Tea profileCaffeine-freeherbal teaLast updated November 1, 2026

What is rosemary tea good for?

Salvia rosmarinus (formerly Rosmarinus officinalis) leaves, fresh or dried

Salvia rosmarinus (formerly Rosmarinus officinalis) leaves, fresh or dried, the plant behind rosemary tea
Photo: Margalob, CC BY-SA 4.0, via Wikimedia Commons

Rosemary tea is good for three things: sharpening memory and focus, steadying mood and sleep, and settling digestion after a heavy meal. It is unusual among herbal teas in having small randomized trials of the dried leaf taken by mouth, and they point the same way: 500 to 750 mg of rosemary leaf improved memory in university students and older adults, while a much larger 6 g dose made memory worse. That dose-response is the single most useful fact about rosemary tea, because a strong cup sits near the lower, helpful end.

The hair claim is the one most people search for, and it rests on a different preparation. In 100 men with pattern hair loss, rosemary essential oil rubbed into the scalp for six months increased hair count about as much as 2% minoxidil, with less scalp itching. No trial has tested a rosemary tea rinse, so using cooled tea on the scalp is a cheap, harmless experiment rather than an evidence-based treatment.

Rosemary is safe in culinary and tea amounts, with sensible limits: large amounts can irritate the stomach, the leaf polyphenols cut iron absorption when drunk with meals, and it should not be taken in medicinal doses in pregnancy. Here is what the studies found, how to brew it so it tastes herbal rather than like pine resin, and who should limit it.

What rosemary tea is good for

  • Memory and focus — 750 mg dried rosemary leaf improved memory speed in 28 adults aged 75; 500 mg twice daily for a month improved memory in 68 students, while 6 g impaired it
  • Anxiety, mood and sleep — the same month-long student trial reduced anxiety and depression scores and improved sleep quality vs placebo
  • Hair growth — topical rosemary oil matched 2% minoxidil over 6 months in 100 men; no trial of a tea rinse
  • Digestion — approved by the German Commission E for indigestion and bloating on traditional grounds; no trials
  • Blood sugar and lipids — 2 to 10 g of leaf powder daily for 4 weeks lowered glucose and LDL in a small study of healthy adults
  • Antioxidant and anti-inflammatory — carnosic and rosmarinic acids are well studied in cells and animals

Rosemary tea benefits, graded by the evidence

Strong = multiple human trials or a meta-analysis. Moderate = a few small trials. Preliminary = early, traditional or animal data.

  1. Improves memory and focus

    Moderate evidence

    In a double-blind crossover trial, 28 older adults (mean age 75) took dried rosemary leaf powder at 750, 1500, 3000 and 6000 mg on separate days. The 750 mg dose, roughly what a strong cup of tea contains, significantly improved speed of memory compared with placebo, while 6000 mg impaired it. In 68 university students, 500 mg rosemary twice daily for one month improved prospective and retrospective memory scores versus placebo. Earlier aromatherapy work found the scent of rosemary improved memory quality, and blood levels of its compound 1,8-cineole tracked with performance.

    Key evidencePengelly et al., J Med Food 2012: 750 mg improved memory speed, 6 g impaired it, in 28 older adults

  2. Lowers anxiety and lifts mood

    Moderate evidence

    In the one-month student trial, 500 mg of rosemary twice daily significantly reduced anxiety and depression scores and improved sleep quality compared with placebo, alongside the memory gains. A small pilot in 22 healthy adults who drank rosemary tea daily for ten days found shifts in blood markers linked to anxiety and depression, including higher brain-derived neurotrophic factor, though symptoms were not the primary outcome. A clinical trial in 81 people in opioid withdrawal found rosemary reduced withdrawal symptoms and improved sleep. These are small studies, but they agree.

    Key evidenceNematolahi et al., Complement Ther Clin Pract 2018: 68-student RCT, 1 month

  3. Promotes hair growth (as topical oil)

    Moderate evidence

    One hundred men with androgenetic alopecia applied either rosemary essential oil or 2% minoxidil to the scalp daily for six months. Hair count increased significantly in both groups by month six with no difference between them, and scalp itching was more common with minoxidil. The mechanism is thought to involve improved scalp circulation and some inhibition of dihydrotestosterone at the follicle. This used concentrated oil, not tea; a cooled rosemary tea rinse contains far less of the active compounds and has not been tested.

    Key evidencePanahi et al., Skinmed 2015: rosemary oil vs minoxidil 2%, 100 men, 6 months

  4. Settles digestion

    Preliminary evidence

    Rosemary is a traditional remedy for indigestion, bloating and sluggish digestion after fatty meals, and the German Commission E approved the leaf for dyspeptic complaints on the strength of that tradition. Its oils stimulate bile flow and relax gut smooth muscle in animal studies, and rosemary extract protected the stomach lining against ulcer-causing agents in rats. There are no human trials, so a cup after a rich meal is tradition with a plausible mechanism.

