No clinical trial has directly tested chamomile tea as a treatment for heart palpitations, so anyone hoping for a clear “yes, it works” will be disappointed by the current evidence. What does exist is a cluster of indirect findings that make chamomile a plausible choice for people whose palpitations are linked to anxiety or stress: the tea has demonstrated calming effects on the nervous system, its key compounds relax blood vessels through measurable biological pathways, and it contains no caffeine. Whether those properties add up to fewer skipped or racing heartbeats depends heavily on what is causing the palpitations in the first place.
Most Palpitations Start with Anxiety, and Chamomile Addresses That
The single strongest case for chamomile tea and palpitations is the well-documented link between anxiety and the sensation of a pounding, fluttering, or skipping heart. Stress hormones like adrenaline speed up the heart and can trigger premature beats. If anxiety is the engine behind your palpitations, anything that dials anxiety down has a reasonable shot at reducing them too.
Chamomile has real, if modest, anti-anxiety effects. A randomized, double-blind, placebo-controlled trial in patients with generalized anxiety disorder found that chamomile extract produced a significantly greater reduction in anxiety scores compared with placebo, leading the researchers to describe its anxiolytic activity as “modest” but real.1PubMed Central. A randomized, double-blind, placebo-controlled trial of oral Matricaria recutita (chamomile) extract therapy for generalized anxiety disorder A broader systematic review of ten clinical trials concluded that nine of them found chamomile effective at reducing anxiety.2PubMed Central. The Effect of Oral Chamomile on Anxiety: A Systematic Review of Clinical Trials The consistency across studies is more convincing than any single trial would be on its own.
One of the mechanisms behind this calming effect involves a flavonoid called apigenin, which is chamomile’s most studied bioactive compound. In animal research, apigenin has been shown to activate GABA-A receptors in the brain, the same family of receptors targeted by anti-anxiety drugs like benzodiazepines, though apigenin appears to work through a different binding site.3Frontiers in Nutrition. Apigenin: a natural molecule at the intersection of sleep and aging The effect is gentler and slower in onset than a pharmaceutical, which is consistent with what people report subjectively: chamomile tea feels mildly relaxing rather than sedating.
Chamomile Compounds Relax Blood Vessels Directly
Beyond calming the mind, chamomile’s compounds appear to act on the cardiovascular system itself. A laboratory study using isolated porcine coronary and splenic arteries found that apigenin, luteolin, and bisabolol (all found in chamomile) produced slow, concentration-dependent relaxation of the blood vessel walls. The relaxation was not driven by the usual nitric oxide pathway. Instead, the researchers showed it resulted from inhibition of calcium influx into smooth muscle cells. When extracellular calcium was removed, the relaxation effect disappeared, confirming calcium channels as the key target.4PubMed. Distinct mechanisms of relaxation to bioactive components from chamomile species in porcine isolated blood vessels
This is a distinct mechanism from the anxiety-reduction pathway. Even if you are not anxious, chamomile’s compounds may reduce vascular tone. Whether the concentrations that reach your bloodstream from a cup of tea are high enough to produce a meaningful effect in living humans is less certain. A pharmacokinetic study in healthy adults found that after drinking chamomile tea, apigenin metabolites peaked in the blood around two hours later, with urinary excretion equivalent to about a third of intake, suggesting the body does absorb a meaningful share of what is in the cup.5PubMed. Absorption, distribution, metabolism and excretion of apigenin and its glycosides in healthy male adults That said, reaching blood-vessel-relaxing concentrations through tea alone is a bigger ask than absorbing a detectable amount, and no human study has confirmed the vascular effect translates from the lab dish to actual cardiovascular outcomes.
The Caffeine-Free Angle
One of the simplest benefits of chamomile tea for someone experiencing palpitations is what it does not contain: caffeine. The relationship between caffeine and heart rhythm is more complicated than most people assume, though.
The largest study to use 24-hour heart monitoring to measure the effect of caffeinated products on extra heartbeats found no relationship between habitual coffee, tea, or chocolate consumption and the frequency of premature atrial or ventricular contractions.6PubMed Central. Consumption of Caffeinated Products and Cardiac Ectopy For most healthy people, moderate caffeine does not appear to trigger the kind of extra beats that drive palpitations. However, in a smaller study of patients who already had ventricular dysrhythmias, caffeine ingestion did significantly increase the frequency of abnormal beats.7Chest. The Effect of Caffeine on Cardiac Rate, Rhythm, and Ventricular Repolarization The researchers concluded that while caffeine appears safe for people without underlying heart rhythm problems, caution is warranted for those already prone to extra beats.
