How Many Cups of Chamomile Tea Should You Drink Per Day?

Nobody has set a safe upper limit for chamomile tea. There is no human dose-finding or toxicity study we could find, no tolerable upper intake level, and no regulatory ceiling. What exists instead is a short list of doses researchers have actually put into people, and that list clusters tightly around one to three cups a day for a few weeks at a time.

Worth sitting with for a second: "three cups a day is fine" is not a finding. It is the most anyone has bothered to test. Above that, you are past the edge of the map.

How much chamomile did the trials actually give people?

Two very different products get called chamomile in the literature: brewed flowers, and pharmaceutical-grade extract in a capsule. Most of the encouraging headlines come from the capsules. Here is what was measured out.

• Tea: 3 g of dried flowers per 150 mL, three times daily, eight weeks. An Iranian team randomized 64 adults with type 2 diabetes to this regimen or plain water and reported lower HbA1c and less insulin resistance, across two papers drawn from the same 64 participants (PubMed, PubMed). The evidence here is limited: the control group drank water, so participants knew which arm they were in, and no independent group has replicated it. It is the highest tea dose in the published record, and no adverse effects were reported — though the trial was not designed to look for them.
• Tea: daily for two weeks. Eighty Taiwanese postpartum women with poor sleep scored better on one sleep subscale and on depression symptoms than women given usual postpartum care. There was no placebo, so nobody was blinded, and by the four-week follow-up both differences were gone (PubMed).
• Capsules: 270 mg twice daily, 28 days. A randomized, double-blind, placebo-controlled pilot in 34 adults with chronic insomnia found no significant difference from placebo on any sleep-diary measure (PubMed).
• Capsules: 200 mg twice daily, 28 days. Sixty nursing-home residents in a single-blind trial reported better sleep quality on chamomile extract than on wheat-flour capsules (PubMed).
• Capsules: 1,500 mg daily, eight weeks. The generalized anxiety work — the one place chamomile's evidence reaches moderate, and only for the extract — used this dose in an open-label, uncontrolled phase of 179 people (PubMed). It followed a double-blind trial in 57 adults with mild-to-moderate generalized anxiety disorder, in which anxiety scores fell significantly further on chamomile than on placebo, by a slim margin (PubMed).

Notice the pattern. The most-cited results came from capsules, and the studies of the actual drink are small, short, and mostly unblinded. Our full chamomile tea page walks through each one.

Is a cup of tea the same as the capsules in the studies?

No, and the gap matters more than most articles admit. A standard tea bag holds roughly one to two grams of dried flowers. Only a fraction of the plant's compounds dissolve into 200°F water in three to five minutes, and nothing on the box tells you how much apigenin ended up in your mug. The trial capsules were standardized. Your tea is not.

Does drinking more chamomile tea do more?

There is no evidence that it does. No trial has compared one cup against three, so no dose-response curve exists. A 2024 systematic review identified ten trials and 772 participants, then pooled the five that reported the Pittsburgh Sleep Quality Index: scores fell by about 1.9 points, but the trials disagreed sharply with one another. The same review found no improvement in sleep duration, sleep efficiency, or daytime functioning, though most trials that counted night-time awakenings reported fewer of them (PubMed). A 2019 meta-analysis found a similar split: pooled sleep-quality scores improved, while the single insomnia trial it located showed no change in insomnia severity (PubMed).

Chamomile's apigenin does get absorbed. In a clinical study of healthy men, apigenin metabolites peaked in blood about two hours after chamomile tea, and the equivalent of 34% of the intake turned up in urine (PubMed). That is pharmacology, not a clinical result. It says the compound reaches your bloodstream. It says nothing about whether a fourth cup buys you anything.

Is it safe to drink chamomile tea every day?

For most healthy adults, likely yes. NCCIH calls chamomile likely safe when taken by mouth in the amounts commonly found in teas, and NIH's LiverTox database gives it likelihood score E — an unlikely cause of clinically apparent liver injury, noting that despite widescale use chamomile has not been convincingly linked to it.

But be clear about what "safe" rests on. The eight-week diabetes trial is the longest study of the drink, and it was not designed to detect harm. A separate study had healthy volunteers drink chamomile tea daily for two weeks and measured their urinary metabolites, not their safety (PubMed). Long-term daily use has never been formally studied. Its reassuring record comes from centuries of ordinary use — the traditional tier of evidence, not the clinical one.

