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

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Green tea has been traditionally consumed for its calming and health-promoting properties, but there is also a growing body of scientific evidence suggesting it may help support stress reduction. The main bioactive component linked to stress relief is the amino acid L-theanine, which is found almost exclusively in tea leaves. L-theanine is known to cross the blood-brain barrier and influence brain neurotransmitters, particularly by increasing alpha brain wave activity, which is associated with a state of relaxed alertness.

Several clinical studies have shown that supplementation with L-theanine, at doses comparable to those found in several cups of green tea, can reduce subjective stress and anxiety in both healthy individuals and people exposed to stressful situations. For example, a randomized controlled trial published in 2016 found that participants who consumed L-theanine experienced lower stress responses and improved attention during cognitively demanding tasks. Another study in 2019 reported reduced cortisol (a stress hormone) levels in people who regularly consumed green tea extract.

While these studies suggest a tangible effect, the magnitude is generally modest, and the effects may vary depending on the amount of green tea consumed and individual sensitivity to its components. Additionally, the caffeine in green tea can have stimulating effects that counteract relaxation in some people. Overall, current evidence supports a moderate scientific basis for green tea’s use in managing stress, primarily due to the actions of L-theanine.

More about green tea
More about Stress

Other ingredients used for Stress

5-Hydroxytryptophan (5-HTP)
7,8-Dihydroxyflavone
7-Keto-DHEA
Acetyl L-carnitine
Acetyl-L-Tyrosine
Agarwood
Agastache
Agmatine
Agrimony
Akebia
Albizia
Algal protein
Alpha lactalbumin
alpha-pinene
AMP-activated protein kinase (AMPK)
anemarrhena asphodeloides
anise
Anserina
antler
Antrodia camphorata
apigenin
Aralia
Arginine aspartate
arjun tree
arjuna
ashitaba
ashwagandha
asparagus
astragalus
baccosides
Bacopa
Bacopin
bacoside
baicalein
baicalin
Baikal Skullcap
banana
banyan
Basidiomycota
bee pollen
benegut perilla (proprietary)
bergamot
betony
Bifidobacteria
Bifidobacterium bifidum
Bifidobacterium lactis
Bifidobacterium longum
biota seed
bird\'s nest
black ginger
Black spruce
black tea
bonito peptide
borage
brahmi
Buddha\'s hand
Bupleurum
bupleurum falcatum
C-phycocyanin
calamus
Calea zacatechichi
California poppy
Canscora
Capitate Valerian
cardamom
caterpillar mushroom
catnip
catuaba
Celastrus
Centella asiatica
Centella triterpenes
chaga mushroom
chamomile
cherimoya
Chinese fleeceflower
Chinese mountain ant
chocolate
chuchuhuasi
Clary sage
Clerodendrum phlomidis
coca
cocoa
Codonopsis
Convolvulus pluricaulis
Convolvulus prostratus
cordyceps
coriander
corktree
Corydalis
cowslip
curcumin
Cymbopogon martini
cypress
damiana
date
devil\'s club
DHA (docosahexaenoic acid)
dibenzo-alpha pyrones
dismutase
dodeca-2E, 4E, 8Z, 10Z/tetraenoic acid isobutylamide
dodeca-2E, 4E-dienoic acid isobutylamide
dong quai root
eleuthero
emblicanin
EPA (eicosapentaenoic acid)
epigallocatechin gallate (EGCG)
Eplotab