So if you are someone who notices palpitations after coffee or caffeinated tea, switching to chamomile removes that variable entirely. And even if caffeine is not the cause, eliminating it is a reasonable first step while you figure out what is going on. You lose nothing nutritionally by swapping, and you may gain the calming benefits discussed above.
The Ritual and Warmth of a Hot Drink
There is a subtler layer to the chamomile-and-palpitations question that has nothing to do with flavonoids. The act of sitting down with a hot drink changes your physiology in measurable ways. A crossover study in healthy adults found that consuming a hot beverage rapidly increased skin temperature by nearly two degrees Celsius, with peak effects appearing within ten to thirty minutes.8Psychopharmacology. Effects of hot tea, coffee and water ingestion on physiological responses and mood: the role of caffeine, water and beverage type Warm peripheries are associated with parasympathetic dominance, the “rest and digest” branch of the nervous system that slows the heart. Caffeine in the beverage offset some of this effect and raised blood pressure slightly. In a caffeine-free drink like chamomile tea, you get the warmth without the stimulant counterbalance.
People sometimes dismiss the comfort of a warm drink as “just placebo,” but that framing sells it short. The physiological changes from warmth are real and measurable. For palpitations driven by a revved-up nervous system, the simple ritual of pausing, holding a warm cup, and sipping slowly works in the same direction as chamomile’s pharmacological effects. The two are complementary, not competing.
How Steeping Time Changes What Ends Up in Your Cup
If you are drinking chamomile tea partly for its bioactive compounds, how you brew it matters. A study comparing polyphenol extraction across different tea types found that roughly 80 to 90 percent of the total polyphenol content appeared in the water within the first five minutes of steeping.9Beverages. Total Polyphenol Content and Antioxidant Capacity of Tea Bags: Comparison of Black, Green, Red Rooibos, Chamomile and Peppermint over Different Steep Times Beyond five minutes, you get diminishing returns. So a quick dunk-and-remove approach leaves most of the good stuff behind, but there is no need to steep for fifteen or twenty minutes either. Five minutes in water that is just off a boil is a reasonable target.
Once absorbed, apigenin and its glycosides travel through the upper gastrointestinal tract. Some are metabolized in the gut itself, broken down by intestinal bacteria into smaller compounds that can be absorbed into the bloodstream.10PubMed Central. A Review on Flavonoid Apigenin: Dietary Intake, ADME, Antimicrobial Effects, and Interactions with Human Gut Microbiota This means the effect of a cup of chamomile is not instantaneous: it unfolds over a couple of hours as compounds are absorbed and metabolized. Expecting your heart to calm down mid-sip is unrealistic. A more accurate expectation is a gentle, delayed calming that builds over an hour or two, layered on top of the more immediate effects of warmth and the ritual itself.
Drug Interactions That Deserve Attention
Chamomile tea is generally safe, but it is not inert, and people who take certain medications need to be careful. The most clinically significant interaction involves warfarin, the blood thinner. Chamomile contains coumarin-like compounds that can amplify warfarin’s anticoagulant effect. A case report documented a 70-year-old woman on warfarin who was hospitalized with multiple internal hemorrhages after using chamomile products, including tea, while being treated for an upper respiratory infection.11PubMed Central. Warfarin interaction with Matricaria chamomilla A systematic review of herb-warfarin interactions classified chamomile as having a “major severity” interaction with the drug.12PubMed Central. Updates on the clinical evidenced herb-warfarin interactions Another systematic review reinforced this, listing chamomile tea among the foods and herbs associated with increased bleeding risk when combined with warfarin.13PubMed. Warfarin and food, herbal or dietary supplement interactions: A systematic review
If you take warfarin or another anticoagulant, talk to your prescriber before making chamomile tea a daily habit. An occasional cup is unlikely to cause a crisis, but regular heavy consumption is a different story.