Two cautions that tea sellers skip:

Iron. In a controlled human study using radiolabeled iron, a chamomile infusion cut non-heme iron absorption from a bread meal by 47% (PubMed). Black tea and peppermint were worse, but chamomile was not innocent. That was a single meal and a surrogate measure, so it does not show that chamomile causes anemia. Still: if you are iron-deficient or eating a mostly plant-based diet, put your cups between meals rather than with them.

Your bladder. Three cups is around 24 ounces of fluid. If two of them land after 9 p.m., the tea may cost you more sleep than it buys.

Who should drink fewer cups, or none at all?

For some people the right number is zero, however gentle the tea sounds.

• Anyone allergic to ragweed, mugwort, chrysanthemums, marigolds or daisies. Chamomile is in the same plant family and shares allergens with them, and NCCIH says those allergies raise the risk of a reaction. In a case series of 14 people sensitized to chamomile, ten had a history of immediate-type reactions, some life-threatening, and most were also sensitized to mugwort or birch pollen (PubMed). A separate case report describes anaphylaxis to chamomile tea in a patient with mugwort pollen allergy (PubMed). Hives, facial or throat swelling, or wheezing after a cup is a call-911 situation. This is the one chamomile risk that can be immediately dangerous, and it does not depend on how many cups you drink.
• Anyone on warfarin, another anticoagulant, or an antiplatelet drug, unless a prescriber has cleared it. A 70-year-old woman on warfarin was hospitalized with multiple internal hemorrhages after using chamomile tea and body lotion (PubMed), and a 2020 systematic review lists chamomile tea among products linked to bleeding on warfarin (PubMed). A case report is not proof of cause. The consequence is severe enough that it does not need to be.
• Anyone taking cyclosporine, unless a transplant team has cleared it. A review of herb-drug interactions reports chamomile raising cyclosporine blood levels in patients, and cyclosporine has almost no margin for error (PubMed).
• Infants under 12 months. Dried chamomile can carry Clostridium botulinum spores — one study found them in 7.5% of 200 samples — and steeping water is not hot enough to destroy spores (PubMed). Not one cup. Not a spoonful.
• Anyone taking sedatives, sleep medicines, opioids, or drinking alcohol. NCCIH flags a theoretical interaction between chamomile and sedatives. Additive drowsiness has not been demonstrated in trials, but it has not been ruled out either. Chamomile makes some people sleepy, so see how a cup affects you before you drive.
• Anyone on insulin or another glucose-lowering drug. The single tea trial reported lower HbA1c and fasting insulin, so additive blood-sugar lowering is plausible. It has never been demonstrated. If you plan to drink it daily, tell your prescriber.
• Anyone on a drug with a narrow safety margin. NCCIH reports that interactions between chamomile and some drugs metabolized by the liver have been documented. Ask a pharmacist before making it a daily habit.
• Anyone facing surgery, until the surgical team knows. Herbal products are routinely stopped beforehand.
• Anyone on hormonal birth control, worth a word with a pharmacist: NCCIH says preliminary studies suggest taking chamomile alongside birth control pills might decrease their effect.

On pregnancy and breastfeeding, NCCIH says plainly that little is known. Occasional food amounts have not been shown to cause harm; daily medicinal use has never been properly studied. Ask your doctor or midwife.

When in the day should those cups go?

Chamomile has no caffeine, so unlike green or black tea it imposes no cutoff time. Brew it at about 200°F for three to five minutes, covered, so the aromatic oils do not leave with the steam.

If sleep is the goal, tradition puts the cup 30 to 60 minutes before bed, and the two-hour blood peak for apigenin metabolites does not contradict that — though no trial has tested timing against sleep outcomes. Be realistic: the one randomized, placebo-controlled trial in adults with chronic insomnia found no significant improvement in any sleep-diary measure. The reliable part of a bedtime cup may be the ritual rather than the flavone, and that goes for most teas people drink for sleep, passionflower tea included.

The bottom line

One to three cups a day is the range the research has actually explored, and three cups a day for eight weeks is the most anyone has been given in a published trial without reported harm. There is no evidence that more does more. No toxic dose has been established either — but that reflects how little has been studied, not a clean bill of health. The risks that are documented — allergy, warfarin, cyclosporine, infants — barely depend on cup count.

Drink it because you like it. Drink it between meals if your iron is low. And if you were hoping a fourth cup would finally fix your sleep, read what the chamomile evidence actually shows, then talk to a doctor about CBT-I.

Photo: Chamomile (14561518539).jpg by YuJeen from Riga, Latvia — CC BY 2.0. Cropped and re-encoded.

Last reviewed and updated July 9, 2026. HelperTea is written by an enthusiast, not a clinician, and is not medically reviewed. How we research and rate evidence. Found an error? Tell us — safety corrections get priority.