Natural Factors Lung, Bronchial & Sinus Health, 90 Tablets supplement bottle
Natural Factors

Lung, Bronchial & Sinus Health, 90 Tablets

What We Researched
8 active ingredients analyzed · 4 inactive ingredients decoded · 5 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
67
Product Score Fair
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
N-Acetyl-L-Cysteine 200 mg **
Bromelain (from Ananas comosus) (pineapple stem) 1000 GDU/g 100 mg **
Marshmallow Extract 4:1 (Althaea officinalis) (root) 100 mg **
Mullein Extract 4:1 (Verbascum thapsus) (leaf) 100 mg **
Wild Cherry Extract 4:1(Prunus serotina) (bark) 100 mg **
Horehound Extract 4:1 (Marrubium vulgare) (herb) 50 mg **
Ivy Extract (Hedera helix) (leaf) 50 mg **
Hederocoside C (10%) 5 mg **
Bioavailability Good

Absorption Rating

  • N-Acetyl-L-Cysteine Good
  • Bromelain (from Ananas comosus) (pineapple stem) 1000 GDU/g Good
  • Marshmallow Extract 4:1 (Althaea officinalis) (root) Good
  • Mullein Extract 4:1 (Verbascum thapsus) (leaf) Fair
  • Wild Cherry Extract 4:1(Prunus serotina) (bark) Poor
  • Horehound Extract 4:1 (Marrubium vulgare) (herb) Fair
  • Ivy Extract (Hedera helix) (leaf) Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Croscarmellose Sodium
  • Coating (Carbohydrate Gum [Cellulose], Glycerin)
  • Magnesium Stearate (Vegetable Grade)
Efficacy Very Poor

Dosage Analysis

  • N-Acetyl-L-Cysteine 200 mg Under-dosed
  • Bromelain (from Ananas comosus) (pineapple stem) 1000 GDU/g 100 mg Under-dosed
  • Marshmallow Extract 4:1 (Althaea officinalis) (root) 100 mg Under-dosed
  • Mullein Extract 4:1 (Verbascum thapsus) (leaf) 100 mg Under-dosed
  • Horehound Extract 4:1 (Marrubium vulgare) (herb) 50 mg Under-dosed
  • Ivy Extract (Hedera helix) (leaf) 50 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
N-Acetyl-L-Cysteine 200 mg **
Bromelain (from Ananas comosus) (pineapple stem) 1000 GDU/g 100 mg **
Marshmallow Extract 4:1 (Althaea officinalis) (root) 100 mg **
Mullein Extract 4:1 (Verbascum thapsus) (leaf) 100 mg **
Wild Cherry Extract 4:1(Prunus serotina) (bark) 100 mg **
Horehound Extract 4:1 (Marrubium vulgare) (herb) 50 mg **
Ivy Extract (Hedera helix) (leaf) 50 mg **
Hederocoside C (10%) 5 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Coating (Carbohydrate Gum [Cellulose], Glycerin) Generally_safe

It is used to protect the supplement ingredients and improve swallowability.

Magnesium Stearate (Vegetable Grade) Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$22$21$20$19$18 Mar 12 $19.57
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
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 Lung, Bronchial & Sinus Health a good supplement?

Natural Factors Lung, Bronchial & Sinus Health, 90 Tablets received a product quality score of 67/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 8 active ingredients Of the 4 inactive ingredients, 2 are rated safe and 0 are flagged for review. 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 Lung, Bronchial & Sinus Health?

Natural Factors Lung, Bronchial & Sinus Health contains 8 active ingredients: N-Acetyl-L-Cysteine (200 mg), Bromelain (from Ananas comosus) (pineapple stem) 1000 GDU/g (100 mg), Marshmallow Extract 4:1 (Althaea officinalis) (root) (100 mg), Mullein Extract 4:1 (Verbascum thapsus) (leaf) (100 mg), Wild Cherry Extract 4:1(Prunus serotina) (bark) (100 mg), Horehound Extract 4:1 (Marrubium vulgare) (herb) (50 mg), and 2 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natural Factors Lung, Bronchial & Sinus Health safe to take?

Natural Factors Lung, Bronchial & Sinus Health, 90 Tablets 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 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.