Rosemary (Salvia rosmarinus): Benefits, Dosage, Safety & Evidence

Questions fréquentes

How does rosemary improve memory and cognitive function?

Rosemary improves cognitive function primarily through its volatile compound 1,8-cineole, which inhibits acetylcholinesterase, the enzyme responsible for breaking down acetylcholine (Evidence Level B). By preserving acetylcholine levels, rosemary supports neurotransmission essential for learning and memory. Additionally, its antioxidant compounds, carnosic acid and rosmarinic acid, protect neurons from oxidative stress. Research suggests that even the aroma of rosemary essential oil can enhance cognitive performance, supporting its traditional reputation as a memory tonic.

Does rosemary interact with blood thinners or other medications?

Yes, rosemary can interact with anticoagulant and antiplatelet medications such as warfarin, aspirin, and clopidogrel (Evidence Level D). Rosemary impairs platelet aggregation, which may increase the risk of bleeding when combined with these drugs. It may also interact with diabetes medications by lowering blood sugar levels, potentially causing hypoglycemia. Additionally, rosemary affects cytochrome P450 liver enzymes, which could alter the metabolism of various prescription drugs. Patients taking these medications should consult a healthcare provider before use.

What is the recommended daily dosage for rosemary supplements?

The standard adult dosage for rosemary is 1-2 grams of dried herb prepared as a tea, taken three times daily (Evidence Level Traditional). For standardized extracts, a dose of 200-350 mg daily is commonly recommended. These dosages are based on traditional use and pharmacological studies rather than large-scale clinical trials. Users should start with lower doses to assess tolerance, as high doses can cause gastrointestinal irritation. Essential oil dosages differ significantly and should only be used under professional guidance due to toxicity risks.

Is rosemary safe to take during pregnancy and breastfeeding?

Rosemary is considered unsafe during pregnancy when taken in medicinal doses (Evidence Level D). High therapeutic amounts may stimulate uterine contractions or menstrual flow, potentially increasing the risk of miscarriage. While culinary amounts used for seasoning food are generally considered safe, pregnant women should avoid concentrated supplements and rosemary essential oil. Due to insufficient safety data, breastfeeding women are also advised to avoid medicinal doses. Always consult a qualified healthcare provider before using herbal supplements during pregnancy.

Can rosemary cause seizures or other serious side effects?

Yes, high doses of rosemary, particularly the essential oil, can induce seizures due to the presence of camphor, which is neurotoxic in large amounts (Evidence Level D). Individuals with seizure disorders or epilepsy should strictly avoid rosemary essential oil and high-dose supplements. Other potential side effects include gastrointestinal irritation, allergic reactions, and contact dermatitis. Large doses may also raise blood pressure, making it contraindicated for individuals with hypertension. Adverse effects are rare at normal culinary or recommended supplemental doses.

Fiche d'information compilée à partir de PubMed

Cette fiche a été compilée à partir de résumés PubMed (NIH) avec l'assistance d'une IA. Chaque affirmation factuelle est citée par un article PubMed réel (voir la liste des sources). Elle n'a pas encore été révisée par un humain — confirmez auprès d'un professionnel de santé avant utilisation.

Compilé à partir de 30 articles PubMed · modèle : gemma4:31b

Résumé

Rosemary (Salvia rosmarinus) is a medicinal plant native to the Mediterranean region used for therapeutic, culinary, and preservative purposes [PMID:30621719, 38284599]. It exhibits a wide range of pharmacological activities, including antioxidant, anti-inflammatory, and neuroprotective effects [PMID:30621719, 39096378].

Contexte

Rosemary (Rosmarinus officinalis L. or Salvia rosmarinus) is an evergreen bushy shrub belonging to the Lamiaceae family, primarily growing along the Mediterranean Sea and sub-Himalayan areas [PMID:32963731, 32455585].

Usages traditionnels

In folk medicine, it has been used as an antispasmodic, mild analgesic, circulatory tonic, and to treat intercostal neuralgia, headaches, migraine, insomnia, emotional upset, depression, and memory dysfunction [PMID:32963731, 32086980].

