Top 5 — Ranked by Evidence
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
200-1,200 mg/day of extract standardized to >=10% andrographolides, used short term at cold onset; the clearest trial used 200 mg/day.
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, about 100 to 200 mg quercetin, in the studies; the 1,000 mg/day senolytic…
Trending
Moderate
ParActin® (Andrographis Extract — HP Ingredients)
Immune and respiratory claims come from a two-herb combination
300 mg or 600 mg a day in the single trial; labels often suggest 100-300 mg, whose low end is…
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
Immuse LC-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
The 60-patient influenza trial used liquid extract at 15 mL four times daily; extract…
Recommended Respiratory Health Products
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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 when a blood test shows low vitamin D
Amazon →
Sports Research Vitamin D3 5000 IU with Coconut MCT Oil
5,000 IU (125 mcg) softgels, 360 ct
High-potency D3 in coconut MCT oil for absorption, non-GMO verified. Large trials found vitamin D did not prevent respiratory infections in people who were not deficient, and at 5,000 IU each softgel is above the 4,000 IU daily adult upper limit, so it is for correcting a confirmed deficiency rather than year-round protection.
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 (30)
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
200-1,200 mg/day of extract standardized to >=10% andrographolides, used short term at cold onset; the clearest trial used 200 mg/day.
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
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 three times daily; menthol is only one component of peppermint oil, and no cited trial tested isolated menthol.
Moderate
Zinc Gluconate
Common Cold Symptom Reduction
15 to 30 mg elemental zinc a day generally; 40 mg a day is the adult upper limit. The cold-lozenge regimen reaches roughly 80 to 100 mg a day and exceeds that limit, so use it for a few days only.
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
The 60-patient influenza trial used liquid extract at 15 mL four times daily; extract strengths differ widely between products, and no preventive dose is established in the cited evidence.
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
Black Seed Oil
Allergic rhinitis and asthma support
Standard cardiometabolic dose: 500-2,000 mg/day cold-pressed black seed oil. Higher-d
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
300 mg or 600 mg a day in the single trial; labels often suggest 100-300 mg, whose low end is below the amounts tested.
Moderate
Quercetin
Allergy Relief
500-1,000 mg/day; in pooled blood pressure trials 500 mg/day or more worked while doses below 500 mg/day did nothing, and many products supply well under 500 mg.
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
Limited
Echinacea
Fewer Colds: A Small and Contested Effect
Prevention: 2,400 mg/day of an Echinacea purpurea alcoholic extract in adults, 1,200 mg/day in children; treatment used about 10 g of dried root on day 1 then 5 g/day.
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 to 500 mg/day, about 100 to 200 mg quercetin, in the studies; the 1,000 mg/day senolytic figure comes from trials pairing quercetin with a prescription drug, not tested for this product.
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
Berriqi® (Boysenberry and Apple Polyphenols — Anagenix)
Airway and respiratory support
No standard human dose has been established; the one human trial gave capsules daily for 5 days before ozone exposure. Products vary widely in content, so check the label.
Limited
CM-Glucan™ Nu
Seasonal immune and upper-respiratory support (reported)
100 mg/day
Limited
Slippery Elm
Cough/Sore Throat Symptomatic Relief
No trial has tested slippery elm alone; traditional oral use is 2 to 4 g powdered inner bark in water 3 to 4 times daily, or 400 to 500 mg capsules 3 times daily.
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
One hay fever trial used a Perilla frutescens extract supplying 50 mg or 200 mg of rosmarinic acid a day for 21 days; doses for cognition or anxiety are not established here.
Limited
Butterbur (Petasites hybridus)
Allergic rhinitis symptom relief
Migraine trial: 2 capsules of 25 mg twice daily of a PA-free standardized extract; market doses and extract strengths vary widely.
Limited
Tinofend® (Tinospora cordifolia for Immune — Verdure)
Seasonal nasal comfort — what one small trial reported
Per Verdure Tinofend product specification
Limited
Licorice Root (Glycyrrhiza glabra)
Respiratory and anti-inflammatory effects
75 mg twice daily of a deglycyrrhizinated extract in the dyspepsia trial. The EU advises no more than 100 mg glycyrrhizin a day.
Preliminary
Eyebright (Euphrasia officinalis)
Upper respiratory mucosal support
Traditional amounts only: 400-800 mg/day dried herb or extract, or a tea from 1-2 g dried herb, 2-3 cups/day. No controlled trial has tested any oral dose of eyebright.