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Rosemary (Old Man, Rosmarinus officinalis Linn): Dosing and Uses

 

Classes: Antimicrobials, Herbals; Oncology, Herbals

Medically reviewed by Min Clinic Staff | Updated: January 2026

Suggested dosing of Rosemary (Old Man, Rosmarinus officinalis Linn)

 

Rosemary Leaf (Dyspepsia, High BP, & Rheumatism)

1-2 g/day

as tea: 1-3 cups/d (steep 1-2g in 150 mL water)

 

Extract

2-4 mL PO TID (1:1 in 45% alcohol)

 

Topical

Essential Oil: doses up to 0.1-1 mL (6-10% essential oil), massage scalp for 2 minutes

 

Suggested uses of Rosemary (Old Man, Rosmarinus officinalis Linn)

Bronchial asthma, peptic ulcer, prostate d/o, inflammatory disease, liver toxicity, atherosclerosis, stroke, ischemic heart disease, cataract, leukemia, sperm motility

Anticancer & antitumor activity

Enhances mental function & memory

Dyspepsia, high BP, & rheumatism

Promotes menstrual flow

Antibacterial, antifungal, & antiviral agent

 

Efficacy

Approved for dyspepsia, hypertension, alopecia & rheumatism by German Commission e

 

Rosemary (Old Man, Rosmarinus officinalis Linn) adverse (side) effects

Frequency not defined

Ingestion of large amounts can result in stomach & intestinal irritation & kidney damage

Seizures

Toxicity

Coma

Vomiting

Pulmonary edema

Emmenagogue & abortifacient

 

Warnings

Contraindications

Pregnancy (permissible as food)

 

Cautions

Ingestion of large quantities: stomach & intestinal irritation, kidney damage, toxicity

Risk of autoimmune dz

Allergic contact dermatitis, although not generally considered to be a human sensitizer

Convulsant/epileptogenic properties: may cause seizures

 

Pregnancy and lactation

Pregnancy category: avoid dosages above those found in food b/c safety & efficacy unknown

Lactation: N/A

 

Pregnancy categories

A: Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.

B: May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk.

C: Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done.

D: Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk.

X: Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist.

NA: Information not available.

 

Pharmacology of Rosemary (Old Man, Rosmarinus officinalis Linn)

Metabolism: N/A

Excretion: N/A

 

Mechanism of action

AntimicrobiaL