Top 5 — Ranked by Evidence
Strong
Beta-Glucans (Oat & Yeast-Derived)
Respiratory immune support (yeast β-glucan)
Cholesterol (FDA claim): 3 g/day oat β-glucan. Immune (Wellmune®): 250-500 mg/day yea
Very Strong
Vitamin D
Respiratory infections
RDA: 600-800 IU/day. Optimal serum 25(OH)D: 30-50 ng/mL (typically 1,000-2,000 IU/day
Strong
Zinc Acetate
May Shorten the Common Cold (Cold Lozenges)
13–23 mg elemental zinc per lozenge for cold use (75–100 mg/day total); 50 mg three t
Moderate
Andrographis
Upper respiratory tract infections
Standard URI dose: 200-1,200 mg/day andrographis extract standardized to ≥10% androgr
Moderate
ImmuseLC-Plasma (Lactococcus lactis strain Plasma)
Reduced cold-like symptom days
100 billion (10¹¹) heat-killed L. lactis strain Plasma/day standard RCT dose. Kirin i
📈 Fastest Growing Respiratory Health Ingredients
Branded ingredients seeing rapid growth in formulator adoption and clinical research in 2024–2026.
Trending
Limited
Quercefit® (Quercetin Phytosome — Indena)
Nasal and Eye Allergy Symptoms in One Placebo-Controlled Trial
250 to 500 mg/day, delivering about 100 to 200 mg quercetin, in the allergy, fatigue and…
Trending
Moderate
ParActin® (Andrographis Extract — HP Ingredients)
Immune and respiratory claims come from a two-herb combination
The single ParActin trial used 300 mg or 600 mg a day for 84 days in adults with knee…
Trending
Strong
ThymoQuin® (Black Seed Oil — TriNutra)
Respiratory support applications
500-1,000 mg/day; cardiometabolic protocols 1-2 g/day.
🔬 Future Respiratory Health Ingredients to Watch
Lower current evidence but active research underway — these may become top picks within 2–3 years.
Watch
Moderate
ImmuseLC-Plasma (Lactococcus lactis strain Plasma)
Reduced cold-like symptom days
100 billion (10¹¹) heat-killed cells/day; yogurt 100 billion cells/100 g serving.
Watch
Limited
Lactobacillus paracasei (Multi-Strain Specialist)
Upper respiratory symptom duration
L. casei 431: ≥1×10^9 CFU/day. KW3110 (pollen allergy): 4×10^10 CFU/day. GM-080 (pediatric…
Watch
Limited
Elderberry
Reduced upper respiratory symptoms
Trial dosing varies by product: the 60-patient influenza trial described on this page used…
Recommended Respiratory Health Products
Heads up: NutraSmarts may earn a commission from purchases made through these links, at no extra cost to you. We curate these picks based on the same evidence we cite throughout the page. Full disclosure.
Real products featuring the best-evidenced respiratory health ingredients ranked above - chosen for clinically-studied forms and doses, third-party testing, and value. Match the supplement to your specific need.
Best for immune-supporting vitamin D
Amazon →
Sports Research Vitamin D3 5000 IU with Coconut MCT Oil
5,000 IU (125 mcg) softgels, 360 ct
High-potency D3 blended with coconut MCT oil for absorption, non-GMO verified; a year-plus supply for immune support.
Best for value NAC
Amazon →
NOW NAC 600 mg with Selenium
600 mg veg capsules, 250 ct
Standard 600 mg NAC with selenium and molybdenum cofactors; a glutathione precursor in a large economical bottle.
Best for absorbable quercetin
Amazon →
Thorne Quercetin Phytosome
250 mg quercetin phytosome/capsule, 60 ct
Uses a phytosome complex marketed as far more bioavailable than standard quercetin; popular for seasonal/immune support.
Best for elderberry immune support
Amazon →
Sambucol Black Elderberry Original Formula Syrup
Black elderberry extract syrup, 7.8 fl oz
The original, widely studied black elderberry brand in an easy liquid format; rich in anthocyanin antioxidants.
