Chamomile

Matricaria chamomilla is an annual in the daisy family (Asteraceae), native to southern and eastern Europe and western Asia and now weedy or cultivated almost worldwide. It grows 15 to 60 centimeters tall, with finely divided, almost feathery bipinnate leaves and branching stems that carry solitary flower heads. Each head has white ray florets around a golden disc of tubular florets. Crush a head: the scent is sweet-apple, not the sharper perfume of some look-alikes.

The diagnostic character used in pharmacognosy is the receptacle. In true German chamomile it is conical and hollow. That hollowness separates it from scentless mayweed and from Roman chamomile, whose receptacle is solid. Adulteration and confusion in bulk herb are old problems. A bag of “chamomile” that does not smell of apple, or that contains whole solid heads, may not be the drug described here.

The medicinal part is the dried flower head (Matricariae flos), harvested when rays are still horizontal and discs are opening. Leaves and stems are not the traditional drug, though they appear in cheap tea cuts. The blue color of distilled chamomile oil comes from chamazulene formed from matricin during steam distillation—it is not sitting in the fresh flower as a blue pigment.

Nomenclature is messy on purpose. Linnaeus’s Matricaria chamomilla and later Matricaria recutita / Chamomilla recutita refer to the same German plant in most modern use. Roman chamomile is Chamaemelum nobile (Anthemis nobilis). This page is German chamomile unless a source is quoted otherwise.

Chamomile’s written trail is Mediterranean and European. Egyptian, Greek, and Roman sources describe daisy-like “ground apples” (the folk etymology of chamaimēlon) for fever, digestive complaint, and as a wash. Medieval monastic gardens kept it as a strewing herb and a tea for “cold” stomachs. By the early modern period it was a household simple: infusion for colic and restlessness, poultice for inflamed skin, steam for a stuffed head.

German-speaking medicine made it official. The plant entered pharmacopoeias as Matricariae flos. The German Commission E approved German chamomile flower for gastrointestinal spasm and inflammatory diseases of the gastrointestinal tract, and for skin and mucosa—including as a bath or gargle—language that still shapes European herbal products. EMA’s HMPC later set a traditional-use monograph for matricaria flower: minor gastrointestinal complaints, mouth and throat irritation as a gargle, skin inflammation as a compress or wash, and inhalation for colds, among the listed traditional indications.

North American use arrived with settlers and with the later tea-bag industry. NCCIH notes that people take chamomile for sleeplessness, anxiety, and gastrointestinal upset, and that high-quality evidence is limited. A small randomized trial of a standardized extract in mild to moderate generalized anxiety (Amsterdam and colleagues, 2009) is often cited; it is not a license to treat panic disorder with grocery tea.

The modern market splits three ways: food-like tea, traditional herbal medicines in the EU, and dietary-supplement capsules or oils. Confusing those is how someone drinks a gallon of strong tea for “natural Xanax,” or puts undiluted essential oil in a baby’s bath because the flower is famous for gentleness.

The chemistry is a mix, not a single sleeping pill. The essential oil contains (−)-α-bisabolol and bisabolol oxides, plus matricin that becomes chamazulene on distillation. Flavonoids include apigenin and apigenin-7-glucoside; coumarins such as herniarin appear in smaller amounts. In the laboratory, apigenin can bind benzodiazepine receptors, bisabolol shows anti-inflammatory and antispasmodic activity, and chamazulene can inhibit inflammatory mediators. Those findings explain the traditional “calm the gut, calm the surface” use. They do not make a teabag equivalent to diazepam.

Tea extracts water-soluble flavonoids more readily than the full oil. Steam-distilled oil is a different exposure: more bisabolol and chamazulene, almost no tea polyphenols as drunk. Capsules of dried flower sit in between and vary by cut and harvest. Two products labeled chamomile can therefore disagree about both strength and which constituents dominate.

Any “sedative” effect of a bedtime cup is probably a blend of ritual, mild bitter-aromatic gut easing, and—at most—modest flavonoid activity. That is a reasonable traditional use. It is not a characterized hypnotic with a dose-response curve like a licensed sleep drug.

Traditional and European herbal-medicine uses cluster around two surfaces: the gut and the skin or mucosa. EMA lists traditional use of matricaria flower for minor gastrointestinal complaints (spasms, bloating, belching), as a mouthwash or gargle for minor inflammation of the mouth and throat, as a compress or wash for minor skin inflammation and small superficial wounds, and by inhalation for the common cold. Commission E’s older German approval is in the same neighborhood: GI spasm and inflammatory GI complaints, plus skin and mucosa.

