Best Tea for Stress Relief: 8 Teas With Trial Evidence on Stress and Cortisol
The best teas for stress are green tea (including matcha), holy basil and ashwagandha, because each has placebo-controlled human trials showing lower stress scores and, in several cases, lower cortisol. Matcha drinkers had a smaller rise in salivary stress markers; holy basil extract cut perceived stress and hair cortisol over eight weeks; ashwagandha root extract lowered serum cortisol by 28% in 60 days. Lemon balm, chamomile and rhodiola follow with smaller or shorter trials.
Stress is a physiological state, not just a feeling, and that is why tea can touch it. A warm drink taken slowly engages the vagus nerve and slows breathing; theanine in green tea dampens the sympathetic surge; adaptogens like ashwagandha and holy basil nudge the hypothalamic-pituitary-adrenal axis toward a lower resting output over weeks. None of this removes the cause of the stress. All of it lowers the cost your body pays while you deal with it.
Tea is not the answer if stress has tipped into something else. See a clinician if you have had weeks of poor sleep with exhaustion that rest does not fix, if you feel hopeless or detached, if you are drinking or using substances to cope, if you have chest pain, palpitations or breathlessness, or if your blood pressure is raised. Burnout and depression respond to treatment; they do not respond to a stronger herb.
Quick answer
- Green tea and matcha — theanine blunts the stress response; matcha drinkers showed a smaller rise in salivary stress markers in a trial
- Holy basil (tulsi) — 39% greater improvement in stress symptoms than placebo over six weeks; lowered hair cortisol in a 2022 trial
- Ashwagandha root decoction — the extract cut perceived stress 44% and cortisol 28% in 60 days; the tea is a gentler version
- Lemon balm — a lemon-balm drink reduced stress ratings within hours in a crossover study
- Rhodiola root — reduced burnout-related fatigue and the cortisol awakening response in a 28-day trial
- Black tea — six weeks of black tea lowered post-stress cortisol and sped relaxation in a placebo-controlled trial of 75 men
The 8 best teas for stress
Ranked by the strength of human evidence. Strong = multiple trials or a meta-analysis. Moderate = a few small trials. Preliminary = early, traditional or animal data.
Green tea's amino acid L-theanine, at 200 mg, reduced heart rate and salivary immunoglobulin responses to a mental stressor in a controlled study, and a 2020 systematic review found 200 to 400 mg a day reduces stress and anxiety in people under pressure. Tea itself has been tested: in a 2018 study, pharmacy students who drank 3 g of matcha a day for 15 days during exam stress showed a smaller rise in salivary alpha-amylase, a stress marker, than those drinking a low-theanine placebo matcha. In older adults, a week of low-caffeine green tea lowered the same marker and improved sleep. The ratio matters: theanine calms, caffeine excites, and matcha has the highest theanine per cup.
- Key evidence
- Unno et al., Nutrients 2018 (matcha RCT in students under exam stress); Kimura et al., Biological Psychology 2007.
- How to brew it
- Matcha: 1 to 2 g (half to one teaspoon) whisked into 80 to 150 ml water at 75°C, one serving before noon. Loose green tea: 2 g per 200 ml at 70°C for 2 minutes; the lower temperature extracts more theanine relative to caffeine.
- Best for
- Daytime, work-related stress where you still need to think clearly; not for people whose stress shows up as a racing heart after coffee.
- Cautions
- A 2 g serving of matcha carries 60 to 70 mg of caffeine; keep it to the morning and under 400 mg total caffeine a day. Reduces iron absorption from meals and can aggravate reflux. Keep intake steady if you take warfarin or nadolol.
In a six-week double-blind trial of 150 adults, 1,200 mg of holy basil extract a day improved overall stress symptoms, including exhaustion, forgetfulness and sleep problems, 39% more than placebo. A 2022 trial of 125 mg twice daily for eight weeks in 100 stressed adults lowered perceived stress scores, improved sleep quality and reduced hair cortisol, a marker of cortisol exposure over weeks, versus placebo. Holy basil has been a daily household tea in India for centuries, so the beverage form is a tested practice, if less concentrated than the capsules in the trials.
