Grade: A (Strong Scientific Evidence)
Therapy	Specific therapeutic Use(s)
Andrographis paniculata Nees, Kan Jang®, SHA-10	Upper respiratory tract infection: treatment
Grade: B (Good Scientific Evidence)
Therapy	Specific therapeutic Use(s)
Borage seed oil	Acute respiratory distress syndrome
Echinacea	Prevention of upper respiratory tract infections (adults and children)
Elderberry and elder flower	Influenza
Sage	Acute pharyngitis
Vitamin C	Common cold prevention (extreme environments)
Grade: C (Unclear or Conflicting Scientific Evidence)
Therapy	Specific therapeutic Use(s)
Andrographis paniculata Nees, Kan Jang®, SHA-10	Influenza (flu)
Arginine	Respiratory infections
Astragalus	Upper respiratory tract infection
Boneset	Colds/flu
Bovine colostrum	Sore throat
Chamomile	Common cold
Cordyceps	Bronchitis
Elderberry and elder flower	Bronchitis
Euphorbia	Chronic bronchitis
Evening primrose oil	Bronchitis
Gamma linolenic acid	Acute respiratory distress syndrome (ARDS)
Garlic	Upper respiratory tract infection
Goldenseal	Common cold / upper respiratory tract infection
Horseradish	Bronchitis
Kiwi	Respiratory problems (prevention)
L-Carnitine	Respiratory distress (adults)
Licorice	Upper respiratory tract infections (common cold)
Mistletoe	Respiratory disease (recurrent)
Peppermint	Nasal congestion
Propolis	Colds (prevention and treatment)
Selenium	Bronchitis
Slippery elm	Sore throat
Sorrel	Bronchitis
Thyme	Bronchitis / cough
Thymus extract	Respiratory tract infections
Vitamin E	Respiratory infection prevention
Wild indigo	Respiratory tract infections
Zinc	Common cold
Grade: D (Fair Negative Scientific Evidence)
Therapy	Specific therapeutic Use(s)
Echinacea	Treatment of upper respiratory tract infections (children)
Vitamin C	Common cold prevention (general)
Traditional or Theoretical Uses which Lack Sufficient Evidence
Therapy	Specific therapeutic Use(s)
Abuta	Bronchitis
Acacia	Pharyngitis
Acerola	Colds
Aconite	Bronchitis
Adrenal extract	Colds
Agrimony	Sore throat
Allspice	Colds
American pennyroyal	Chest congestion
Anise	Bronchitis
Apple cider vinegar	Sore throat
Arabinogalactan	Common cold
Arabinoxylan	Respiratory disease
Arginine	Cold prevention
Arnica	Bronchitis
Asarum	Bronchitis
Ashwagandha	Bronchitis
Asparagus	Bronchial congestion
Astragalus	Bronchitis
Bacopa	Bronchitis
Bael fruit	Colds
Barberry	Respiratory disorders
Barley	Bronchitis
Bay leaf	Bronchitis
Bee pollen	Bronchitis
Belladonna	Colds
Bellis perennis	Bronchitis
Berberine	Respiratory disorders
Beta-carotene	Acute respiratory infections
Beta-glucan	Common cold
Betel nut	Respiratory stimulant
Betony	Bronchitis
Bilberry	Common cold
Bitter melon	Respiratory infections
Bitter orange	Nasal congestion
Black cohosh	Bronchitis
Black currant	Colds
Black tea	Acute pharyngitis
Blessed thistle	Colds
Bloodroot	Bronchitis
Blue cohosh	Bronchitis
Blue flag	Colds
Boneset	Bronchitis (acute)
Boswellia	Upper respiratory infections
Bromelain	Bronchitis
Buchu	Colds
Bupleurum	Bronchitis
Burdock	Common cold
Butterbur	Colds
Calamus	Bronchitis
Calendula	Influenza
Cardamom	Bronchitis
Carrot	Tonsillitis
Cat's claw	Colds
Chamomile	Nasal inflammation
Chaparral	Bronchitis
Chasteberry	Fluid retention
Cherry	Colds
Choline	Bronchitis (dust-induced)
Chondroitin sulfate	Respiratory ailments
