Nature's Secret Respiratory Support & Defense, 60 Tablets supplement bottle
Nature's Secret

Respiratory Support & Defense, 60 Tablets

What We Researched
16 active ingredients analyzed · 13 inactive ingredients decoded · 2 retailers compared · Last updated: Mar 2026
70
Product Score Fair
71
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Total Carbohydrates 1 g <1%**
Calcium 115 mg 9%
N-Acetyl-L-Cysteine (NAC) 300 mg
Proprietary BlendLicorice (Glycyrrhiza glabra) powder (root), Alfalfa powder (aerial), Cayenne extract (30,000 HU) (fruit), BioPerine®Black Pepper extract (50:1) (fruit) 102 mg
Fenugreek powder (seed) 100 mg
Marshmallow extract (4:1) (root) 100 mg
Mullein (Verbascum thapsus) powder (leaf) 100 mg
Skullcap powder (whole herb) 80 mg
Watercress powder (aerial) 50 mg
Para Aminobenzoic Acid (PABA) 36 mg
Garlic powder (bulb) 30 mg
Onion powder (bulb) 30 mg
Pleurisy powder (root) 30 mg
Turnip powder (root) 30 mg
Thyme powder (leaf) 10 mg
Bioavailability Good

Absorption Rating

  • Total Carbohydrates Fair
  • Calcium Good
  • N-Acetyl-L-Cysteine (NAC) Good
  • Proprietary BlendLicorice (Glycyrrhiza glabra) powder (root), Alfalfa powder (aerial), Cayenne extract (30,000 HU) (fruit), BioPerine®Black Pepper extract (50:1) (fruit) Fair
  • Fenugreek powder (seed) Fair
  • Marshmallow extract (4:1) (root) Good
  • Mullein (Verbascum thapsus) powder (leaf) Fair
  • Skullcap powder (whole herb) Poor
  • Watercress powder (aerial) Fair
  • Para Aminobenzoic Acid (PABA) Good
  • Garlic powder (bulb) Fair
  • Onion powder (bulb) Fair
  • Pleurisy powder (root) Fair
  • Turnip powder (root) Fair
  • Thyme powder (leaf) Fair
Other Ingredients Excellent

Fillers & Additives

  • Calcium Carbonate
  • Microcrystalline Cellulose
  • Dicalcium Phosphate
  • Stearic Acid
  • Magnesium Stearate
  • Silicon Dioxide
  • Gum Arabic
  • Croscarmellose Sodium
  • Sodium Carboxymethylcellulose
  • Dextrose
  • Soy Lecithin
  • Sodium Citrate
  • Dextrin
Efficacy Poor

Dosage Analysis

  • Calcium 115 mg Under-dosed
  • N-Acetyl-L-Cysteine (NAC) 300 mg Under-dosed
  • Fenugreek powder (seed) 100 mg Under-dosed
  • Marshmallow extract (4:1) (root) 100 mg Under-dosed
  • Mullein (Verbascum thapsus) powder (leaf) 100 mg Under-dosed
  • Skullcap powder (whole herb) 80 mg Under-dosed
  • Watercress powder (aerial) 50 mg Under-dosed
  • Para Aminobenzoic Acid (PABA) 36 mg Under-dosed
  • Garlic powder (bulb) 30 mg Under-dosed
  • Onion powder (bulb) 30 mg Effective
  • Pleurisy powder (root) 30 mg Effective
  • Turnip powder (root) 30 mg Effective
  • Thyme powder (leaf) 10 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calories 5
Total Carbohydrates 1 g <1%**
Calcium 115 mg 9%
N-Acetyl-L-Cysteine (NAC) 300 mg
Proprietary BlendLicorice (Glycyrrhiza glabra) powder (root), Alfalfa powder (aerial), Cayenne extract (30,000 HU) (fruit), BioPerine®Black Pepper extract (50:1) (fruit) 102 mg
Fenugreek powder (seed) 100 mg
Marshmallow extract (4:1) (root) 100 mg
Mullein (Verbascum thapsus) powder (leaf) 100 mg
Skullcap powder (whole herb) 80 mg
Watercress powder (aerial) 50 mg
Para Aminobenzoic Acid (PABA) 36 mg
Garlic powder (bulb) 30 mg
Onion powder (bulb) 30 mg
Pleurisy powder (root) 30 mg
Turnip powder (root) 30 mg
Thyme powder (leaf) 10 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Calcium Carbonate Safe

Acts as a filler and provides supplemental calcium.

Microcrystalline Cellulose Safe

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

Dicalcium Phosphate Safe

Serves as both a filler and a supplemental source of calcium and phosphorus.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Gum Arabic Safe

It is used as a thickener, binder, or emulsifier.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Sodium Carboxymethylcellulose Generally_safe

It is used as a thickener, binder, or stabilizer.

Dextrose Generally_safe

It is used as a filler, sweetener, or to improve the flow of powders.

Soy Lecithin Safe

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

Sodium Citrate Safe

Stabilizes pH and helps maintain ingredient effectiveness.

Dextrin Generally_safe

It is used as a filler, binder, or coating agent.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$18$17$16$15$14 Mar 12 $16.00
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
Nature's Secret

Founded 1994 · Culver City, CA, USA · 13 products · irwinnaturals.com/collections/natures-secret

Transparency

3 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source

Violation History

4 incidents
Lawsuit Deceptive marketing of products as 'natural' when they contain synthetic ingredients.2021Source
Fda Warning Unregistered food supplement2020-01-28Source
Lawsuit Misleading claims about the brain function benefits of 'Ginkgo Smart'.2020Source
Prop 65 Lead2011-02-01Source
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Frequently Asked Questions
Is Nature's Secret Respiratory Support & Defense, 60 Tablets a good supplement?

Nature's Secret Respiratory Support & Defense, 60 Tablets received a product quality score of 70/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 16 active ingredients with 30 servings per container. Of the 13 inactive ingredients, 10 are rated safe and 0 are flagged for review. The manufacturer, Nature's Secret, holds a brand trust score of 71/100.

What are the ingredients in Nature's Secret Respiratory Support & Defense, 60 Tablets?

Nature's Secret Respiratory Support & Defense, 60 Tablets contains 16 active ingredients: Calories (5), Total Carbohydrates (1 g), Calcium (115 mg), N-Acetyl-L-Cysteine (NAC) (300 mg), Proprietary BlendLicorice (Glycyrrhiza glabra) powder (root), Alfalfa powder (aerial), Cayenne extract (30,000 HU) (fruit), BioPerine®Black Pepper extract (50:1) (fruit) (102 mg), Fenugreek powder (seed) (100 mg), and 10 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Nature's Secret Respiratory Support & Defense, 60 Tablets safe to take?

Nature's Secret Respiratory Support & Defense, 60 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 Nature's Secret a trustworthy supplement brand?

Nature's Secret receives a brand trust score of 71/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1994 and headquartered in Culver City, CA, USA, the company offers 13 products in their lineup. Note: Nature's Secret has 4 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.