Which protein bar has the most fiber?

Of the bars we checked against their current labels in October 2026, Julian Bakery’s Pea Protein Bar has the most: 19 grams of fiber in a 60-gram bar, followed by its Whey Protein Bar at 18 grams and No Cow’s Chunky Peanut Butter bar at 17.

How much fiber is in a Quest bar?

Between 11 and 15 grams in the Quest Protein Bar flavors we checked. Chocolate Brownie lists 15, Mint Chocolate Chunk 14, and Cookies & Cream, White Chocolate Raspberry and Blueberry Muffin 13. Most of it is polydextrose, an added fiber.

Why do protein bars have so much fiber?

Mostly because of added fibers such as soluble corn fiber, polydextrose and tapioca fiber, which add bulk with few calories and count as dietary fiber on the label. Every bar on this list names one of them near the top of its ingredients.

What counts as “high fiber” on a label?

Under FDA rules, a label can call a food “high” in fiber, or an “excellent source,” when a standard serving has 20 percent or more of the Daily Value, about 5.6 grams.

How much fiber should you eat a day?

The Daily Value on US labels is 28 grams of fiber, for a 2,000-calorie diet, according to the FDA. Most adults eat far less: about 16 grams a day on average, according to USDA’s What We Eat in America survey.

Is added fiber as good as the fiber in whole grains?

Both count on the label, and the FDA counts an added fiber only after accepting evidence that it has a health benefit. They are not identical, though: some added fibers, like chicory root fiber (inulin), ferment quickly, and in studies of healthy adults larger doses caused gas in many people. Each product on this page is tagged so you can see which kind it relies on. This is educational information, not medical advice.

The Fiber Rankings

The Highest-Fiber Protein Bars, Ranked

Every bar here has at least 10 grams of protein. We started from every protein bar filed with the USDA, added the big sellers the file misses, checked each one against its current label and ranked them by grams of fiber per bar.

Labels checked October 11, 2026 · Started from 2,453 products in USDA’s database · Method below

Photo: Alex Saks / Unsplash

Every bar near the top of this list gets most of its fiber the same way: an added fiber high on the ingredient list, such as soluble corn fiber, polydextrose or tapioca fiber. That is how a 60-gram bar reaches 15 to 19 grams. Julian Bakery leads, at 19 grams for its pea protein bar, followed by its whey and egg-white bars, No Cow at up to 17 and Atkins’ layered bar at 16.

Bars built on whole foods land lower. RXBAR, made from dates and nuts, and Perfect Bar’s dark chocolate almond both list 5 grams, which keeps them off this list. That is the honest trade: on a high-protein bar, the fiber number mostly tells you how much added fiber is inside.

The government’s records were the least reliable in this aisle. USDA’s file listed Perfect Bar’s dark chocolate almond at 17 grams of fiber; the current label says 5, and 17 grams is its sugar. Quest bars filed at 16 to 19 grams now list 11 to 15 after a change of recipe.

Julian BakeryPea Protein Bar, Dark Chocolate

19 gper bar

1 bar (60g) · 190 cal · 0.5 g sugar · 20 g protein

Fiber from: soluble dextrin fiber, organic sunflower butter, cocoa Added fiber

Current label (brand site)
Julian BakeryWhey Protein Bar, Sweet Cream

18 gper bar

1 bar (60g) · 205 cal · 0.5 g sugar · 20 g protein

Fiber from: soluble dextrin fiber, organic sunflower butter Added fiber

Current label (brand site)
Julian BakeryEgg White Protein Bar, Peanut Butter (Almond Butter also 17 g)

17 gper bar

1 bar (60g) · 200 cal · 1 g sugar · 20 g protein

Fiber from: soluble dextrin fiber, organic peanut butter, organic roasted peanut halves Added fiber

Current label (brand site)
No CowProtein Bar, Chunky Peanut Butter (other flavors we checked: 14 to 16 g)

