Natural Factors Stress B Formula Plus 1000 mg C supplement bottle
Natural Factors

Stress B Formula Plus 1000 mg C

What We Researched
12 active ingredients analyzed · 3 inactive ingredients decoded · 5 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
84
Product Score Good
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin C (as Ascorbic Acid) 1000 mg 1667%
Thiamine (as Thiamine Hydrochloride) 25 mg 1667%
Riboflavin 25 mg 1470%
Niacin (as Niacinamide) 25 mg 125%
Vitamin B6 (as Pyridoxine Hydrochloride) 25 mg 1250%
Folic Acid 1000 mcg 250%
Vitamin B12 (as Cyanocobalamin) 25 mcg 417%
Biotin 25 mcg 8%
Pantothenic Acid (as Calcium Pantothenate) 25 mg 250%
Choline (as Choline Bitartrate) 25 mg
Inositol 25 mg
Para-Aminobenzoic Acid 25 mg
Bioavailability Good

Absorption Rating

  • Vitamin C (as Ascorbic Acid) Fair
  • Thiamine (as Thiamine Hydrochloride) Fair
  • Riboflavin Good
  • Niacin (as Niacinamide) Good
  • Vitamin B6 (as Pyridoxine Hydrochloride) Fair
  • Folic Acid Fair
  • Vitamin B12 (as Cyanocobalamin) Fair
  • Biotin Good
  • Pantothenic Acid (as Calcium Pantothenate) Good
  • Choline (as Choline Bitartrate) Poor
  • Inositol Good
  • Para-Aminobenzoic Acid Good
Other Ingredients Excellent

Fillers & Additives

  • Croscarmellose Sodium
  • Magnesium Stearate
  • Soy Lecithin
Efficacy Good

Dosage Analysis

  • Vitamin C (as Ascorbic Acid) 1000 mg Effective
  • Thiamine (as Thiamine Hydrochloride) 25 mg Effective
  • Riboflavin 25 mg Effective
  • Niacin (as Niacinamide) 25 mg Effective
  • Vitamin B6 (as Pyridoxine Hydrochloride) 25 mg Effective
  • Folic Acid 1000 mcg Effective
  • Vitamin B12 (as Cyanocobalamin) 25 mcg Effective
  • Biotin 25 mcg Under-dosed
  • Pantothenic Acid (as Calcium Pantothenate) 25 mg Effective
  • Choline (as Choline Bitartrate) 25 mg Under-dosed
  • Inositol 25 mg Under-dosed
  • Para-Aminobenzoic Acid 25 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin C (as Ascorbic Acid) 1000 mg 1667%
Thiamine (as Thiamine Hydrochloride) 25 mg 1667%
Riboflavin 25 mg 1470%
Niacin (as Niacinamide) 25 mg 125%
Vitamin B6 (as Pyridoxine Hydrochloride) 25 mg 1250%
Folic Acid 1000 mcg 250%
Vitamin B12 (as Cyanocobalamin) 25 mcg 417%
Biotin 25 mcg 8%
Pantothenic Acid (as Calcium Pantothenate) 25 mg 250%
Choline (as Choline Bitartrate) 25 mg
Inositol 25 mg
Para-Aminobenzoic Acid 25 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Soy Lecithin Safe

Helps blend oil and water-based ingredients. Common allergen.

Price Comparison

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

Brand Trust Report
Natural Factors

Founded 1950 · Coquitlam, British Columbia, Canada · 390 products · naturalfactors.com

Certifications

5 certifications
B Corp Certified Verified Source
Usp Verified Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source

Transparency

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

Violation History

5 incidents
Prop 65 Lead2025-10-31Source
Recall Hi Potency B Complex, RevitalX, Super Multi® IRON FREE2024-07-19Source
Lawsuit Products labeled as containing glucosamine sulfate did not contain the ingredient.2021Source
Prop 65 Lead2016-01-13Source
Recall Natural Factors L-Arginine 500mg2006-04-05Source
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Frequently Asked Questions
Is Natural Factors Stress B Formula Plus 1000 mg C a good supplement?

Natural Factors Stress B Formula Plus 1000 mg C received a product quality score of 84/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 12 active ingredients All 3 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Natural Factors, holds a brand trust score of 88/100 with 5 verified certifications including B Corp Certified, Usp Verified, Fda Gmp Inspections, Non Gmo Project.

What are the ingredients in Natural Factors Stress B Formula Plus 1000 mg C?

Natural Factors Stress B Formula Plus 1000 mg C contains 12 active ingredients: Vitamin C (as Ascorbic Acid) (1000 mg), Thiamine (as Thiamine Hydrochloride) (25 mg), Riboflavin (25 mg), Niacin (as Niacinamide) (25 mg), Vitamin B6 (as Pyridoxine Hydrochloride) (25 mg), Folic Acid (1000 mcg), and 6 more. Notable high-dose ingredients include Vitamin C at 1667% DV, Thiamine at 1667% DV, Riboflavin at 1470% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natural Factors Stress B Formula Plus 1000 mg C safe to take?

Natural Factors Stress B Formula Plus 1000 mg C has been analyzed for ingredient safety across all its components. All 3 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Natural Factors a trustworthy supplement brand?

Natural Factors receives a brand trust score of 88/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1950 and headquartered in Coquitlam, British Columbia, Canada, the company offers 390 products in their lineup. They hold 5 verified certifications including B Corp Certified, Usp Verified, Fda Gmp Inspections, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Natural Factors has 5 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.