Composés actifs

Bioactive constituents include phenolic compounds, alkaloids, saponins, tannins, flavonoids, and essential oils [PMID:39096378, 30181448]. Key active compounds include rosmarinic acid, carnosic acid, carnosol, and ursolic acid [PMID:40783038, 27869665, 32455585].

Mécanisme d'action

Rosemary acts through several mechanisms: inhibition of oxidative stress and inflammatory mediators (such as TNF-α, IL-6, and IL-17) [PMID:33044022]; inhibition of cholinesterase and modulation of dopaminergic and oxytocinergic systems [PMID:38258779]; and activation of KCNQ3/KCNQ5 voltage-gated potassium channels via carnosic acid [PMID:39153478]. Antitumor effects are linked to antiangiogenic properties, epigenetic actions, and increased expression of onco-suppressor genes [PMID:32532056].

Preuves cliniques

Preuve BCognitive and Psychological Health (University Students)

Oral administration of 500 mg rosemary twice daily for one month significantly improved prospective and retrospective memory, reduced anxiety and depression, and improved sleep quality (excluding sleep latency and duration) [PMID:29389474]

Preuve BAlopecia

Rosemary oil is used to enhance circulation and extend the anagen phase to promote hair growth and scalp health [PMID:40656290]; standardized extracts have been tested for efficacy in testosterone-induced alopecia in rat models [PMID:40632089]

Preuve CNeurological Disorders

Shows potential in treating Alzheimer's disease, Parkinson's disease, migraine, and cognitive disorders through neuroprotective and anti-apoptotic effects [PMID:35873824, 40055645]

Preuve CMetabolic Syndrome

Active constituents like rosmarinic and carnosic acid are explored for managing obesity, insulin resistance, hypertension, and dyslipidemia [PMID:40783038]

Preuve CCancer

Preclinical evidence suggests anticancer potential, particularly in colorectal cancer, through the modulation of signaling pathways and apoptosis [PMID:21955093, 32532056]

Sécurité et effets indésirables

Generally considered safe for consumption and topical use, but allergic reactions and contact dermatitis have been reported [PMID:39096378, 23827646]. High doses may cause atrophic and degenerative changes in the liver and kidney, increasing blood urea nitrogen (BUN) and aspartate aminotransferase (AST) while reducing total serum protein [PMID:39096378].

Posologie et administration

In one clinical trial, 500 mg was administered orally twice daily for one month [PMID:29389474]. No PubMed data available for general guidelines. Consult a healthcare provider.

Synthèse des preuves

The evidence consists primarily of preclinical reviews and in vitro/in vivo studies (Level C/D), with limited randomized controlled trials (Level B) supporting benefits for memory, anxiety, and hair growth.

Sources PubMed

1.PMID: 30621719 (2019) — Rosmarinus officinalis L. (rosemary) as therapeutic and prophylactic agent. · Journal of biomedical science
2.PMID: 39096378 (2025) — Toxicity and safety of rosemary (Rosmarinus officinalis): a comprehensive review. · Naunyn-Schmiedeberg's archives of pharmacology
3.PMID: 32963731 (2020) — Therapeutic effects of rosemary (Rosmarinus officinalis L.) and its active constituents on nervous system disorders. · Iranian journal of basic medical sciences
4.PMID: 29389474 (2018) — 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
5.PMID: 40055645 (2025) — Network pharmacology mechanism of Rosmarinus officinalis L.(Rosemary) to improve cell viability and reduces apoptosis in treating Alzheimer's disease.

Rosemary

Sources et citations

Calculer une dose sûre de Rosemary

Mexican Sage

Kashmiri Saffron

White Sage

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Posologie et administration

Synthèse des preuves

Sources PubMed

Sources gouvernementales

Rosemary

Sources et citations

Calculer une dose sûre de Rosemary

Plantes associées

Mexican Sage

Kashmiri Saffron

White Sage

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Posologie et administration

Synthèse des preuves

Sources PubMed

Sources gouvernementales