🏆 Top Pick — Best OverallDr. Amy Myers Chewy Chocolate Paleo Bars
14g Fiber 10g Protein 170 cal Gluten-Free Soy-Free Dairy-Free Grass-Fed Collagen
One of the best fiber bars because it contains organic and grass-fed ingredients. It is free of all major allergens and contains low-calorie natural sweeteners including stevia and monk fruit extract. It is also one of the best fiber bars for weight loss because it contains plenty of healthy fats for fullness, a good amount of protein, and filling fibers like chicory root fiber and larch arabinogalactan.
✓ Features
- 14g fiber, 10g protein per serving
- Only 170 calories
- Organic & grass-fed collagen ingredients
- Naturally sweetened, low net carb
- Good for diabetes management
- High ratings for taste & tolerability
⚠ Considerations
- Chocolate flavor can be rich — try Cookie Dough Collagen Bar for a lighter option
- Not vegetarian
- Start with half if new to chicory fiber
💪 Best for Active LifestylesBody Health Mocha Chip Bar
11g Fiber 8g Protein 7 Net Carbs Gluten-Free Dairy-Free Non-GMO Use Code: Heidi20
Body Health Mocha Chip Bars are among the best fiber bars with one of the highest amounts of fiber at 11 grams per serving plus 8 grams of protein. This makes them an excellent option for constipation too. They contain prebiotic fiber from chicory and tapioca, Perfect Amino (all 8 essential amino acids), green superfoods, and monk fruit extract. $3.30/bar, only $2.60 with promo code Heidi20 (save 20%).
✓ Features
- Blondie, Mocha, and Brownie flavors
- 600+ positive reviews
- Only 7 net carbs — great for diabetes
- Kosher, non-GMO, soy-free, egg-free
- Green superfoods included
- 8 essential amino acids
⚠ Considerations
- A bit more expensive without the promo code
- Contains a small amount of caffeine in coffee flavor
- Vegetarian
Best Fiber Bars for Constipation
High-fiber options with prebiotic ingredients to support regularity
🥥 Best Taste — Constipation ReliefCoconut Joy Fiber Bars
7g Fiber 1g Added Sugar Keto-Friendly Paleo-Approved ~$2.80/bar
A delicious fiber bar that resembles the texture of a Mounds bar. Its fiber comes from natural coconut and larch arabinogalactan. Sweetened with allulose and erythritol (which can help reduce constipation), it contains natural preservatives that are actually beneficial — delta tocotrienols and rosemary extract.
Ingredients: Coconut, allulose syrup, erythritol, inulin, unsweetened chocolate, cocoa butter, allulose, sunflower oil, larch arabinogalactan, sea salt, stevia, vanilla, delta tocotrienols, and rosemary extract.
✓ Features
- High-fiber paleo dessert bar
- Only 1g added sugar
- MCTs for energy support
- Prebiotics from inulin & soluble fiber
- Great for keto and candida diets
⚠ Considerations
- Only 1g protein — not ideal if you want protein
- Some people are sensitive to inulin fiber
🌿 Best Grass-Fed Protein + FiberAtlas Protein Bars
12g Fiber 15g Protein 3g Net Carbs No Added Sugar Gluten-Free ~$2.50/bar
Formulated with all-natural ingredients including grass-fed whey protein, allulose, and monk fruit sweetener. It also contains organic ashwagandha, which helps reduce stress, improve sleep, and may even help with memory and concentration. Comes in six flavors including Chocolate Cacao, Peanut Butter Chocolate Chip, Vanilla Almond Chai, and Mint Chocolate Chip.