All Respiratory Health Ingredients (35)
Strong
Beta-Glucans (Oat & Yeast-Derived)
Respiratory immune support (yeast β-glucan)
Cholesterol (FDA claim): 3 g/day oat β-glucan. Immune (Wellmune®): 250-500 mg/day yea
Very Strong
Vitamin D
Respiratory infections
RDA: 600-800 IU/day. Optimal serum 25(OH)D: 30-50 ng/mL (typically 1,000-2,000 IU/day
Strong
Zinc Acetate
May Shorten the Common Cold (Cold Lozenges)
13–23 mg elemental zinc per lozenge for cold use (75–100 mg/day total); 50 mg three t
Moderate
Andrographis
Upper respiratory tract infections
Standard URI dose: 200-1,200 mg/day andrographis extract standardized to ≥10% androgr
Moderate
ImmuseLC-Plasma (Lactococcus lactis strain Plasma)
Reduced cold-like symptom days
100 billion (10¹¹) heat-killed L. lactis strain Plasma/day standard RCT dose. Kirin i
Moderate
Black Seed Oil
Allergic rhinitis and asthma support
Standard cardiometabolic dose: 500-2,000 mg/day cold-pressed black seed oil. Higher-d
Moderate
NAC (N-Acetylcysteine)
Respiratory Health
600–1,800 mg/day in divided doses; respiratory: 600 mg twice daily; liver support: 60
Strong
Menthol
Respiratory symptom relief — sensation, not actual decongestion
IBS (enteric-coated peppermint oil): 180-225 mg L-menthol equivalent 3×/day (IBgard®)
Moderate
Zinc Gluconate
Common Cold Symptom Reduction
15–50 mg elemental zinc/day for general supplementation; for cold treatment 13.3–23 m
Moderate
PROMUNEL® (Propolis Immune Extract)
Respiratory illness recovery about 2 days faster
400–800 mg/day propolis extract; PROMUNEL® clinical dose per PLT specifications; immu
Limited
Elderberry
Reduced upper respiratory symptoms
600–900 mg extract/day during illness; 150–300 mg/day for prevention
Limited
Lactobacillus paracasei (Multi-Strain Specialist)
Upper respiratory symptom duration
L. CASEI 431® RESPIRATORY: ≥1×10⁹ CFU/day × 42 days. KW3110 POLLEN ALLERGY: 4×10¹⁰ CF
Moderate
BLIS K12® (Streptococcus salivarius for ENT — Stratum Nutrition)
Upper-Respiratory Comfort — Trial Reports
1 billion CFU/day BLIS K12 (research-validated)
Moderate
Bromelain
Sinus and respiratory support
200–400 mg/day (500–2,000 GDU) for anti-inflammatory; 400–800 mg/day with meals for d
Moderate
ParActin® (Andrographis Extract — HP Ingredients)
Immune and respiratory claims come from a two-herb combination
50-100 mg/day ParActin® andrographis extract; PPAR-gamma activation, anti-inflammatory
Moderate
Quercetin
Allergy Relief
500-1000 mg/day quercetin; modest URI duration reductions in clinical trials
Limited
Codonopsis pilosula (Dang Shen / Poor Man's Ginseng)
COPD herbal formulae meta-analysis
TCM TYPICAL: 9-15 g/day root decoction. oncology adjunct: oral liquid (approved Chine
Moderate
Codonopsis lanceolata (Deodeok / Korean Bonnet Bellflower)
Traditional pulmonary use
TCM TYPICAL: 9-15 g/day root decoction. SARCOPENIA RCT (Park 2022 protocol): 750 mg w
Limited
Echinacea
Fewer Colds: A Small and Contested Effect
300–500 mg three times daily (900–1,500 mg/day) during illness; prevention: 300 mg/da
Limited
AlvioLife® (Respiratory Health & Performance)
Peak expiratory flow improved in one small asthma trial
Per AlvioLife® clinical dosing; PLT Health Solutions product specifications
Limited
Isenolic® (Olive Polyphenols for Cold/Flu)
Neuraminidase inhibition (anti-influenza mechanism)
Per Pharmactive product specification
Limited
Quercefit® (Quercetin Phytosome — Indena)
Nasal and Eye Allergy Symptoms in One Placebo-Controlled Trial
250-500 mg/day Quercefit (research-validated)
Limited
Thyme (Thymus vulgaris)
Acute Bronchitis Cough Reduction (Thyme-Ivy Combination)
BRONCHIPRET® THYME-IVY: 5.4 mL × 3/day × 11 d. BRONCHIPRET® TP: 1 tablet × 3/day × 11
Strong
ThymoQuin® (Black Seed Oil — TriNutra)
Respiratory support applications
500-1000 mg/day ThymoQuin® black seed oil standardized to ≥3% thymoquinone
Limited
Astragalus (Astragalus membranaceus)
Immune modulation and upper-respiratory support
ROOT: 2-6 g/day dried OR 250-500 mg/day standardized extract. IMMUNE: 500 mg BID. TA-
Limited
Berriqi® (Boysenberry and Apple Polyphenols — Anagenix)
Airway and respiratory support
A daily serving of the standardized polyphenol concentrate.
Limited
CM-Glucan™ Nu
Seasonal immune and upper-respiratory support (reported)
100 mg/day
Limited
Attenutin® (Scutellaria and Acacia for Respiratory Health — Unigen)
Respiratory support
Per the product specification.
Limited
Slippery Elm
Cough/Sore Throat Symptomatic Relief
STANDALONE: 2-4 g powdered inner bark in water 3-4×/day OR 400-500 mg caps 3×/day. LO
Limited
Verilla® (Perilla Extract for Seasonal Allergy)
Nasal and eye comfort
Around 50 to 200 mg of rosmarinic acid per day.
Limited
Rosmarinic Acid
Studied in people with seasonal hay fever
ALLERGIC RHINITIS: 50-200 mg/day Perilla × 21 d. AD COGNITION (Noguchi-Shinohara): 50
Limited
Butterbur (Petasites hybridus)
Allergic rhinitis symptom relief
50–75 mg twice daily PA-free Petadolex® (75–150 mg/day) for migraine prevention; alle
Limited
Tinofend® (Tinospora cordifolia for Immune — Verdure)
Seasonal nasal comfort — what one small trial reported
Per Verdure Tinofend product specification
Moderate
Licorice Root (Glycyrrhiza glabra)
Respiratory and anti-inflammatory effects
DGL for GI: 380–760 mg chewable before meals; whole licorice: 200–600 mg/day (limit t
Preliminary
Eyebright (Euphrasia officinalis)
Upper respiratory mucosal support
Oral: 400–800 mg/day dried herb or standardized extract; ophthalmic solution: 1–2 dro