. “There was some very slight settling that was visible at the bottom of the shaker bottle. After a second one-minute shake, there was still a very small amount of undissolved product at the bottom of the shake,” Pete said. “However, this didn’t affect the mouthfeel at all. While I was drinking the fiber supplement, I didn’t notice any grit and the consistency was smooth.” 

For emerging achievers who are sneaking in your protein or other supplements between meetings or before a workout, this smooth texture means you can make it an easy part of the workday, drinking it quickly and moving on with the rest of your day.

Pete rated the taste a 3 out of 5. “This product is unflavored, and it really was essentially unflavored when mixed in water,” he said. “You can tell there’s something mixed in the water, but there is no real noticeable taste or flavor. Overall, the mixability was good, and the mouthfeel was smooth. Only during the last few sips did I notice any slight grit from the very small amount of undissolved powder.”

Our tester didn’t experience any side effects or digestive issues after taking Nutricost’s Prebiotic Fiber.

Specs:

• Amount of fiber: 7 g
• Form: Powder
• Serving size: 1 scoop
• Third-party testing: Yes

Best Soluble Fiber Supplement: MRM Nutrition Whole Food Organic Fiber

Our Thoughts on MRM Nutrition Whole Food Organic Fiber

MRM Nutrition Whole Food Organic Fiber is our pick for the best soluble fiber supplement because it contains five grams of soluble fiber and one gram of insoluble fiber. This matters because both types of fiber are beneficial for your body: soluble fiber dissolves to help slow digestion and support your healthy cholesterol levels. Insoluble fiber doesn’t dissolve, helping to move food and waste through your digestive system faster. 

For an ambitious, mid-career professional who is past the “any fiber works” stage, this balanced profile makes MRM’s Organic Fiber feel more like a strategic upgrade to support digestion, regularity, and cardio health in one scoop instead of having to take a bunch of different supplements.

Paige tested this fiber supplement, rating her first impression of it a 3 out of 5. “While the packaging is fun and colorful, it comes in a bag instead of a container. This makes it easy to store, but potentially more difficult to get all the product out when using the scoop,” she said. “The top is resealable, but some product does get stuck in the seal.”

The instructions were easy to read and follow. You add one scoop to at least 10 ounces of liquid. Paige rated the ease of following instructions a 5 out of 5. For someone actively building better routines, those specific mixing ideas make it easier to habit stack: you can fold fiber into your existing routines like a morning smoothie, afternoon yogurt, or pre-commute water rather than starting a new regimen.

When it comes to mixability, this fiber supplement dissolved fully within a minute of shaking with minimal chunks and separation. She rated it a 5 out of 5 in this category.

Paige didn’t experience any side effects. “I felt great after taking this supplement, and I do think it helped with gastrointestinal regulation,” she said. “Some fiber supplements upset my stomach, but I didn’t experience any issues with this product. I’d definitely incorporate this fiber into my daily routine and mix it with different foods.” If you’re optimizing for steady energy and focus at work, this combination of being gentle on the stomach and helpful for regularity makes MRM a smart, next-step upgrade as your nutrition routine gets more sophisticated.

Specs:

• Amount of fiber: 6 grams
• Form: Powder
• Serving size: 1 scoop
• Third-party testing: Yes

Why Fiber Supplements Matter to Professionals 

Adequate fiber intake supports regular digestion, helps stabilize blood sugar, and promotes healthy cholesterol levels. Fiber can help reduce a mid-afternoon energy slump and provide more consistent energy for meetings, travel, and focused work blocks.

Because many professionals rely on takeout, travel meals, or desk snacks, even health-conscious people can struggle to consistently reach daily fiber targets. The best fiber supplements offer a controlled, repeatable way to add several grams of fiber to your day, which can make it easier to maintain focus, keep gastrointestinal issues from derailing important days, and support long-term cardiometabolic health.

How We Tested and Selected the Best Fiber Supplements

Here’s what our testers consider during and after trying the fiber supplements.