- Key evidence
- Saxena et al., Evidence-Based Complementary and Alternative Medicine 2012 (RCT, n=150); Lopresti et al., Frontiers in Nutrition 2022 (RCT, n=100, hair cortisol).
- How to brew it
- 1 to 2 teaspoons (2 to 3 g) dried leaf, 200 ml water at 90 to 95°C, covered, 5 to 8 minutes; two to three cups a day for at least four weeks.
- Best for
- Long-running, grinding stress with tiredness and poor sleep; a caffeine-free daytime tea.
- Cautions
- Lowers blood sugar modestly and has mild antiplatelet activity: take care with diabetes medication and blood thinners. Animal studies show reduced fertility at high doses, so avoid when trying to conceive or pregnant. Eugenol content means very high intakes can stress the liver.
The clearest cortisol data for any herb: in 64 chronically stressed adults, 300 mg of root extract twice daily for 60 days reduced Perceived Stress Scale scores by 44% versus 5.5% on placebo, and serum cortisol fell 28% versus 8%. A 2019 trial of 240 mg a day for 60 days reduced anxiety scores and morning cortisol, and a 2022 meta-analysis of 12 trials confirmed significant reductions in stress and anxiety. These were standardised extracts; a decoction of dried root delivers the withanolides at a lower, variable dose, so the effect is real but softer.
- Key evidence
- Chandrasekhar et al., Indian Journal of Psychological Medicine 2012 (RCT, n=64); Lopresti et al., Medicine 2019 (RCT with cortisol).
- How to brew it
- 3 to 5 g dried root pieces or 1 teaspoon powder, 300 ml water (or half milk), simmered 10 to 15 minutes, strained; one cup in the evening, daily for four to eight weeks.
- Best for
- Stress that has worn you down: wired-but-tired, poor sleep, high cortisol on a lab test.
- Cautions
- Can raise thyroid hormone levels; avoid with hyperthyroidism and mention it if you take levothyroxine. Avoid in pregnancy, with autoimmune disease flares, and alongside sedatives or immunosuppressants. Rare reports of liver injury with supplements; stop if you develop nausea, dark urine or jaundice.
Lemon balm has been tested as a drink, not just a pill. In a crossover study, a lemon-balm-containing beverage and a yogurt improved mood and reduced stress ratings over the following hours in healthy adults, with the drink also improving maths performance. A single 600 mg dose of leaf extract increased calmness and blunted the stress of a demanding cognitive task within an hour in an earlier trial. In 80 people with stable angina, eight weeks of 3 g a day lowered stress, anxiety and depression scores versus placebo. Rosmarinic acid, which slows GABA breakdown, is the main active.
- Key evidence
- Scholey et al., Nutrients 2014 (lemon balm drink and yogurt, crossover); Kennedy et al., Psychosomatic Medicine 2004.
- How to brew it
- 1.5 to 4.5 g (1 to 3 teaspoons) dried or fresh leaf, 200 ml water at 90°C, covered, 10 minutes; up to three cups a day. Covering the cup keeps the volatile oils in.
- Best for
- Acute stress during the day, including nervous stomach; it calms without making you drowsy.
- Cautions
- Interferes with thyroid-stimulating hormone binding in laboratory studies; keep to one to two cups if you take levothyroxine or have thyroid disease. Additive with sedatives. Culinary amounts are fine in pregnancy; daily high doses are untested.
Chamomile's trials are in anxiety rather than stress per se, but the overlap is large. In 57 adults with generalised anxiety disorder, eight weeks of chamomile extract reduced Hamilton Anxiety scores significantly more than placebo, and a 2019 meta-analysis of 12 randomised trials confirmed benefit for anxiety and sleep quality. In sleep-disturbed postnatal women, a cup of chamomile tea daily for two weeks lowered depression and sleep-inefficiency scores. For stress, it works best in the evening, when the mild sedation from apigenin is welcome.
