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Top 5 Fiber Supplements of 2025
Which fiber supplements help regulate digestive health and boost energy? Plus, top ingredients to look for + avoid.
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As you may already be aware, fiber is a big part of maintaining optimal
As you may know, fiber plays a crucial role in maintaining optimal health—yet FDA date shows that a whopping 92% of American adults fall short of the daily recommended intake.¹
Low fiber can lead to issues like constipation, bloating, low energy, heart health concerns, and weight management challenges.²
This is especially relevant for those taking GLP-1 medications, which often slow digestion and contribute to occasional constipation. The right fiber supplement can help support regularity and ease discomfort.
But not all fiber supplements are created equal. With so many options out there, it’s hard to know what works.
That’s why Smarter Reviews analyzed hundreds of products to bring you the top 5 supplements that actually deliver results.
Why is Fiber So Important?
Fiber not only supports proper digestion, nutrient absorption, and healthy bowel movements, it also helps:
♦ Promote a healthy weight
♦ Support normal energy and stamina
♦ Maintain healthy cholesterol levels
♦ Support healthy blood sugar levels
♦ May help promote body’s natural GLP-1 production
When looking for a fiber supplement, many people look for any supplement that contains fiber. What they might not to know is that there are different types of fiber, each serving a different purpose.
The main types of fiber are soluble and insoluble fiber. Soluble fiber helps support healthy weight management by making you feel full longer. They're also shown to help maintain healthy blood sugar and cholesterol.
Insoluble fiber helps food pass more quickly through the stomach and intestines. This can guard against constipation and alleviate other digestive issues.
To reap the full benefits of fiber, you'll need a blend of both types.
Other Ingredients To Look For
Prebiotic Fiber = Health Powerhouse
Recent findings have revealed the true key to digestive comfort: healthy gut bacteria. We’ve also learned that fiber doesn’t just support digestion — it actively feeds and fuels these vital organisms. That means combining different forms of fiber, especially those with prebiotic benefits, can lead to powerful, long-lasting support.
So, it’s important to find a formula that delivers this targeted combination — especially if you want to enjoy smoother digestion, fewer cravings for “junk food,” and more sustained energy throughout the day.
Avoid Artificial Sweeteners & Flavors
Many brands add artificial flavors and sweeteners to enhance the taste of their powders. Make sure any added sweetener is naturally-sourced (such as stevia or erythritol), since synthetic sugar could cause unnecessary weight gain, and other undesirable side effects in some people.
Why You Need Fiber When Taking GLP-1s
GLP-1 medications can help with weight loss and blood sugar but often cause constipation by slowing digestion. A quality fiber supplement can help restore regularity.
Fiber adds bulk to stool and supports gut bacteria—key for smoother digestion and easing GLP-1 side effects.
Whether you're already dealing with this or want to stay ahead of it, fiber is a simple, effective way to stay regular and comfortable.
When it comes to choosing an effective fiber supplement, quality ingredients are the most important thing — but they're not the only thing. Here are a few points to consider before making your purchase.
Check For The Following Before You Buy
Non-GMO
Non-GMO ingredients are grown without pesticides or other unnecessary toxins that can contaminate what you're consuming.
Doctor-Formulated
Fiber supplements can guarantee more effectiveness and safety when formulated by a specialized doctor who has years of experience in that specialty.
Money-Back Guarantee
It’s always a good idea to invest in a supplement that offers a 100% satisfaction money-back guarantee that shows the company's faith in its product. Look for brands that offer at least a 90-day money-back guarantee.
Top 5 Fiber Supplements of 2025
After analyzing the top-selling fiber supplements across multiple metrics, this list has been narrowed down to include only the best of the best. Check out the top 5 picks below.
1. FiberFitMD™
Owned by the Smarter Reviews Group of Companies
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9.
A+
Overall Grade
PROS
- Gastroenterologist-formulated
- Contains 10g of essential dietary per serving
- Prebiotics Included
- Vegan & non-GMO
- Soluble & Insoluble Fiber
- Heart & Gut Support
- Unflavored Powder
- No Sugar or Dairy
- 90-day money-back guarantee
CONS
- Only sold online
The Bottom Line
FiberFitMD™ delivers a clinically formulated blend of Inavea™ organic acacia and psyllium seed husk, offering a powerful source of both soluble and insoluble fiber to support digestive regularity, heart health, and overall wellness. *
This formula includes prebiotic fiber to nourish beneficial gut bacteria and promote a balanced microbiome — which helps maximize the effectiveness of your daily fiber intake.*
It’s unflavored, vegan, non-GMO, and free from sugar, dairy, wheat, shellfish, and peanuts, making it an easy addition to almost any routine.
With doctor formulation, strong clinical ingredients, and a 90-day money-back guarantee, FiberFitMD™ stands out as a comprehensive and reliable solution for those looking to close the fiber gap and elevate their digestive and metabolic health.*
*Results do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.