✓ Features
- 12g fiber, 15g grass-fed protein, 3g net carbs
- Contains organic ashwagandha
- Gluten-free, soy-free, non-GMO
- Thousands of positive reviews
- Suitable for ketogenic diets
- No erythritol or stevia — better tolerance
⚠ Considerations
- Vegetarian (not vegan) — contains dairy
🏆 Highest Fiber — ConstipationDr. Kellyann Collagen Fiber Bars
15g Fiber 4g Protein 1g Added Sugar 3g Net Carbs Grass-Fed Collagen
A great high-fiber bar that stands out for being made with grass-fed collagen. A whopping 15 grams of fiber with chicory root fiber — a root known for its prebiotic content — makes it one of the best options for constipation. Also contains cashew butter, apples, and cinnamon. Sweetened with stevia and a small amount of real cane sugar.
✓ Features
- 15g fiber per bar with prebiotics
- Only 1g added sugar
- Great taste for a superfood bar
- Only 3g net carbs
⚠ Considerations
- Very high fiber — start with half a bar
🥇 Highest Fiber Bar AvailableKeto Collagen Fiber Bar
16g Fiber 4g Protein No Added Sugar 2g Net Carbs Keto & Paleo ~$3.15/bar
The highest-fiber bar in this review — so much fiber that I recommend cutting it in half. These are high-fiber, low-carb, soy-free, gluten-free, and contain no added sugar. Fiber comes from prebiotic coconut fiber, which is excellent for digestion. Contains 100% grass-fed hydrolyzed collagen and is naturally sweetened with stevia. ~$1.60 per half-bar serving.
✓ Features
- 16g fiber — the most of any bar reviewed
- No added sugar, no artificial sweeteners
- Grass-fed hydrolyzed collagen
- Only 2g net carbs — excellent for diabetes
- Soy-free and gluten-free
⚠ Considerations
- Gas and bloating possible if you’re new to fiber
- Not vegetarian
- Not a candy bar in texture
✨ NEW 2025 — Best Sustainable PickFloura Fruit Crush Bars
13–15g Fiber 140–210 cal 0g Added Sugar Gluten-Free Dairy-Free 12 Plants Per Bar
Floura is the most exciting new fiber bar to hit the market in years, created by Jeni Britton, the founder of the beloved Jeni’s Splendid Ice Creams. These bars deliver 13–15 grams of diverse prebiotic fiber from 12 whole plants per bar, using a proprietary “SuperFiber Flour” made from upcycled fresh fruit trimmings — think watermelon rinds, apple cores, and melon peels that would otherwise be discarded. The brand has already diverted 100 million pounds of produce from landfills.
The flavors are genuinely unique: Brambleberry Lavender, Blueberry Matcha, Mango Cardamom, Raspberry Rose, and Vanilla Rooibos — all free from gluten, dairy, refined sugars, emulsifiers, and synthetic flavors. The texture is like a thicker, softer fruit roll — easy to chew with the flavor front and center.
✓ Features
- 13–15g diverse prebiotic fiber from 12 plants
- 0g added sugars, no synthetic ingredients
- Upcycled whole-fruit ingredients — sustainability leader
- Gluten-free, dairy-free, no refined sugar
- Unique, genuinely delicious flavors
- Helps with gut microbiome diversity
⚠ Considerations
- Lower in protein (~3–4g) — not a protein bar
- Higher in total carbs (~28g) due to whole fruit
- Newer product with fewer reviews than established brands
- Best introduced gradually if new to prebiotic fiber
Best Value Protein Fiber Bars
High fiber and protein without breaking the bank
💰 Best Budget PickBulletproof Chocolate Dipped Protein Bars
8g Fiber 7g Protein 3g Net Carbs No Added Sugar Gluten-Free ~$1.30/bar
By far the most reasonably priced high-quality fiber protein bar on the market. Made with cashew butter, inulin, MCT oil, and grass-fed collagen, with 8 grams of fiber and 7 grams of protein. Highly rated by hundreds of verified purchasers. Great for ketogenic diets and those with insulin resistance.