- Key evidence
- Amsterdam et al., Journal of Clinical Psychopharmacology 2009 (RCT, n=57); Hieu et al., Phytotherapy Research 2019 (meta-analysis).
- How to brew it
- 2 to 3 g dried flowers (a heaped tablespoon or two bags), 200 ml water just off the boil, covered, 10 minutes; one to three cups a day, the last one 45 minutes before bed.
- Best for
- Stress that spills into the evening and disrupts sleep; the safest daily option for most people.
- Cautions
- Possible interaction with warfarin (case report). Avoid if allergic to ragweed, daisies or chrysanthemums. Daily medicinal doses are not well studied in pregnancy, though culinary amounts are considered low-risk.
In 60 adults with stress-related fatigue, 576 mg a day of a standardised rhodiola extract for 28 days reduced burnout scores and improved attention versus placebo, and lowered the cortisol awakening response, a marker of HPA-axis overdrive. An open-label 2012 study of 200 mg twice daily for four weeks in 101 people with life stress reported improvements in stress symptoms from day three. A 2012 systematic review found the trials promising but small and uneven in quality. The root makes a pleasant rose-scented decoction.
- Key evidence
- Olsson et al., Planta Medica 2009 (RCT, n=60, cortisol awakening response); Ishaque et al., BMC Complementary and Alternative Medicine 2012 (systematic review).
- How to brew it
- 2 to 3 g dried root pieces, 300 ml water, simmered gently 10 minutes or steeped 15 minutes covered; one cup in the morning, not after 2 p.m. because it is mildly stimulating.
- Best for
- Burnout-type stress with fatigue and foggy concentration; people who need a lift rather than a sedative.
- Cautions
- Mildly stimulating; can cause jitteriness or insomnia if taken late. Theoretical serotonergic interaction with SSRIs and MAOIs, so check with your prescriber. Avoid in bipolar disorder (may trigger agitation) and in pregnancy for lack of data.
The one trial that tested ordinary tea against a stress test: 75 healthy men drank either real black tea or a matched caffeinated placebo drink four times a day for six weeks, then faced challenging tasks. Both groups had the same spike in blood pressure and heart rate, but the tea drinkers' cortisol fell faster afterwards (47% lower an hour later versus 27%), they reported more relaxation, and platelet activation was lower. The authors credited tea polyphenols and theanine rather than caffeine, because the placebo contained caffeine too. One trial, so Preliminary, but a well-designed one.
- Key evidence
- Steptoe et al., Psychopharmacology 2007 (double-blind RCT, n=75, six weeks).
- How to brew it
- 2 to 3 g (one teaspoon or one bag) per 200 ml water just off the boil, 3 to 4 minutes; up to four cups a day, the last by mid-afternoon.
- Best for
- People who already drink black tea and want to know whether it is helping (it probably is) or hurting (only if it is replacing sleep).
- Cautions
- 40 to 70 mg of caffeine per cup; stop by early afternoon and keep total caffeine under 400 mg a day (200 mg in pregnancy). Black tea tannins cut non-haem iron absorption by up to 80 to 90% when drunk with meals, so leave an hour either side if you are iron-deficient.
Lavender's strongest evidence is for inhaled oil and for Silexan oral capsules, which reduced anxiety and restlessness in several large trials. The tea has one trial of its own: 80 sleep-disturbed postnatal women who drank a cup a day for two weeks reported less fatigue and depression than controls. Lavender in a cup is pleasant and mildly calming, and most of the effect probably comes through the nose, so breathe the steam before you drink.
- Key evidence
- Chen & Chen, Worldviews on Evidence-Based Nursing 2015 (tea RCT, n=80); Kasper et al., International Journal of Neuropsychopharmacology 2014 (Silexan).
- How to brew it
- 1 to 2 teaspoons (about 1.5 g) dried culinary lavender, 200 ml water at 90°C, 5 minutes, strained; blend into chamomile or lemon balm rather than drinking it alone.
