Chamomile tea has the strongest research backing for anxiety relief, but green tea, lavender tea, and passionflower tea also show calming effects through different mechanisms. None of these are replacements for clinical treatment of an anxiety disorder, but they can be a low-risk addition to your routine, with a few important exceptions worth knowing about.
Chamomile: The Most Studied Option
Chamomile is the tea most frequently tested in clinical anxiety trials, and the results are consistently positive. Multiple studies on people diagnosed with generalized anxiety disorder (GAD) have found that chamomile significantly reduces anxiety scores compared to placebo. One long-term trial also showed improvements in psychological well-being, though it didn’t fully prevent GAD relapse on its own.
The calming effect appears to come from a compound called apigenin, a flavonoid found naturally in chamomile flowers. Apigenin works by binding to the same brain receptors targeted by many prescription anti-anxiety medications: GABA receptors. When these receptors are activated, nerve activity slows down, producing a mild sedative and anxiolytic effect. It’s a much gentler version of the same basic mechanism, which is why chamomile won’t knock you out but can genuinely take the edge off.
Most clinical trials used chamomile extract in capsule form at higher concentrations than a single cup of tea delivers. That said, regularly drinking chamomile tea still provides apigenin, and steeping your tea for at least seven minutes extracts significantly more of these beneficial compounds than a quick dip. Use boiling or near-boiling water and let the bag or loose flowers sit covered to retain the volatile oils.
Green Tea and L-Theanine
Green tea contains an amino acid called L-theanine that promotes relaxation without drowsiness. L-theanine increases alpha brain wave activity, the pattern associated with calm, focused attention. This makes green tea a better daytime option than chamomile if you need to stay sharp while managing anxious feelings.
There’s a catch, though. A standard cup of green tea contains only about 8 mg of L-theanine on average. Most studies showing meaningful anxiety reduction use doses of 200 mg or more, which means you’d need to drink an impractical amount of green tea to match those study conditions. Black tea actually contains more L-theanine per cup (around 24 mg), but even that falls well short of clinical doses. If you find green tea calming, the ritual and the moderate L-theanine content likely both contribute, but for a stronger effect, a standalone L-theanine supplement would be more reliable.
Green tea also contains caffeine, typically 25 to 50 mg per cup. For some people with anxiety, caffeine worsens symptoms. If that’s you, look for decaffeinated green tea, which retains some L-theanine with minimal caffeine.
Lavender Tea
Lavender has a long folk reputation for calming nerves, and clinical research supports it, though most studies have tested lavender oil capsules rather than brewed tea. In a meta-analysis of clinical trials, a standardized oral lavender oil preparation reduced anxiety scores by about 3 points more than placebo, and just over half of participants (52%) qualified as treatment responders compared to 39% on placebo.
Brewing dried lavender buds into tea delivers the same aromatic compounds, including linalool, at lower concentrations. There’s also an aromatherapy component: simply inhaling the steam from lavender tea activates calming pathways before you even take a sip. For a stronger brew, use one to two tablespoons of dried culinary lavender per cup, steep for five to seven minutes, and keep the cup covered to trap the volatile oils that would otherwise evaporate.
Passionflower Tea
Passionflower (Passiflora incarnata) is another herbal tea with evidence for anxiety. Like chamomile, it appears to work through GABA receptor modulation. Small clinical trials have found it comparable to some low-dose anti-anxiety medications for situational anxiety, such as pre-surgery nervousness, with fewer side effects like daytime drowsiness.
Passionflower tea is widely available in health food stores, often blended with chamomile or lemon balm. It has a mild, slightly grassy flavor. If you’re taking any sedative medications, including benzodiazepines like lorazepam, avoid passionflower. The NHS specifically warns against combining herbal anxiety remedies with these drugs because they amplify each other’s sedative effects.
Valerian Root: Better for Sleep Than Anxiety
Valerian root tea is often marketed for anxiety, but the evidence doesn’t support that specific use very well. According to the National Center for Complementary and Integrative Health, there isn’t enough evidence to draw conclusions about valerian’s effectiveness for anxiety. Its more common use is as a sleep aid, though even that evidence is inconsistent enough that the American Academy of Sleep Medicine recommended against it for chronic insomnia in 2017.
Valerian also comes with more safety considerations than the other teas on this list. It’s considered safe for short-term use (up to about six weeks at typical doses), but its long-term safety is unknown. More concerning: stopping valerian abruptly after regular use can cause withdrawal symptoms including rebound anxiety, irritability, insomnia, and in rare cases, hallucinations. If you do try valerian tea, use it occasionally rather than daily, and taper off rather than stopping suddenly.
Interactions With Anxiety Medications
If you’re taking prescription medication for anxiety, some herbal teas can cause problems. The NHS warns against combining valerian or passionflower with benzodiazepines like lorazepam because the sedative effects stack, potentially causing excessive drowsiness or impaired coordination. This applies to other sedating medications as well.
Chamomile, green tea, and lavender tea are generally lower risk, but herbal products are not tested for drug interactions the same way pharmaceuticals are. If you’re on SSRIs, benzodiazepines, or other psychiatric medications, mention your tea habits to your prescriber. Chamomile in particular has mild blood-thinning properties that could matter if you’re on anticoagulant medications.
How to Get the Most From Your Tea
The difference between a therapeutic cup and flavored hot water often comes down to preparation. Research on herbal tea brewing found that steeping for at least seven minutes extracts substantially higher levels of the beneficial plant compounds, including the flavonoids and polyphenols responsible for calming effects. Most people steep for two to three minutes, which leaves a significant amount of the active compounds still locked in the plant material.
Cover your cup while steeping. Many of the compounds that give chamomile and lavender their calming properties are volatile oils that escape with the steam. A small plate over the mug or a teapot with a lid makes a noticeable difference. Use water that’s just off the boil for chamomile, lavender, passionflower, and valerian. For green tea, slightly cooler water (around 175°F or 80°C) prevents bitterness while still extracting L-theanine effectively.
Timing matters too. For general anxiety management, a cup in the late afternoon or early evening works well. For sleep-related anxiety, drink your tea about 30 to 60 minutes before bed. If you’re using green tea, keep it to the morning or early afternoon to avoid caffeine interference with sleep.