17 gper bar

1 bar (60g) · 210 cal · 1 g sugar · 20 g protein

Fiber from: soluble corn fiber, peanuts, peanut flour Added fiber

Current label (brand site)
AtkinsLayered High Protein Bar, Brownie Delight (Cookie Fusion 15 g)

16 gper bar

1 bar (60g) · 200 cal · 2 g sugar · 15 g protein

Fiber from: polydextrose, soluble corn fiber, almonds, cocoa, cellulose powder, gum arabic Added fiber

Current label (brand site)
QuestProtein Bar, Chocolate Brownie (other flavors we checked: 11 to 14 g)

15 gper bar

1 bar (60g) · 170 cal · 1 g sugar · 20 g protein

Fiber from: polydextrose, almonds, cocoa processed with alkali Added fiber

Current label (brand site)
QuestCandy Bar, Peanutty Caramel

13 gper bar

1 bar (57g) · 210 cal · 2 g sugar · 15 g protein

Fiber from: peanuts, polydextrose, fructooligosaccharides, cocoa processed with alkali Added fiber

Current label (brand site)
TRUBARTRUBAR PRO, Chocolate Pea-nut Job (other PRO flavors 12 g)

13 gper bar

1 bar (60g) · 230 cal · 6 g sugar · 18 g protein

Fiber from: tapioca fiber, peanuts, cocoa powder Added fiber

Current label (brand site)
AtlasReal Food Protein Bar, Peanut Butter Chocolate Chip

12 gper bar

1 bar (54g) · 220 cal · 0.5 g sugar · 20 g protein

Fiber from: tapioca fiber, peanuts, almonds, unsweetened chocolate, peanut flour Added fiber

Current label (retailer listing)
AtkinsHigh Protein Bar, Chocolate Peanut Butter

12 gper bar

1 bar (60g) · 250 cal · 2 g sugar · 16 g protein

Fiber from: polydextrose, peanuts, cellulose powder, cocoa, guar gum Added fiber

Current label (brand site)
think!High Protein Bar, Banana Oat Muffin (other flavors we checked: 10 g)

11 gper bar

1 bar (60g) · 200 cal · 1 g sugar · 20 g protein

Fiber from: polydextrose, almond butter, whole grain oats Added fiber

Current label (brand site)
AlohaProtein Bar, Peanut Butter Chocolate Chip

10 gper bar

1 bar (56g) · 240 cal · 5 g sugar · 14 g protein

Fiber from: peanuts, tapioca fiber, chocolate, roasted pumpkin seeds Added fiber

Current label (brand site)
Kirkland SignatureProtein Bar, Chocolate Peanut Butter Chunk

10 gper bar

1 bar (60g) · 180 cal · 2 g sugar · 21 g protein

Fiber from: soluble corn fiber, peanut butter, isomalto-oligosaccharides, peanut flour, peanuts, cocoa powder Added fiber

Current label (retailer listing)
IQBARProtein Bar, Chocolate Sea Salt

9 gper bar

1 bar (45g) · 180 cal · 1 g sugar · 12 g protein

Fiber from: almonds, tapioca fiber, vegetable fiber, unsweetened chocolate, cocoa Added fiber

Current label (brand site)
KINDProtein MAX, Crispy Chocolate Peanut Butter

9 gper bar

1 bar (62g) · 250 cal · 1 g sugar · 20 g protein

Fiber from: peanuts, tapioca fiber, chicory root fiber, unsweetened chocolate, alkalized cocoa Added fiber

Current label (retailer listing)
Simply ProteinCrispy Bar, Mint Chocolate Chip

7 gper bar

1 bar (40g) · 150 cal · 2 g sugar · 13 g protein

Fiber from: inulin, sunflower seeds, oats, unsweetened chocolate, cashew butter, brown rice crisps, acacia gum Added fiber

Current label (brand site)
ONEProtein Bar, Birthday Cake

7 gper bar

1 bar (60g) · 220 cal · 1 g sugar · 20 g protein

Fiber from: soluble corn fiber, isomalto-oligosaccharides Added fiber

Current label (retailer listing)

Where the fiber comes from

On a Nutrition Facts label, “dietary fiber” adds up two kinds of fiber. One is fiber that is, in the FDA’s words, “intrinsic and intact” in plants: the bran on a wheat kernel, the hull of a flaxseed, whole oats. The other is fiber that has been isolated or made and then added, such as chicory root fiber (inulin), soluble corn fiber, oat fiber or polydextrose. The FDA counts an added fiber only once it has accepted evidence of a benefit, such as lower blood glucose or cholesterol or more frequent bowel movements.