- Best for
- Evening wind-down and people who respond to the scent.
- Cautions
- Mildly sedating; additive with sedatives. Oral lavender oil has case reports of breast growth in boys; keep children's intake occasional. Culinary lavender is low-risk in pregnancy; concentrated oil is not.
How to choose
- Stressed but need to perform (deadlines, exams): matcha or green tea in the morning, lemon balm in the afternoon.
- Stressed and exhausted, sleeping badly: holy basil in the day and an ashwagandha decoction in the evening, for at least four weeks.
- Burnout with brain fog: rhodiola in the morning; it is the one calming herb that also lifts energy.
- Stress that keeps you up at night: chamomile or lemon balm 45 minutes before bed; no caffeine after 2 p.m.
- Stress with a racing heart or panic: skip caffeine entirely, including green tea and matcha; choose chamomile, lemon balm or holy basil.
- On thyroid medication, blood thinners or SSRIs: chamomile or black tea are the low-interaction choices; check holy basil, ashwagandha, lemon balm and rhodiola with your clinician.
What to skip
'Adrenal fatigue' teas and blends
A 2016 systematic review of 58 studies found no evidence that adrenal fatigue exists as a diagnosis. Blends sold for it usually combine licorice (which raises blood pressure) with unproven herbs at unknown doses.
Licorice tea for 'adrenal support'
Glycyrrhizin blocks the enzyme that inactivates cortisol, so it raises cortisol exposure in tissues, and it raises blood pressure and lowers potassium with regular use. It is the opposite of what a stressed body needs.
CBD-infused teas
Trials used 300 mg or more of CBD; teas contain 5 to 20 mg, and CBD barely dissolves in water. The relaxation people report is the ritual, available for free.
Kava as a daily stress tea
Kava has short-term anxiety evidence but a liver-injury warning and a negative 16-week trial. It is not a daily beverage for chronic stress.
Safety and when to see a clinician
- Caffeine is the most common thing in a teacup that raises stress hormones. If your stress shows up as palpitations, tremor or poor sleep, cut caffeinated tea before adding herbs.
- Ashwagandha and lemon balm both affect thyroid function (in opposite directions); holy basil lowers blood sugar; rhodiola interacts with SSRIs. Tell your prescriber what you drink daily.
- Licorice-containing blends raise blood pressure and lower potassium within two weeks of regular use; avoid them with hypertension, heart or kidney disease, or diuretics.
- Pregnancy: chamomile, lemon balm in culinary amounts and up to 200 mg a day of caffeine are considered acceptable; avoid ashwagandha, holy basil, rhodiola, kava and licorice.
- Black and green tea reduce iron absorption from meals substantially; if you are tired and stressed, get your ferritin checked and keep tea an hour away from iron-rich food.
- See a clinician if stress comes with persistent insomnia, hopelessness, detachment, increased drinking, chest pain, palpitations, breathlessness or raised blood pressure, or if it has lasted more than a few months without relief.
What matters as much as the tea
- Sleep is the master stress regulator: one night under six hours raises next-day cortisol and amygdala reactivity more than any tea can offset.
- Thirty minutes of brisk walking most days lowers resting cortisol and improves stress tolerance; outdoors is better than indoors.
- Slow breathing, six breaths a minute for five minutes, measurably lowers heart rate and blood pressure in the session and is the real active ingredient in a tea break.
- Mindfulness-based stress reduction has dozens of trials showing moderate reductions in perceived stress; eight-week courses and apps both work.
- Alcohol feels like stress relief and raises cortisol overnight; cutting it is often the single biggest lever.
Frequently asked questions
What tea is best for stress and anxiety together?
Chamomile and lemon balm cover both: chamomile has an eight-week placebo-controlled trial in anxiety, and lemon balm has drink-based studies showing lower stress ratings plus pooled trials showing lower anxiety. Holy basil is the best caffeine-free daytime option for people whose stress has become long-term.
