Relationship: Influenza and green tea

Evidence supporting the use of: Green tea
For the health condition: Influenza

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Green tea (Camellia sinensis) has a long history of traditional use in East Asian cultures, but its application for influenza is increasingly supported by emerging scientific evidence rather than tradition alone. The primary bioactive compounds in green tea—catechins, particularly epigallocatechin gallate (EGCG)—have demonstrated antiviral properties in laboratory studies. In vitro experiments show that green tea catechins can inhibit the replication of the influenza virus by interfering with viral membrane fusion and suppressing neuraminidase activity, an enzyme critical for viral release from infected cells.

Several small-scale clinical studies and observational trials suggest that regular consumption of green tea or green tea extracts may reduce the incidence of influenza infection. For example, a randomized controlled trial in Japan found that daily green tea catechin and theanine supplementation significantly reduced the incidence of clinically diagnosed influenza in healthcare workers during flu season. Additionally, some epidemiological studies have reported a lower risk of influenza infection among populations with high green tea intake.

However, the current body of clinical evidence is limited by small sample sizes, variability in dosage, and potential publication bias. Larger, well-designed trials are needed to confirm efficacy and establish optimal dosing. Therefore, while there is moderate scientific support for the use of green tea in reducing influenza risk, the evidence is not yet robust enough to recommend it as a primary prevention or treatment strategy.

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Abies spectabilis
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Agrimony
AHCC
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Alliin
alpinia galangal
Alstonia scholaris
American Liverleaf
Anamarrhena
anamu
Andrographis
andrographolide
anemarrhena asphodeloides
apple cider vinegar
Asarum sieboldii
astragaloside
astragalus
avens
baicalin
Baikal Skullcap
balloon flower
balsam
Basidiomycota
bee propolis
benegut perilla (proprietary)
black garlic
Black Hellebore
black pepper
black seed
boneset
borage
Bryonia
Bupleurum
bupleurum falcatum
camu camu
carvacrol
catechins
caterpillar mushroom
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Chaenomeles lagenaria
chaga mushroom
Chondrus
chrysanthemum
cineole
Cistus
Clerodendrum phlomidis
Clerodendrum trichotomum
coconut oil
Coptis chinensis
cordyceps
coriolus mushroom
currant
dog rose
Echinacea
echinacea purpurea
Elder
elderberry
elk antler
Embelia
Ephedra
eucalyptus
Euphorbia
European Elder
fat liver oil
flavanones
flavones
flowering quince
frankincense
Gallesia
ganoderma
ginger
Glehnia littoralis
glehnia root
Glycyrrhizin
goldenseal
gooseberry
Greek mountain tea
green chiretta
green tea
Guaco
honey loquat syrup
honeysuckle
Houttuynia
Hyperoside
Immunoglobulin G
Indian frankincense
iridoids
L-cysteine
labrador tea
Lactobacillus casei
Lactoferrin
Lactoperoxidase
Ledebouriella
Lentinula edodes mycelia
lichen
licorice root
little ironweed
liverwort
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reishi mushroom
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selenium
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Other health conditions supported by green tea

Abdominal Pain
Abscesses
Acne
Addictions (coffee, caffeine)
Age Spots
Aging (prevention)
Allergies (food)
Allergies (respiratory)
Alzheimer's Disease
Antibiotics (alternatives to)
Anxiety
Anxiety Disorders
Appetite (excessive)
Arteriosclerosis
Arthritis
Asthma
Athletic and Exercise Aids
Autoimmune Disorders
Belching
Benign Prostate Hyperplasia
Bites and Stings
Bleeding (internal)
Blood in Urine
Bloodshot Eyes
Body Odor
Breast Lumps
Cancer (natural therapy for)
Cancer (prevention)
Cancer Treatment (reducing side effects)
Cardiovascular Disease
Cartilage Damage
Cellulite
Cervical Dysplasia
Chemotherapy (reducing side effects)
Chicken Pox
Cholesterol (high)
Cholesterol (low)
Chronic Obstructive Pulmonary Disorder
Circulation (poor)
Circulation (to the brain)
Cirrhosis of the Liver
Colds (antiviral)
Colds (decongestant)
Colds (general)
Colds (prevention)
Colds (with fever)
Colic (children)
Colitis
Colon (atonic)
Colon (spastic)
Concentration (poor)
Congestion
Congestion (bronchial)
Congestion (lungs)
Congestion (lymphatic)
Congestion (sinus)
Conjunctivitis
Constipation (adults)
Contagious Diseases
Convalescence
Cough (damp)
Cough (dry)
Cough (general)
Cough (spastic)
Cramps (menstrual)
Crohn's Disease
Cuts
Cystic Breast Disease
Cystic Fibrosis
Cytomealovirus
Dandruff
Debility
Dementia
Denture Sores
Depression
Dermatitis
Diabetes
Diabetic Retinopathy
Diarrhea
Digestion (poor)
Down Syndrome
Endometriosis
Epstein Barr Virus
Eye Infections
Eye Problems
Eyes (red or itching)
Fatigue
Fibroids (uterine)
Free Radical Damage
Fungal Infections
Gastritis
Gingivitis
Glaucoma
Hair (loss or thinning)
Headache (general)
Hemochromatosis
Hypertension
Inflammation
Influenza
Irritable Bowel Syndrome
Liver Detoxification
Memory and Brain Function
Oral Surgery
Parkinson's Disease
Perspiration (excessive)
PMS (general)
Polyps
Psoriasis
Rosacea
Skin (oily)
Stress
Triglycerides (high)
Ulcers
Urinary Tract Infections
Wrinkles

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Evidence supporting the use of: Green tea
For the health condition: Influenza

Table of Contents

Synopsis

Other ingredients used for Influenza

Other health conditions supported by green tea

Products containing green tea

Health Concerns

Brands

Evidence supporting the use of: Green teaFor the health condition: Influenza

Table of Contents

Synopsis

Other ingredients used for Influenza

Other health conditions supported by green tea

Products containing green tea

Evidence supporting the use of: Green tea
For the health condition: Influenza