Source Naturals FOS, 1000 mg supplement bottle
Source Naturals

FOS, 1000 mg Review

What We Researched
5 active ingredients analyzed · 4 inactive ingredients decoded · 2 brand certifications checked · Last updated: Aug 2026
93
Product Score Excellent
75
Brand Score Fair

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Total Carbohydrates 4 g 1%
Fructooligosaccharides (FOS) 4 g *
Bioavailability Very Good

Absorption Rating

  • Total Carbohydrates Fair
  • Fructooligosaccharides (FOS) Good
Other Ingredients Excellent

Fillers & Additives

  • Stearic Acid
  • Modified Cellulose Gum
  • Colloidal Silicon Dioxide
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • Fructooligosaccharides (FOS) 4 g Effective

Supplement Facts

Ingredient Amount % Daily Value
Calories 10
Total Carbohydrates 4 g 1%
Dietary Fiber 4 g 16%
Sodium 25 mg 1%
Fructooligosaccharides (FOS) 4 g *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Modified Cellulose Gum Generally_safe

It is used to improve the texture and stability of products.

Colloidal Silicon Dioxide Generally_safe

It prevents clumping and improves powder flow.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Brand Trust Report
Source Naturals

Founded 1982 · Scotts Valley, CA, USA · 1511 products · sourcenaturals.com/

Certifications

2 certifications
Fda Gmp Inspections Verified Source
Non-GMO Project Verified Verified

Transparency

3 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source
Contains Proprietary Blend — True
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Frequently Asked Questions
Is Source Naturals FOS, 1000 mg a good supplement?

Source Naturals FOS, 1000 mg received a product quality score of 93/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 5 active ingredients with 66 servings per container. Of the 4 inactive ingredients, 2 are rated safe and 0 are flagged for review. The manufacturer, Source Naturals, holds a brand trust score of 75/100 with 2 verified certifications including Fda Gmp Inspections, Non-GMO Project Verified.

What are the ingredients in Source Naturals FOS, 1000 mg?

Source Naturals FOS, 1000 mg contains 5 active ingredients: Calories (10), Total Carbohydrates (4 g), Dietary Fiber (4 g), Sodium (25 mg), Fructooligosaccharides (FOS) (4 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals FOS, 1000 mg safe to take?

Source Naturals FOS, 1000 mg 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 Source Naturals a trustworthy supplement brand?

Source Naturals receives a brand trust score of 75/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1982 and headquartered in Scotts Valley, CA, USA, the company offers 1511 products in their lineup. They hold 2 verified certifications including Fda Gmp Inspections, Non-GMO Project Verified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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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 — read our methodology. 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.