✓ Features
- Excellent value at ~$1.30/bar
- Grass-fed collagen + MCT oil
- Soy-free, gluten-free, non-GMO
- 3g net carbs — great for keto/diabetes
⚠ Considerations
- Can arrive melted or crumbled for some
- Contains 1g erythritol
- Dairy listed as allergen warning
🌰 Best Nut & Seed BarMunk Pack Keto Nut & Seed Bar
5g Fiber 3g Net Carbs 150 cal No Erythritol Gluten-Free ~$2/bar
A great low-sugar, low-carb snack bar sweetened with all-natural allulose and monk fruit. Main ingredients are whole food nuts and seeds. Comes in 7 varieties including Caramel Sea Salt, Coconut Almond Dark Chocolate, Macadamia White Chocolate, and a variety pack. Over 5,000 positive reviewer ratings for taste and quality.
✓ Features
- No added sugar, 3g net carbs
- No erythritol — easier on the belly
- Soy-free, dairy-free, gluten-free
- Non-GMO, no artificial preservatives
⚠ Considerations
- May contain peanuts/tree nuts for allergens
- Some find it too sweet despite no added sugar
🌱 Best Plant-Based PickALOHA Organic Plant-Based Protein Bars
9–10g Fiber 14g Protein 3g Added Sugar USDA Organic Gluten-Free ~$2.25/bar
Rich in fiber and plant proteins, gluten-free, and Paleo. Peanut Butter Chocolate is the best-rated flavor. Made with organic brown rice protein, organic pumpkin seed protein, and tapioca fiber. A certified B-Corp brand. Excellent for vegans who want both high fiber and high protein. Start with half a bar if you’re new to high-fiber eating.
✓ Features
- Soy-free, gluten-free
- No sugar alcohols or stevia
- Paleo, non-GMO, certified B-Corp
- High fiber + protein in one bar
⚠ Considerations
- Vegan bar — no animal protein
- Very high fiber — start with half
Best Fiber Bars for Kids
Allergen-free, whole-food picks the whole family will enjoy
🍎 Best for KidsThat’s It Natural Fruit Bars
3g Fiber No Added Sugar Nut-Free Dairy-Free Soy-Free ~$1.50/bar
Made purely from whole fruits — that’s it, literally. Naturally gluten-free, free of major allergens, and no added sugars. A healthier snack for kids and adults alike because there’s nothing fake. Available in Blueberry, Cherry, Apple, Fig, Banana, and Strawberry. BPA-free packaging and perfectly portioned for little ones.
✓ Features
- Ingredient list: Fruit (that’s it!)
- Nut-free, dairy-free, soy-free, gluten-free
- No added sugar
- 1,000+ positive reviews
- BPA-free packaging
⚠ Considerations
- No protein — fruit-only bars
- Lower fiber at 3g (still counts for kids!)
🥚 Best Whole Food Kids BarRXBAR
3–5g Fiber 12g Protein No Added Sugar Gluten-Free ~$2/bar
Worth mentioning for its protein fiber combination with a super clean ingredient list: egg whites, dates, almonds, and cashews — that’s essentially it. A lower-fiber option for those who need to go easy on fiber intake. 3–5 grams of fiber and 12 grams of protein per bar. Excellent taste and widely available.
Find on Amazon → Best Fiber Bar Snack Alternative
For those who prefer savory over sweet
🧀 Best Savory AlternativeHighKey Low Carb Cheddar Crackers
8g Fiber 7g Protein 2g Net Carbs Zero Sugar Gluten-Free ~$1.60/serving
For people who prefer savory over sweet, these crackers are a fantastic high-fiber snack that promotes healthy blood sugar levels because of their low carb content. Made with butter, cassava fiber, almond flour, whey protein, and cheddar cheese powder, they have a delicious cheesy flavor and keep you full for a long time. My personal favorite variety is the Cheddar Flavor.
✓ Features
- 8g fiber, 7g protein, only 2g net carb
- Gluten-free, zero sugar
- Prebiotic guar gum included
- Diabetic diet-friendly
- Great reviews for taste — a personal favorite
⚠ Considerations
- Contains almond, milk, and egg allergens
Thank you very much for this informative information as it helped me out alot. Very simple and easy to follow.i appreciate that. Have a great day. Thank you. Tina Hinderer