Product fact sheet
NOW Fibersol-2 Prebiotic Fiber: Resistant Maltodextrin Evidence & Dose
Evidence-aware fact sheet for NOW Prebiotic Fiber with Fibersol-2, including its 12 g resistant maltodextrin dose, stool, microbiota, satiety and low-FODMAP evidence.
A high-dose single-ingredient digestion-resistant maltodextrin powder providing 12 g Fibersol-2 and 11 g soluble fiber per serving. Human trials have examined the same branded ingredient at 5-15 g doses for satiety, microbiota and stool/transit endpoints, giving this product a stronger ingredient-to-retail bridge than generic proprietary fiber blends.
Adults comparing a low-viscosity soluble fiber with human Fibersol-2 data, People who want a prebiotic fiber that NOW identifies as low-FODMAP certified at the ingredient level
Anyone assuming appetite-hormone changes guarantee weight loss, People who need a lower starting fiber load without titration
Key tradeoff: Strong branded-ingredient traceability and multi-endpoint human data, but a 12 g serving is a substantial fiber dose and clinical benefits remain endpoint-specific.
This is a factual fit-and-tradeoff summary, not a product recommendation. Formula, device and brand claims remain manufacturer claims unless the cited source is explicitly regulatory or independent testing.
NOW Prebiotic Fiber with Fibersol-2 is a single-ingredient digestion-resistant maltodextrin powder. The current serving provides 12 g Fibersol-2 and 11 g dietary fiber.
That is a substantial dose, but it is also unusually easy to compare with published research because Fibersol-2 is the same branded ingredient used in several human trials.
What has Fibersol-2 actually been shown to do?
A randomized study in healthy adults tested 7.5 g and 15 g/day resistant maltodextrin. The intervention altered fecal bacterial populations and shifted short-chain-fatty-acid proportions toward butyrate, while gastrointestinal tolerance effects were generally minor.
Other controlled studies have examined digestion-resistant maltodextrin for colonic transit/stool outcomes and Fibersol-2 at 5 and 10 g with a meal for hunger and satiety-related hormones.
That means the current 12 g serving sits in the same broad dose neighborhood as several human studies.
What that does not prove
A lower hunger rating, GLP-1 change or other satiety signal is not the same as demonstrated long-term weight loss. Likewise, a microbiota change does not establish treatment of IBS, diabetes or inflammatory disease.
The product is best viewed as a well-characterized soluble resistant fiber with several human endpoints—not a metabolic drug.
Current label snapshot
| Feature | Specification |
|---|---|
| Substrate | Fibersol-2 digestion-resistant maltodextrin |
| Source | Non-GMO corn |
| Amount | 12 g per 2 tablespoons |
| Dietary fiber | 11 g |
| Other ingredients | None |
| Current use | 2 tablespoons daily mixed with a beverage |
NOW also reports that Fibersol-2 has been assessed as low FODMAP at qualifying serving levels. That is a useful tolerability signal, though individual responses to a large fiber dose can still vary.
Practical comparison
Fibersol-2 is less viscous than psyllium and generally less rapidly fermentable than FOS/inulin. That makes it a useful comparator for people who want a soluble fiber but do poorly with highly fermentable fructans.
The full prebiotic guide compares it with PHGG, XOS, FOS, GOS, acacia, HMOs and resistant starch.
Formula facts
Ingredients, actives and label details
- Prebiotic substrate
- Fibersol-2 digestion-resistant maltodextrin derived from non-GMO corn Basis: Manufacturer Source: NOW Prebiotic Fiber with Fibersol-2 Powder — official product information
- Fiber dose
- 12 g Fibersol-2 per 2 tablespoons, providing 11 g dietary fiber Basis: Manufacturer Source: NOW Prebiotic Fiber with Fibersol-2 Powder — official product information
- Microbiota evidence
- Randomized human work at 7.5 and 15 g/day altered fecal bacterial populations and shifted short-chain fatty-acid proportions toward butyrate Basis: Randomized trial Source: A novel resistant maltodextrin alters gastrointestinal tolerance factors, fecal characteristics, and fecal microbiota in healthy adult humans
- Satiety evidence
- A crossover trial tested 5 and 10 g Fibersol-2 with a meal and found lower hunger and changes in satiety-related hormones Basis: Randomized trial Source: Soluble dietary fiber (Fibersol-2) decreased hunger and increased satiety hormones in humans when ingested with a meal
- FODMAP context
- NOW reports Fibersol-2 is Monash Low FODMAP Certified at qualifying serving levels Basis: Manufacturer Source: NOW Prebiotic Fiber with Fibersol-2 Powder — official product information
Source labels preserve provenance. Manufacturer specifications, ingredient lists and performance claims are not treated as independent clinical evidence; regulatory records and independent measurements are identified separately when available.
Safety first
What should make you slow down?
Use the product as directed, avoid treating concentrated wellness products as automatically harmless, and ask a qualified clinician when your situation or medication use makes the decision less routine.
Where to buy
Current tracked merchants
Commerce note: merchant economics never enter our editorial score. Affiliate links are identified as (paid link) and use sponsored-link markup.
No merchant destination is currently tracked for this product.
Source trail
Primary documents and supporting evidence
- NOW Prebiotic Fiber with Fibersol-2 Powder — official product informationNOW Foods · Manufacturer · retrieved 2026-08-12
- A novel resistant maltodextrin alters gastrointestinal tolerance factors, fecal characteristics, and fecal microbiota in healthy adult humansJournal of the American College of Nutrition · Professional health · retrieved 2026-08-12
- Digestion-resistant maltodextrin effects on colonic transit time and stool weight: a randomized controlled clinical studyEuropean Journal of Nutrition · Professional health · retrieved 2026-08-12
- Soluble dietary fiber (Fibersol-2) decreased hunger and increased satiety hormones in humans when ingested with a mealNutrition Research · Professional health · retrieved 2026-08-12