Taste and Texture

For powder fiber supplements, testers considered mouthfeel, grittiness, and whether the fiber supplement dissolved well in liquid. They also noted the sweetness level and taste, if any.

Formula

We worked with an RD during testing to find the most effective, safest fiber supplement formulas. We aimed for doses of around six to seven grams of fiber, which is a good complement to the fiber you get from food. Our team also aimed to avoid fiber supplements with artificial sweeteners, fillers, or other additives.

Third-Party Testing

We select products that are third-party tested. The FDA doesn’t regulate supplements like it does food and prescription drugs, so it’s preferable to get third-party tested supplements to ensure safety and ingredient quality.

Value

If you’re building a better routine on a budget, Nutricost and MRM offer the lowest cost per serving while still delivering six to seven grams of fiber.

Fiber supplement	Fiber per serving	Cost
Momentous Fiber+	6 g	$39.95
Grüns	6 g	$79.99
Nutricost Prebiotic Fiber	7 g	$21.97
MRM Nutrition Whole Food Organic Fiber	6 g	$15.89

Momentous Fiber+
Fiber per serving	6 g
Cost	$39.95
Grüns
Fiber per serving	6 g
Cost	$79.99
Nutricost Prebiotic Fiber
Fiber per serving	7 g
Cost	$21.97
MRM Nutrition Whole Food Organic Fiber
Fiber per serving	6 g
Cost	$15.89

Benefits of Fiber Supplements

Current guidelines recommend about 25 grams a day of fiber for women and 38 grams per day for men. If you are missing those marks, here are some benefits of fiber supplements:

• Help to keep your digestive system regular
• May help lower LDL cholesterol levels
• May keep you full for longer, supporting weight management

What to Avoid in Fiber Supplements

Here are a few things to avoid when shopping for a fiber supplement.

• Fiber supplements with proprietary blends that don’t disclose the amounts of each ingredient
• Products with added sugar, artificial ingredients, or fillers
• High doses of fiber that push you above the daily recommended amount 

How to Find the Best Fiber Supplements for You

Here’s how to shop for the best fiber supplement for you.

Your Wellness Goals

Think about your overall health goals: are you working to improve your digestive health and regularity? Fiber may also help lower your LDL cholesterol, keep your blood sugar stable, and keep you fuller for longer. 

Flavors

While many fiber supplements are unflavored, there are flavored options out there. Think about what you’d prefer and consider if you’d like to stack any other supplements along with your fiber (like a protein shake). 

Form

Consider how you’d like to take your fiber supplement each day: as a capsule, gummies, or a powder mixed in with a liquid or smoothie. If you’re frequently on the go, gummies may be a good pick. You can also check to see if the brand has travel packets available.

Cost

Supplements can be expensive, so keep your budget in mind when shopping. Cleaner formulas are often more expensive. If you’re going to be taking a fiber supplement daily, our team thinks it’s a good investment in your health.

Fortune’s Final Thoughts

Fiber is frequently overlooked, especially for professionals. It can provide steadier energy, keep your digestion regular, and potentially lead to better long-term health. The right fiber supplement can help you reach your recommended daily dose of fiber.

If you pick a fiber supplement that fits your budget and daily routine, it can be one of the simplest, highest-impact upgrades you make to support better focus, digestion, and long-term health as your career grows.

Frequently Asked Questions

What is the best form of fiber to take?

There isn’t one best type of fiber to take; both soluble and insoluble fiber have benefits for your gut health.

Can I take fiber and berberine together?

We recommend talking with your doctor about taking fiber and berberine together. If you do decide to add both to your routine, we think a best practice is to space them out rather than taking them at the same time.

How can I get 100% of my fiber daily?

When possible, it’s best to get your fiber through whole foods, ensuring that you have some fiber at each meal throughout the day. A fiber supplement can be a great way to reach your fiber goal, though it should be a complement, not the only source of your fiber intake.