Learn More2. Thorne FiberMend
Total Ranking
9.5/10
A
Overall Grade
PROS
- 7g soluble fiber
- Prebiotic blend
- No Sweeteners or Flavors
- Gentle on digestion
- Gluten & Dairy Free
- Supports Blood Sugar
- 3rd Party Tested
- 30-day supply
CONS
- Pricier than some brands
- 60-day return policy
The Bottom Line
Thorne’s FiberMend® earns a solid second place for its clean, plant-based blend of soluble fibers like Sunfiber®, rice bran, apple pectin, and arabinogalactan, which support digestive health and prebiotic activity without causing bloating or gas.*
It’s flavorless, unsweetened, and free from gluten, dairy, and soy, making it easy to add to any beverage or meal without altering taste or texture. Third-party testing also adds an extra layer of trust in product quality.
However, FiberMend® falls short of the top spot due to its limited 60-day return policy, especially when compared to the 90-day guarantee offered by top competitors. Still, it’s a strong contender for anyone seeking simple, effective daily fiber support.*
*Results do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.
Learn More3. 1st Phorm Multi-Fiber
Total Ranking
8.7/10
B+
Overall Grade
PROS
- 9g of fiber per scoop
- Includes psyllium, inulin & corn fiber
- Supports digestion & regularity
- Helps manage hunger & cravings
- Multiple flavor options
- Mixes easily with water or shakes
- 30-day return policy
CONS
- No beetroot
- No additional vitamins
The Bottom Line
1st Phorm’s Multi-Fiber secures third place with a high 9g fiber content per scoop, combining psyllium husk, inulin, and soluble corn fiber to support digestive health, regularity, and reduced cravings.*
It stands out with flavored options like Mango Pineapple and mixes easily into shakes or water — a plus for users who want a tastier experience. The formula is also vegan-friendly and designed to complement an active lifestyle.
However, it’s held back by a short 30-day return policy and the inclusion of stevia and monk fruit, which may not suit all preferences. Despite those drawbacks, it’s a good option for those seeking a flavorful, fiber-rich supplement — just with less flexibility and added sweeteners.*
*Results do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.
Learn More4. Metamucil Premium Blend
Total Ranking
8.7/10
B+
Overall Grade
PROS
- 5g fiber per serving
- Plant-based psyllium husk
- Supports heart & digestive health
- Helps control appetite
- No artificial flavors or colors
CONS
- Contains maltodextrin
- Contains sugar substitute, stevia
- No money-back guarantee
The Bottom Line
Metamucil Premium Blend is a well-known legacy brand that delivers 5g of fiber per serving from plant-based psyllium husk, supporting heart health, digestive regularity, and appetite control.*
The Premium Blend is sweetened with stevia, contains no artificial colors or flavors, and is widely available in retail stores — making it one of the most accessible options on the market.
However, the formula includes maltodextrin and may cause initial bloating, especially for new users. It also lacks a money-back guarantee, which puts it behind more flexible, customer-focused options.
While it's a familiar name with strong brand trust, Metamucil doesn’t quite measure up to newer, more comprehensive fiber formulas that offer broader benefits, better return policies, and cleaner ingredient profiles.*
*Results do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.
Learn More5. Benefiber Daily Prebiotic
Total Ranking
7.9/10
C+
Overall Grade
PROS
- 3g fiber per serving (3 caplets)
- Prebiotic fiber (wheat dextrin)
- Supports digestive health
- Travel-friendly
- Sugar-free
- Gluten-free
- No artificial flavors or sweeteners
CONS
- Lower fiber per serving
- Requires multiple capsules
- Large capsules
- Not suitable for those with wheat allergies
- No money-back guarantee
The Bottom Line
Benefiber Prebiotic Fiber Caplets provide a simple, travel-friendly option for daily fiber, delivering 3g of wheat dextrin per 3-caplet serving to support digestive health and prebiotic benefits.*
The caplet format is convenient for those who don’t want to mix powders, and the formula is sugar-free, gluten-free, and free from artificial flavors.
However, Benefiber comes with trade-offs: it offers a lower fiber dose, requires multiple caplets per serving, and is not suitable for individuals with wheat sensitivities.
Most notably, there is no clear money-back guarantee, which may be a concern for first-time users.
Overall, while it’s widely available and easy to use, Benefiber lacks the strength, flexibility, and customer assurance found in top-tier fiber supplements.*
*Results do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.
Learn MoreDisclaimer:
Smarter Reviews is owned and operated by the same company that owns certain products featured on this website, including the products ranked number one.
In addition, we receive compensation from certain companies whose products are featured on this website when you purchase a product using the links on this website.
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Sources used for research purposes. Smarter-Reviews.com are not officially affiliated with these sites.
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