  5. May improve blood sugar and cholesterol

    Preliminary evidence

    In a small study, 48 healthy adults took 2, 5 or 10 g of rosemary leaf powder daily for four weeks. Fasting glucose, total cholesterol, LDL and triglycerides fell and HDL rose in a dose-dependent way. Rosemary extracts and carnosic acid lower blood sugar and improve insulin sensitivity in diabetic animals. The human study was small and not placebo-controlled, and the lower doses used are in the range of two or three strong cups of tea.

    Key evidenceLabban et al., 2014: rosemary leaf powder 2 to 10 g daily, 48 adults, 4 weeks

  6. Antioxidant and anti-inflammatory activity

    Preliminary evidence

    Rosemary's carnosic acid, carnosol and rosmarinic acid are among the best-studied plant antioxidants, potent enough that rosemary extract is used as a food preservative. In cell and animal studies they reduce inflammatory cytokines, protect nerve cells and liver tissue, and slow the growth of some cancer cell lines. A cup of tea delivers meaningful rosmarinic acid but little carnosic acid, which is poorly water-soluble, and no human trial has linked the tea to reduced inflammation.

  7. Mild antimicrobial effect

    Preliminary evidence

    Rosemary oil and extracts inhibit a range of bacteria and fungi in culture, including Staphylococcus aureus, Escherichia coli and Candida albicans, and rosemary is used in some natural mouthwashes for that reason. Whether the much weaker tea has any effect in the mouth or gut has not been tested, so this is laboratory interest rather than a reason to drink it.

Is rosemary tea good for you?

  • Yes, in moderation: one to two cups a day of rosemary tea is safe for most adults, and the dose it delivers sits in the range that improved memory and mood in small trials, not the high dose that impaired it.
  • Treat the hair benefit as a topical-oil result; a cooled tea rinse is harmless to try but untested.
  • Drink it between meals rather than with them if you are anemic or vegetarian, since rosemary polyphenols reduce absorption of non-heme iron.
  • Limit it if you take blood thinners, ACE inhibitors, diuretics or lithium, or if you have epilepsy, since high doses of rosemary oil contain camphor and have triggered seizures.
  • Keep it to culinary amounts in pregnancy; medicinal doses were used traditionally to bring on periods and affected implantation in rats.

How to brew rosemary tea

Amount

1 teaspoon (1 to 2 g) dried rosemary, or one 3-inch fresh sprig, per 8 oz (240 ml)

Water

200°F / 93°C, a minute off the boil

Steep

5 minutes, covered; longer turns it resinous and bitter

  • Fresh sprigs make a cleaner, less bitter cup than dried; bruise the needles first to release the oils.
  • A slice of lemon and a little honey balance the pine notes, and it blends well with peppermint or green tea.
  • Breathe in the steam while it steeps; the 1,8-cineole aroma is part of the alerting effect in the memory studies.

How much per day

One to two cups a day, ideally in the morning or after lunch because of its mildly alerting aroma. That gives roughly 1 to 3 g of leaf, within the 500 to 750 mg doses that helped memory and well below the 6 g that impaired it or the amounts that caused stomach upset.

Caffeine-free, though its aroma compound 1,8-cineole is mildly alerting. Piney and resinous; brew it light.

Side effects, interactions and who should limit it

Side effects

  • Stomach upset, nausea or vomiting with strong brews or large amounts
  • Reduced absorption of non-heme iron when drunk with meals
  • Allergic skin reactions in people sensitized to rosemary, usually from topical products
  • Seizures reported with rosemary essential oil in high doses; never drink the oil
  • Possible increased sun sensitivity with heavy use

Interactions

  • Anticoagulants and antiplatelets (warfarin, aspirin, clopidogrel): rosemary has antiplatelet activity in laboratory studies
  • ACE inhibitors and other blood pressure drugs: possible additive lowering
  • Diuretics and lithium: rosemary's mild diuretic effect could raise lithium levels
  • Diabetes medication: possible additive blood-sugar lowering with several cups a day
  • Iron supplements: separate by 2 hours
  • Drugs metabolized by CYP1A2, 2B and 3A: rosemary extract altered these enzymes in animals; relevant only at high intakes

Pregnancy and breastfeeding

Rosemary as a seasoning is fine in pregnancy, but regular rosemary tea or supplements are not advised: it was used traditionally to stimulate menstruation and a rat study found reduced implantation with high-dose extract. There is no safety data for breastfeeding, so keep it to the occasional cup.