Does tea actually lower cortisol?
Some do, in trials. Black tea sped cortisol recovery after a stress test over six weeks; ashwagandha extract lowered serum cortisol 28% in 60 days; holy basil lowered hair cortisol over eight weeks; rhodiola reduced the cortisol awakening response in 28 days. The tea versions deliver smaller doses than the capsules, so expect a gentler effect.
Is green tea good for stress or does the caffeine make it worse?
Depends on the person and the dose. Its theanine reduces the physiological stress response and matcha drinkers showed lower stress markers during exams, but caffeine raises heart rate and anxiety in sensitive people. If green tea makes you feel calm and focused, keep it to mornings; if it makes you jittery, switch to decaf green or a caffeine-free herb.
How long does stress tea take to work?
Lemon balm and the ritual of a warm drink work within an hour. Green tea's theanine acts within 30 to 60 minutes. Holy basil, ashwagandha and rhodiola are cumulative: trials measured benefit after three to eight weeks of daily use, with the cortisol changes appearing at the month mark.
Can I drink stress-relief tea every day?
Chamomile, lemon balm, holy basil and green or black tea are fine daily. Ashwagandha and rhodiola have been used daily for eight to twelve weeks in trials; take a break after that and reassess. Avoid daily licorice or kava.
Which stress tea is safe in pregnancy?
Chamomile and lemon balm in one to two cups a day, and black or green tea within 200 mg of caffeine a day, are generally considered acceptable. Avoid ashwagandha, holy basil, rhodiola, kava and licorice, which either lack safety data or have known risks. Ask your midwife if stress is affecting your sleep or mood.
References
- Kimura K, Ozeki M, Juneja LR, Ohira H. L-Theanine reduces psychological and physiological stress responses. Biological Psychology (2007)
- Unno K, Furushima D, Hamamoto S, et al.. Stress-reducing function of matcha green tea in animal experiments and clinical trials. Nutrients (2018)
- Steptoe A, Gibson EL, Vuononvirta R, et al.. The effects of tea on psychophysiological stress responsivity and post-stress recovery: a randomised double-blind trial. Psychopharmacology (2007)
- Scholey A, Gibbs A, Neale C, et al.. Anti-stress effects of lemon balm-containing foods. Nutrients (2014)
- Kennedy DO, Little W, Scholey AB. Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis (lemon balm). Psychosomatic Medicine (2004)
- Saxena RC, Singh R, Kumar P, et al.. Efficacy of an extract of Ocimum tenuiflorum (OciBest) in the management of general stress: a double-blind, placebo-controlled study. Evidence-Based Complementary and Alternative Medicine (2012)
- Lopresti AL, Smith SJ, Metse AP, Drummond PD. A randomized, double-blind, placebo-controlled trial investigating the effects of an Ocimum tenuiflorum (holy basil) extract (Holixer) on stress, mood, and sleep in adults experiencing stress. Frontiers in Nutrition (2022)
- Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine (2012)
- Lopresti AL, Smith SJ, Malvi H, Kodgule R. An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: a randomized, double-blind, placebo-controlled study. Medicine (2019)
- Olsson EM, von Schéele B, Panossian AG. A randomised, double-blind, placebo-controlled, parallel-group study of the standardised extract SHR-5 of the roots of Rhodiola rosea in the treatment of subjects with stress-related fatigue. Planta Medica (2009)
- Ishaque S, Shamseer L, Bukutu C, Vohra S. Rhodiola rosea for physical and mental fatigue: a systematic review. BMC Complementary and Alternative Medicine (2012)
- Cadegiani FA, Kater CE. Adrenal fatigue does not exist: a systematic review. BMC Endocrine Disorders (2016)
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Ask about tea for stressThis guide is educational and is not medical advice. Herbal teas can interact with prescription medicines. Talk with a clinician or pharmacist before relying on any of them, especially if you are pregnant, breastfeeding, have a chronic condition, or take medication.