Chamomile also interacts with cyclosporine, an immunosuppressant used after organ transplants. Patients using chamomile have shown increased cyclosporine blood concentrations, which can push the drug into toxic ranges.14PubMed Central. Cyclosporine and herbal supplement interactions Part of the explanation may lie in chamomile’s effect on liver enzymes. In vitro testing showed that chamomile essential oil inhibits several cytochrome P450 enzymes, with CYP1A2 being the most sensitive.15Life Sciences. Inhibitory effects of the essential oil of chamomile (Matricaria recutita L.) and its major constituents on human cytochrome P450 enzymes These enzymes process a wide range of medications. If chamomile slows them down, drugs that rely on those enzymes for clearance may linger longer in your system at higher levels. The practical risk from a single cup of tea is probably small, but it is worth mentioning to your doctor if you take medications metabolized through CYP1A2 or CYP3A4, which include some antidepressants, antipsychotics, and cardiac drugs.
Ragweed Allergies and Cross-Reactivity
Chamomile belongs to the Asteraceae family, the same botanical family as ragweed, mugwort, and chrysanthemums. If you are allergic to any of these plants, chamomile can trigger a reaction. In most cases that means itching, hives, or mild swelling, but severe reactions are possible. A case report documented a patient who experienced full anaphylaxis after drinking chamomile tea. Laboratory testing confirmed cross-reactivity between chamomile tea extract and the pollens of giant ragweed and mugwort, suggesting the patient reacted to chamomile because his immune system was already sensitized to Artemisia pollen.16PubMed. Anaphylactic reaction after the ingestion of chamomile tea: a study of cross-reactivity with other composite pollens
Anaphylaxis from chamomile tea is rare, but ragweed allergy is extremely common. If you know you react to ragweed during pollen season, try a small amount of chamomile tea first and wait before making it a nightly routine. And be aware that a sudden racing heartbeat after chamomile could be an allergic response rather than a palpitation, which would obviously change the picture entirely.
When Palpitations Need More Than Tea
The elephant in the room with any home remedy for palpitations is that not all palpitations are benign. Most are: a premature beat here, a brief flutter there, often in the setting of stress, poor sleep, or too much caffeine. But some palpitations reflect a genuine arrhythmia that warrants medical evaluation.
Research into how doctors distinguish benign from dangerous palpitations identifies several factors that shift the odds. A history of cardiac disease roughly doubles the likelihood that palpitations represent a true arrhythmia. Palpitations that occur during sleep or at work also raise the probability. On the other hand, a known history of panic disorder or episodes lasting less than five minutes make a cardiac arrhythmia less likely. One particularly striking physical sign is a regular rapid-pounding sensation in the neck during an episode, which dramatically increases the likelihood of a specific arrhythmia called atrioventricular nodal reentry tachycardia.17JAMA. Does This Patient With Palpitations Have a Cardiac Arrhythmia?
The practical guidance is straightforward. If your palpitations are infrequent, last briefly, and are not accompanied by chest pain, fainting, or shortness of breath, outpatient monitoring with a portable heart monitor is usually enough to sort things out.18PubMed. Palpitations and arrhythmias. Separating the benign from the dangerous If you experience fainting, chest pain, or severe breathlessness along with palpitations, that warrants urgent evaluation rather than a cup of tea.
Chamomile tea sits firmly in the “reasonable self-care for benign palpitations” category. It addresses some of the most common triggers, it avoids caffeine, and it carries minimal risk for people without the specific contraindications described above. Treat it as one tool in a broader approach that includes managing stress, getting enough sleep, and staying hydrated, while keeping your doctor informed if the pattern changes or symptoms worsen.
Chamomile Tea Versus Chamomile Extract
Most of the clinical research on chamomile and anxiety used concentrated extracts in capsule form, not brewed tea. The chamomile extract doses in the anxiety trials were standardized to contain a known quantity of apigenin, typically far more than what a single cup of tea delivers. A cup of chamomile tea brewed from a commercial tea bag provides a gentle dose of apigenin and other flavonoids, but it is a diluted and variable product compared with the pharmaceutical-grade extracts used in research.
This does not mean tea is useless. It means the effect is likely milder and less consistent. If you have tried chamomile tea and feel it helps you relax, the evidence supports the idea that something real is happening. If you have tried it and felt nothing, you may need a higher concentration of the active compounds than tea delivers. Standardized chamomile supplements are available over the counter, though the same drug-interaction cautions apply, and arguably more so since the doses are higher. The trade-off is that you lose the warmth, the ritual, and the hydration that come with a cup of tea, all of which contribute to the overall calming effect in ways a capsule cannot replicate.