Rosemary (Rosmarinus officinalis) is widely used as a culinary herb, especially in Mediterranean dishes, and is also used as a fragrant additive in soaps and other cosmetics. Traditionally, rosemary has been used by herbalists to improve memory, relieve muscle pain and spasm, stimulate hair growth, and support the circulatory and nervous systems. It is also believed to affect the menstrual cycle, act as an abortifacient (inducing miscarriage), relieve menstrual cramps, increase urine flow, and reduce kidney pain (for example, from kidney stones). Recently, rosemary has been the object of laboratory and animal studies investigating its potential in the prevention of cancer and its antibacterial properties.

Native to the Mediterranean area, rosemary is now cultivated widely in other parts of the world, although it thrives in a warm and relatively dry climate. The plant takes its name from rosmarinus, a Latin term meaning "sea dew." It is an erect evergreen shrub that can grow to a height of six and a half feet. The woody rootstock bears rigid branches with fissured bark. The long, linear, needle-like leaves are dark green above and white beneath. Both the fresh and dried leaves are pungent. The small flowers are pale blue. The leaves and parts of the flowers contain volatile oil.

The leaves and twigs of the rosemary plant are used for culinary and medicinal purposes.

Food Preservation
Most evidence for rosemary's medicinal uses comes from clinical experience rather than from scientific studies. However, recent laboratory studies have shown that rosemary slows the growth of a number of bacteria such as E. coli and S. aureus that are involved in food spoilage, and may actually perform better than some commercially used food preservatives.

Alopecia
As stated above, one traditional use of rosemary has been to try to stimulate hair growth. In one study of 86 people with alopecia areata (a disease of unknown cause characterized by significant hair loss, generally in patches), those who massaged their scalps with rosemary and other essential oils (including lavender, thyme, and cedarwood) every day for 7 months experienced significant hair re-growth compared to those who massaged their scalps without the essential oils. It is not entirely clear from this study whether rosemary (or a combination of rosemary and the other essential oils) was responsible for the beneficial effects.

Cancer
Both laboratory and animal studies suggest that rosemary's antioxidant properties may have activity against colon, breast, stomach, lung, and skin cancer cells. Much more research in this area, including trials involving people, must be conducted before conclusions can be drawn about the value of rosemary for cancer.

• Dried whole herb
• Dried, powdered extract (in capsules)
• Preparations derived from fresh or dried leaves, such as tinctures, infusions, liquid extract, and rosemary wine
• Volatile oil (to be used externally, not to be ingested)

Pediatric

There are no known scientific reports on the medicinal use of rosemary in children. Therefore, it is not currently recommended for this age group.

Adult

Listed below are the recommended adult doses for rosemary. (Total daily intake should not exceed 4 to 6 grams of the dried herb.):

• Tea: 3 cups daily. Prepare using the infusion method of pouring boiling water over the herb and then steeping for 3 to 5 minutes. Use 6 g powdered herb to 2 cups water. Divide into three small cups and drink over the course of the day.
• Tincture (1:5): 2 to 4 mL three times per day
• Fluid extract (1:1 in 45% alcohol): 1 to 2 mL three times per day
• Rosemary wine: add 20 g herb to 1 liter of wine and allow to stand for five days, shaking occasionally

Externally, rosemary may be used as follows:

• Essential oil (6 to 10%): 2 drops semisolid or liquid in 1 tablespoon base oil
• Decoction (for bath): Place 50 g herb in 1 liter water, boil, then let stand for 30 minutes. Add to bath water.

The use of herbs is a time-honored approach to strengthening the body and treating disease. Herbs, however, contain active substances that can trigger side effects and interact with other herbs, supplements, or medications. For these reasons, herbs should be taken with care, under the supervision of a practitioner knowledgeable in the field of botanical medicine.

Rosemary is generally considered safe when taken in recommended doses. However, there have been occasional reports of allergic reactions. Large quantities of rosemary leaves, because of their volatile oil content, can cause serious side effects, including vomiting, spasms, coma and, in some cases, pulmonary edema (fluid in the lungs).

Those who are pregnant or breastfeeding should not use rosemary in quantities larger than those normally used in cooking. An overdose of rosemary may induce a miscarriage or cause damage to the fetus.

Rosemary oil, taken orally, can trigger convulsions and should not be used internally. Topical preparations containing rosemary oil are potentially harmful to hypersensitive people who may be allergic to camphor.

Doxorubicin
In a laboratory study, rosemary extract increased the effectiveness of doxorubicin in treating human breast cancer cells. Human studies will be necessary to determine whether this is true in people. Meanwhile, those taking doxorubicin should consult with a healthcare practitioner before taking rosemary.

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