Frequently asked questions

Does rosemary tea help memory?

The small trials say yes at modest doses. In older adults, 750 mg of dried rosemary leaf improved memory speed, and in students 500 mg twice daily for a month improved memory scores, while a 6 g dose made memory worse. A strong cup of tea gives roughly 1 to 2 g of leaf, so one or two cups a day is in the helpful range; more is not better.

Is rosemary tea good for hair growth?

The hair evidence is for rosemary essential oil applied to the scalp, which matched 2% minoxidil over six months in 100 men. A cooled tea rinse contains much less of the active oils and has not been tested. It is harmless to try as a final rinse two or three times a week, and drinking the tea has no demonstrated effect on hair at all.

Can I drink rosemary tea every day?

Yes, one or two cups a day is safe for healthy adults. The dose-response in the memory trial is the reason to keep it moderate: 750 mg helped, 6 g hurt. Drink it between meals if you rely on plant sources of iron, and skip it if you are pregnant or take blood thinners without checking first.

Does rosemary tea have caffeine?

No. Rosemary is caffeine-free, but its aroma compound 1,8-cineole has a mildly alerting effect in studies, which is why it suits mornings better than bedtime for some people. Others find the tea relaxing, and the student trial found it improved sleep quality.

Is rosemary tea good for anxiety?

One month-long trial of 500 mg twice daily reduced anxiety and depression scores in 68 students, and a ten-day pilot of rosemary tea shifted blood markers linked to anxiety in a favorable direction. The effect is modest and the studies are small, but the direction is consistent. Lemon balm and lavender have more evidence if anxiety is the main goal.

Does rosemary tea lower blood pressure?

Rosemary has shown mild blood-pressure-lowering and diuretic effects in animals, and a few human reports suggest a small effect, but there is no controlled trial. If you take blood pressure medication, be aware that several strong cups could add to it; one cup a day is unlikely to matter.

Does rosemary tea interfere with iron?

Yes, modestly. In a controlled absorption study, adding rosemary extract to a meal reduced absorption of non-heme iron, the kind in plant foods, in the same way green tea does. Heme iron from meat is less affected. If you are anemic, vegetarian or pregnant, drink rosemary tea at least an hour away from iron-rich meals or supplements.

References

  1. Pengelly A, Snow J, Mills SY, Scholey A, Wesnes K, Butler LR. Short-term study on the effects of rosemary on cognitive function in an elderly population. Journal of Medicinal Food (2012)
  2. Nematolahi P, Mehrabani M, Karami-Mohajeri S, Dabaghzadeh F. Effects of Rosmarinus officinalis L. on memory performance, anxiety, depression, and sleep quality in university students: a randomized clinical trial. Complementary Therapies in Clinical Practice (2018)
  3. Panahi Y, Taghizadeh M, Marzony ET, Sahebkar A. Rosemary oil vs minoxidil 2% for the treatment of androgenetic alopecia: a randomized comparative trial. Skinmed (2015)
  4. Moss M, Oliver L. Plasma 1,8-cineole correlates with cognitive performance following exposure to rosemary essential oil aroma. Therapeutic Advances in Psychopharmacology (2012)
  5. Moss M, Cook J, Wesnes K, Duckett P. Aromas of rosemary and lavender essential oils differentially affect cognition and mood in healthy adults. International Journal of Neuroscience (2003)
  6. Achour M, Ben Salem I, Ferdousi F, et al.. Rosemary tea consumption alters peripheral anxiety and depression biomarkers: a pilot study in limited healthy volunteers. Journal of the American Nutrition Association (2022)
  7. Labban L, Mustafa UES, Ibrahim YM. The effects of rosemary (Rosmarinus officinalis) leaves powder on glucose level, total cholesterol, triglyceride, LDL and HDL in healthy adults. International Journal of Clinical Medicine (2014)
  8. Samman S, Sandstrom B, Toft MB, et al.. Green tea or rosemary extract added to foods reduces nonheme-iron absorption. American Journal of Clinical Nutrition (2001)
  9. Solhi H, Salehi B, Alimoradian A, et al.. Beneficial effects of Rosmarinus officinalis for treatment of opium withdrawal syndrome during addiction treatment programs: a clinical trial. Addiction and Health (2013)
  10. Lemonica IP, Damasceno DC, di-Stasi LC. Study of the embryotoxic effects of an extract of rosemary (Rosmarinus officinalis L.). Brazilian Journal of Medical and Biological Research (1996)
  11. Andrade JM, Faustino C, Garcia C, Ladeiras D, Reis CP, Rijo P. Rosmarinus officinalis L.: an update review of its phytochemistry and biological activity. Future Science OA (2018)

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This page 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.