Erythrina
Eurycoma Longifolia
Ficus religiosa
fish
fish protein
flavones
fo-ti
fragrant rosewood
frankincense
Fumaria parviflora
GABA (gamma aminobutyric acid)
galactooligosaccharides
gardenia
gastrodin
Gelsemium
Ginsenosides
Glycine
goji berry
goldthread
gotu kola
green tea
Griffonia simplicifolia
guayusa
gum
heartwood
Hemidesmus
hericium mushroom
hibiscus
Homalomena
honeybush
Honokiol
hops
Hypericum
isoliquiritigenin
Japanese kadsura
jasmine
Jatamansi
jiaogulan
jujube
jujubosides
kanna
kava
kavalactones
kola nut
kuding tea
kudzu
Kukicha
L-ornithine
L-taurine
L-theanine
L-tryptophan
l-tyrosine
lactalbumin
lactiplantibacillus plantarum
lactium casein decapeptide
Lactobacillus brevis
Lactobacillus casei
Lactobacillus helveticus
Lactococcus rhamnosus
Lactucarium
Lactucopicrin
Large-leaved linden
Lavandin
lavender
lemon balm
Lentinula edodes mycelia
Leptadenia
limonene
linden
lingzhi
lion's mane
liquid liver fractions
longan
lotus
lupulinum
Lycium
maca
macaenes
macamides
magnesium
magnolia
magnolol
mandarin
mangiferin
maral root
Marjoram
Matcha
Mate
Meadow sage
Melatonin
Mentha haplocalyx
Mesembrine
Methylxanthine
Mimosa
Mimulus
Mint
Mistletoe
Monkey flower
Motherwort
Muira puama
Mulberry
Mulungu
Mung bean
Myrcene
Nardostachys
Night jessamine
noni
Nymphaea caerulea
oat
oolong tea
orchid
oriental arborvitae
Oxindole alkaloids
passionflower
Passionfruit
Patchouli oil
Pentatropis capensis
Pepper Bark Tree
Peppermint
perilla
phosphatidylserine
phospholipids
pine bark
Piper chaba
Pistachio
Polygala
polygala root
poppy
pregnenolone
Purple Monkeyflower
pyrroloquinoline disodium salt
pyrroloquinoline quinone
quail egg
Rauvolfia
Rehmannia
relora® (proprietary)
Rhodiola
Rooibos
Rosabin
rosavins
rose
rose oil
Safed musli
saffron
Safranal
Salidroside
Sandy Everlasting
Sarivan
sarsaparilla
sceletium
Schisandrins
Schizandrol A
Scleranthus annus
Semecarpus anacardium
sesame
Shankhpushpi
Shataverins
Shilajit
Sida cordifolia
silk tree
skullcap
spearmint leaf
Speedwell
Spikenard
spinach
St. John's Wort
Stachytarpheta cayennensis
star of Bethlehem
suma
Sumbul
Sweet Woodruff
Tagara
Taurine
Taxillus chinensis
Tetracyclic oxindole alkaloids
Tetrahydropalmatine
Traveler's Joy
Trichilia catigua
Trichopus zeylanicus
Uncaria
Valerenic acid
Valerian root
Vanilla
velvet bean
Verbena
Vetiver
Viburnum
Vine tea
vitamin B12
vitamin B6
Vitexin
Waterhyssop
whole adrenal glandular
Withanolides
Wogonin
Wood betony
Xanthine
Xanthone
Xanthophyll
Xylaria nigripes
Yellow-Fruit Nightshade
Yerba mate
Ylang ylang
Yohimbine
Yumberry
Yuzu
Zinc

Other health conditions supported by green tea

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
Breast Lumps
Cancer (natural therapy for)
Cancer (prevention)
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)
Fibroids (uterine)
Free Radical Damage
Fungal Infections
Glaucoma
Hemochromatosis
Irritable Bowel Syndrome
Parkinson's Disease
Perspiration (excessive)
PMS (general)
Polyps
Rosacea
Skin (oily)
Abdominal Pain
Abscesses
Body Odor
Cancer Treatment (reducing side effects)
Fatigue
Gastritis
Gingivitis
Hair (loss or thinning)
Headache (general)
Hypertension
Inflammation
Influenza
Liver Detoxification
Memory and Brain Function
Oral Surgery
Psoriasis
Stress
Triglycerides (high)
Ulcers
Urinary Tract Infections
Wrinkles