Cinnamon	Bronchitis
Coleus	Bronchitis
Colloidal silver	Colds
Comfrey	Bronchitis
Copper	Bronchitis
Cordyceps	Chronic bronchitis
Couch grass	Bronchitis
Cranberry	Influenza
Damiana	Respiratory problems
Dandelion	Bronchitis
Datura wrightii	Nasal congestion
Desert parsley	Bronchitis
Devil's club	Colds
DHEA	Influenza
Dogwood	Respiratory ailments
Dong quai	Bronchitis
Echinacea	Influenza
Elderberry and elder flower	Colds
Elecampane	Bronchial congestion
Ephedra	Colds
Eucalyptus oil	Bronchitis
Euphorbia	Respiratory disorders
Eyebright	Bronchitis (chronic)
Fennel	Bronchitis
Fenugreek	Bronchitis
Feverfew	Colds
Flaxseed and flaxseed oil	Acute respiratory distress syndrome (ARDS)
Garcinia	Influenza (Garcinia kola)
Garlic	Bronchitis
Germanium	Influenza
Ginger	Bronchitis
Ginkgo	Bronchitis
Ginseng	Influenza
Goldenrod	Pharyngitis (sore throat)
Goldenseal	Bronchitis
Gotu kola	Bronchitis
Grape seed	Respiratory tract infections
Grapefruit	Common cold
Ground ivy	Bronchitis
Guggul	Mouth infections
Gumweed	Bronchitis
Hawthorn	Sore throat
Heartsease	Bronchitis
Holy basil	Bronchitis
Honey	Respiratory infections
Horny goat weed	Chronic bronchitis
Horseradish	Respiratory disorders
Hyssop	Bronchitis
Ignatia	Nasal problems
Iodine	Respiratory congestion
Jequirity	Bronchitis
Juniper	Colds
Kava	Colds
Khella	Bronchitis
Kudzu	Colds
Labrador tea	Colds
Lavender	Bronchitis
Lemon balm	Chronic bronchitis
Lemongrass	Common cold
Licorice	Bronchitis
Lime	Colds
Liver extract	Influenza virus infection
Lovage	Bronchitis
Lycopene	Respiratory infections
Marshmallow	Bronchitis
Mastic	Bronchitis
Meadowsweet	Bronchitis
Melatonin	Acute respiratory distress syndrome (ARDS)
Milk thistle	Bronchitis
Morus nigra	Bronchitis
Muira puama	Influenza
Mullein	Bronchitis
Neem	Colds/flu
Noni	Colds
Nopal	Chest congestion
Nux vomica	Colds
Olive leaf	Common cold
Omega-3 fatty acids, fish oil, alpha-linolenic acid	Acute respiratory distress syndrome (ARDS)
Oregano	Bronchitis
Pantothenic acid	Cold prevention
Peony	Common cold
Peppermint	Common cold
Perilla	Colds
Pleurisy	Bronchitis
Polypodium leucotomos extract and anapsos	Upper respiratory tract infection
Pomegranate	Bronchitis
Psyllium	Bronchitis
Raspberry	Influenza
Red clover	Bronchitis
Reishi mushroom	Bronchitis
Resveratrol	Influenza
Rhodiola	Common cold
Riboflavin	Glossitis (tongue inflammation)
Rosemary	Respiratory disorders
Rutin	Common cold
Sage	Bronchitis
Sanicle	Bronchitis
Saw palmetto	Bronchitis
Scotch broom	Bronchitis
Sea buckthorn	Colds
Seaweed, kelp, bladderwrack	Sore throat
Shiitake	Common cold
Skunk cabbage	Bronchitis
Slippery elm	Bronchitis
Sorrel	Nasal inflammation
Soy	Respiratory problems (cough
Spirulina	Influenza
Spleen extract	Common cold
Squill	Chronic bronchitis
St. John's wort	Influenza
Star anise	Bronchitis
Stinging nettle	Nasal polyposis (growths)
Sweet basil	Chronic bronchitis
Tamanu	Sore throat
Tamarind	Colds
Tea tree oil	Bronchial congestion
Thyme	Flu
Thymus extract	Bronchitis (asthma)
Tribulus	Sore throat
Tylophora	Bronchitis
Uva ursi	Bronchitis
Vitamin C	Bronchitis
Vitamin O	Chronic bronchitis
Watercress	Bronchitis
Wheatgrass	Sore throat
White horehound	Bronchitis
White oak	Bronchitis
White water lily	Pharyngitis (sore throat)
Willow bark	Colds
Yarrow	Colds
Yellow dock	Common cold
Yew	Colds