Thorne FiberMend® Prebiotic, 11.6 oz (330 g) supplement bottle
Thorne

FiberMend® Prebiotic, 11.6 oz (330 g)

What We Researched
10 active ingredients analyzed · 4 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
61
Product Score Fair
90
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Partially Hydrolyzed Guar Gum† 8 g **
Rice Bran 2.5 g **
Arabinogalactan (from Larch) (Larix spp.)†† 300 mg **
Pectin (from Apple) 150 mg **
Green Tea Phytosome†††(Camellia sinensis extract (leaf) decaffeinated / Phospholipid complex from Sunflower) 50 mg **
Bioavailability Very Good

Absorption Rating

  • Partially Hydrolyzed Guar Gum† Good
  • Rice Bran Fair
  • Arabinogalactan (from Larch) (Larix spp.)†† Good
  • Pectin (from Apple) Fair
  • Green Tea Phytosome†††(Camellia sinensis extract (leaf) decaffeinated / Phospholipid complex from Sunflower) Good
Other Ingredients Fair

Fillers & Additives

No inactive ingredient data available.

Efficacy Very Poor

Dosage Analysis

  • Partially Hydrolyzed Guar Gum† 8 g High
  • Rice Bran 2.5 g Under-dosed
  • Arabinogalactan (from Larch) (Larix spp.)†† 300 mg Under-dosed
  • Pectin (from Apple) 150 mg Under-dosed
  • Green Tea Phytosome†††(Camellia sinensis extract (leaf) decaffeinated / Phospholipid complex from Sunflower) 50 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calories 45
Total Fat 1 g 1%*
Total Carbohydrate 9 g 3%*
Dietary Fiber 7 g 25%*
Soluble Fiber 6 g **
Partially Hydrolyzed Guar Gum† 8 g **
Rice Bran 2.5 g **
Arabinogalactan (from Larch) (Larix spp.)†† 300 mg **
Pectin (from Apple) 150 mg **
Green Tea Phytosome†††(Camellia sinensis extract (leaf) decaffeinated / Phospholipid complex from Sunflower) 50 mg **

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$47$46$45$44$43 Mar 12 $45.00
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Thorne

Founded 1984 · New York, NY, United States · 161 products · thorne.com

Certifications

4 certifications
Consumerlab Verified
Nsf Certified For Sport Verified Source
Nsf Gmp Verified Source
Fda Gmp Inspections Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

2 incidents
Recall Captomer, Captomer-2502014-06-12Source
Prop 65 Lead2013-12-13Source
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Frequently Asked Questions
Is Thorne FiberMend® Prebiotic, 11.6 oz (330 g) a good supplement?

Thorne FiberMend® Prebiotic, 11.6 oz (330 g) received a product quality score of 61/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 10 active ingredients with 30 servings per container. The manufacturer, Thorne, holds a brand trust score of 90/100 with 4 verified certifications including Consumerlab, Nsf Certified For Sport, Nsf Gmp, Fda Gmp Inspections.

What are the ingredients in Thorne FiberMend® Prebiotic, 11.6 oz (330 g)?

Thorne FiberMend® Prebiotic, 11.6 oz (330 g) contains 10 active ingredients: Calories (45), Total Fat (1 g), Total Carbohydrate (9 g), Dietary Fiber (7 g), Soluble Fiber (6 g), Partially Hydrolyzed Guar Gum† (8 g), and 4 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Thorne FiberMend® Prebiotic, 11.6 oz (330 g) safe to take?

Thorne FiberMend® Prebiotic, 11.6 oz (330 g) has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Thorne a trustworthy supplement brand?

Thorne receives a brand trust score of 90/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1984 and headquartered in New York, NY, United States, the company offers 161 products in their lineup. They hold 4 verified certifications including Consumerlab, Nsf Certified For Sport, Nsf Gmp, Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Thorne has 2 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.