Chasteberry is frequently called by its Latin names: vitex or, alternatively, agnus-castus. A shrub in the verbena family, chasteberry is commonly found on riverbanks and nearby foothills in central Asia and around the Mediterranean Sea. After its violet flowers have bloomed, a dark brown, peppercorn-size fruit with a pleasant odor reminiscent of peppermint develops. This fruit is used medicinally.
As the name implies, for centuries chasteberry was thought to counter sexual desire. A drink prepared from the plant's seeds was used by the Romans to diminish libido, and in ancient Greece, young women celebrating the festival of Demeter wore chasteberry blossoms to show that they were remaining chaste in honor of the goddess. Monks in the Middle Ages used the fruit for similar purposes, yielding the common name "monk's pepper."
What Is Chasteberry Used for Today?
The modern use of chasteberry dates back to the 1950s, when the German pharmaceutical firm Madaus Company first produced a standardized extract. This herb has become a standard European treatment for cyclic breast tenderness, a condition related to PMS that is sometimes called cyclic mastitis, cyclic mastalgia
Chasteberry is believed to work by suppressing the release of prolactin from the pituitary gland.
Elevated prolactin levels can also cause a woman's period to become irregular and even stop. For this reason, chasteberry is sometimes tried when menstruation is irregular, or stops altogether (
High prolactin levels can also cause
What Is the Scientific Evidence for Chasteberry?
There is a growing body of scientific research supporting the use of chasteberry.
A double-blind, placebo-controlled trial of 97 women with symptoms of cyclic mastalgia
However, something interesting happened in the third cycle. The benefits of chasteberry treatment reached a plateau, while the placebo group continued to improve. At the end of the third cycle, those receiving chasteberry were still doing better, but the difference was no longer statistically significant.
Another double-blind trial of 104 women compared placebo against two forms of chasteberry (liquid and tablet) for at least three menstrual cycles.
Benefits were also seen in a double-blind trial that enrolled 160 women with cyclic breast pain. The women were given either chasteberry, a drug related to progesterone, or placebo, and were followed for at least four menstrual cycles.
Premenstrual Syndrome (PMS)
A double-blind, placebo-controlled study of 178 women found that treatment with chasteberry over three menstrual cycles significantly reduced general
Unfortunately, there is little corroborating evidence as yet for this one well-designed study. A previous double-blind trial compared chasteberry to
Two other studies are often cited in support of chasteberry as a treatment for PMS. These were rather informal reports of a total of about 3,000 women with PMS given chasteberry by their physicians.
One double-blind trial followed 52 women with a form of irregular menstruation known as
luteal phase defect
The typical dose of dry chasteberry extract is 20 mg taken 1 to 3 times daily. Chasteberry is also sold as a liquid extract to be taken at a dosage of 40 drops each morning. However, extracts that require lower or higher dosing are also available. We recommend following the label instructions.
There haven't been any detailed studies of the safety of chasteberry. However, its widespread use in Germany has not led to any reports of significant adverse effects,
other than a single case of excessive ovarian stimulation possibly caused by chasteberry.
Because it lowers prolactin levels, chasteberry is not an appropriate treatment for pregnant or nursing women. Safety in young children or those with severe liver or kidney disease has not been established.
There are no known drug interactions associated with chasteberry. However, it is quite conceivable that the herb could interfere with hormones or medications that affect the pituitary gland.
Interactions You Should Know About
If you are taking hormones or drugs that affect the pituitary, such as bromocriptine
1. Milewicz A, Gejdel E, Sworen H, et al. Vitex agnuscastus extract in the treatment of luteal phase defects due to latent hyperprolactinemia. Results of a randomized placebo-controlled double-blind study [translated from German]. Arzneimittelforschung . 1993;43:752-756.
2. Jarry H, Leonhardt S, Gorkow C, et al. In vitro prolactin but not LH and FSH release is inhibited by compounds in extracts of Agnus castus : direct evidence for a dopaminergic principle by the dopamine receptor assay. Exp Clin Endocrinol . 1994;102:448-454.
7. Bergmann J, Luft B, Boehmann S, et al. The effectiveness of the complex agent, Phyto-Hypophyson L, in female sterility of hormonal origin [translated from German]. Forsch Komplementarmed Klass Naturheilkd. 2000;7:190-199.
8. Halaska M, Beles P, Gorkow C, et al. Treatment of cyclical mastalgia with a solution containing a Vitex agnus castus extract: results of a placebo-controlled double-blind study. Breast . 1999;8:175-181.
9. Wuttke W, Splitt G, Gorkow C, et al. Treatment of cyclical mastalgia: results of a randomised, placebo-controlled, double-blind study [translated from German]. Geburtsh Frauenheilk . 1997;57:569-574.
16. Milewicz A, Gejdel E, Sworen H, et al. Vitex agnuscastus extract in the treatment of luteal phase defects due to latent hyperprolactinemia. Results of a randomized placebo-controlled double-blind study [translated from German]. Arzneimittelforschung . 1993;43:752-756.
Last reviewed April 2009 by EBSCO CAM Review Board
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