Sleep and anxiety are what English-language marketing leads with. NCCIH summarizes that evidence chamomile helps insomnia or anxiety is limited. The 2009 Amsterdam trial found a modest reduction in GAD symptoms with a standardized German chamomile extract versus placebo in adults with mild to moderate generalized anxiety—not a cure, not tea bags, not severe illness. Extrapolating that extract to a supermarket infusion is a category error.

Infant colic teas and “calming” pediatric products have a long folk life and a thin evidence base. Asteraceae allergy and rare severe reactions after mucosal contact with liquid preparations are documented in regulatory herb texts. Homemade eye washes from tea bags are a contamination risk; they are not a substitute for sterile ophthalmic care.

Chamomile is sometimes sold for menstrual cramps, eczema, or “detox.” Those uses outrun the human data. A pleasant tea can still be a reasonable comfort for mild, self-limited digestive unease in adults who tolerate daisies. It is not a treatment plan for IBD, major depression, or infected wounds.

The household form is an infusion of dried flower heads. Traditional tea uses a covered cup so volatiles are not all lost to steam; strain before drinking. Taste is apple-floral and slightly bitter. Bags vary in how much true flower versus stem they contain. Loose, apple-scented heads are the more honest starting material.

European herbal medicines include comminuted flower, liquid extracts, and dry extracts, used internally or as gargles, compresses, baths, and inhalations according to the product. Follow the labeled preparation; a kitchen poultice is not a sterile wound dressing.

Essential oil and high-alcohol extracts are not “strong tea.” Do not swallow essential oil. Do not put undiluted oil on skin or in a child’s bath. People who tolerate a cup may still react to oil.

There is no single milligram dose that maps from Amsterdam’s extract to every teabag. Short traditional courses for minor complaints match how the flower was used. Months of high-dose capsules for anxiety are a clinician conversation, not a pantry protocol.

The important adverse story is allergy. Chamomile is Asteraceae. People who react to ragweed, chrysanthemums, marigolds, or daisies can develop contact dermatitis, rhinitis, or—rarely—anaphylaxis, including after tea or after mucosal contact with liquid preparations. EMA notes severe allergic reactions (including anaphylactic shock) of unknown frequency after such contact. “I’ve drunk it for years” is not a guarantee for the next cup if sensitization develops.

Otherwise, tea is usually well tolerated: mild nausea or sedation in some people. Vomiting after very strong infusions happens. Eye irritation follows getting tea or oil in the eye.

MedlinePlus and NCCIH flag possible interactions and the need for caution in pregnancy at medicinal doses. LiverTox does not list chamomile as a famous hepatotoxin; isolated reports in combination products are messy. Absence of a famous liver signal is not proof of unlimited intake.

Essential oil can irritate skin and mucosa. Blue oil staining is chemistry, not a burn by itself, but irritation still happens.

Do not use chamomile if you have a known hypersensitivity to chamomile, other Asteraceae, or the product’s excipients. That includes ragweed-allergic people who have had more than a theoretical risk discussion with a clinician—many can drink tea, some cannot, and self-experimenting after anaphylaxis to related plants is unwise.

Avoid liquid chamomile preparations on mucosa if you have a history of severe plant allergies. Do not give concentrated extracts or essential oil to infants. Tea for colic is a clinician question, not a default; botulism is a honey problem, not a chamomile problem, but airway and allergy still matter in babies.

Pregnancy: culinary-strength tea is often treated as food-like in later pregnancy, but medicinal-dose extracts and oils are generally avoided because reproductive toxicity data are incomplete (EMA notes the gap). Do not use chamomile to “bring on” menstruation or labor.

If a clinician has prescribed a real hypnotic, anxiolytic, or GI work-up, chamomile is not a substitute and should be mentioned as a sedating or allergenic herb, not hidden as “just tea.”

The practical stacking risk is sedation. Combining chamomile with benzodiazepines, Z-drugs, alcohol, or other calming herbs (valerian, hops, kava) can add drowsiness. That is common sense, not a well-mapped pharmacokinetic table.

Coumarin-containing plants are often listed with warfarin. Chamomile’s coumarin content is modest compared with sweet clover, but MedlinePlus still flags a possible additive bleeding concern with anticoagulants. Tell the prescriber; do not “thin the blood naturally” on purpose.

Cyclosporine and some other narrow-therapeutic-index drugs have scattered interaction notes with chamomile in secondary sources; the evidence is not goldenseal-level CYP inhibition. The conservative rule is: if the medicine is unforgiving, mention the tea.

Do not combine tea, capsules, and essential oil to “get more chamomile.” Duplicate exposure is how people discover they are allergic.