Both kinds count the same toward the number on this page, but they do not always behave the same. Some added fibers ferment fast: in a study of healthy adults, 10 grams of oligofructose, a short-chain form of inulin, noticeably increased gas and other symptoms, and at 20 grams a day of short-chain FOS, six of the eight people in a small Paris study reported excess gas. That is why each product here is tagged “Whole-food fiber” or “Added fiber.” The tag is not a verdict on either kind; it tells you what the number is made of.

All 17 bars here get most of their fiber from an added fiber; the first whole-food bars we checked come in at 5 grams.

How we built this ranking

We started from all 2,453 protein bars in USDA’s FoodData Central Branded Foods database (the April 30, 2026 release), the labels manufacturers and retailers file with the government. We removed impossible records, grouped flavors of the same product (809 product lines) and took the top 30 by fiber on the filed label.

Those records are often years old, and 7 of the top products had been discontinued or could not be found on sale. So we also checked 42 widely sold products in the same aisle that the government file misses or lists under old names. Every product was then checked on October 11, 2026 against the nutrition label its brand, or a major retailer, shows today, and the 17 here are ranked by that current label. Nothing is filled in from memory or from an old record. Regional supermarket store brands (48 records) are left out because most readers cannot buy them; many are close copies of the national products here.

Ranked by grams of dietary fiber per bar, as printed. Serving sizes differ between brands, so each row shows the serving. Labels change: if a package in front of you says something different, the package wins, and we would like to hear about it at editor@guthealthtimes.org. The full catalogue behind this page is our Prebiotic & Fiber Label Index.

Questions people ask

Which protein bar has the most fiber?: Of the bars we checked against their current labels in October 2026, Julian Bakery’s Pea Protein Bar has the most: 19 grams of fiber in a 60-gram bar, followed by its Whey Protein Bar at 18 grams and No Cow’s Chunky Peanut Butter bar at 17.
How much fiber is in a Quest bar?: Between 11 and 15 grams in the Quest Protein Bar flavors we checked. Chocolate Brownie lists 15, Mint Chocolate Chunk 14, and Cookies & Cream, White Chocolate Raspberry and Blueberry Muffin 13. Most of it is polydextrose, an added fiber.
Why do protein bars have so much fiber?: Mostly because of added fibers such as soluble corn fiber, polydextrose and tapioca fiber, which add bulk with few calories and count as dietary fiber on the label. Every bar on this list names one of them near the top of its ingredients.
What counts as “high fiber” on a label?: Under FDA rules, a label can call a food “high” in fiber, or an “excellent source,” when a standard serving has 20 percent or more of the Daily Value, about 5.6 grams.
How much fiber should you eat a day?: The Daily Value on US labels is 28 grams of fiber, for a 2,000-calorie diet, according to the FDA. Most adults eat far less: about 16 grams a day on average, according to USDA’s What We Eat in America survey.
Is added fiber as good as the fiber in whole grains?: Both count on the label, and the FDA counts an added fiber only after accepting evidence that it has a health benefit. They are not identical, though: some added fibers, like chicory root fiber (inulin), ferment quickly, and in studies of healthy adults larger doses caused gas in many people. Each product on this page is tagged so you can see which kind it relies on. This is educational information, not medical advice.

More fiber rankings and tools: Highest-fiber cereals →Highest-fiber granola bars →Highest-fiber crackers →Highest-fiber bread →Your daily fiber target →

Educational reporting on what product labels say. Not medical advice, not a buying guide, and no brand paid to appear or saw this page before it ran.