Bottom Line: Clinical trials show that chasteberry helps improve PMS and menstrual disturbances, but it is not known if the hormones in this herb are safe to take for long periods of time. There is no proof that it relieves the symptoms of menopause.
Chasteberry is a fruit extract. Laboratory analysis has shown that chasteberry contains active hormones that are also produced by the human body, such as progesterone, testosterone, and androstenedione. In studies in both laboratory animals and humans, chasteberry has been found to alter the release of gonaditropins (hormones that stimulate secretion of sex hormones from the ovaries and testes) from the pituitary gland in the brain. It is hypothesized that this has a downstream effect on the release of sex hormones (estrogen, progesterone, and testosterone) within the body, but scientists are unsure exactly how chasteberry works.
To ease difficult and painful menstruation A handful of clinical trials support this use in women aged 20-40 whose ovarian function is not greatly impaired and who have no other hormone imbalances.
To treat breast pain A few clinical trials support this use for breast pain associated with menstruation.
To prevent menopausal symptoms such as hot flashes, vaginal dryness, sleep disturbances, and mood disorders There is no proof from clinical trials that chasteberry can treat menopausal symptoms. Because chasteberry contains sex hormones like progesterone, it is not known whether it would be a safe alternative to hormone replacement therapy.
To prevent premenstrual symptoms such as depression, bloating, anxiety, breast tenderness, and headaches A handful of clinical trials support this use in women aged 20-40 whose ovarian function is not greatly impaired and who have no other hormone imbalances.
To prevent dysfunctional uterine bleeding A handful of clinical trials support this use in women aged 20-40 whose ovarian function is not greatly impaired and who have no other hormone imbalances.
Premenstrual syndrome (PMS): A randomized controlled trial studied whether chasteberry could relieve premenstrual symptoms in 178 women. For three menstrual cycles, 86 women took one chasteberry extract tablet three times daily, while 84 women took three placebo pills daily. Compared to women taking the placebo, women taking chasteberry reported significant reductions in PMS symptoms, including depression, headache, irritability, and breast tenderness. 24% of the placebo group and 52% of the chasteberry group reported such improvements.
Researchers followed 1,634 female German patients who were taking a chasteberry extract to treat premenstrual symptoms. After three months of taking the extract, 93% of patients reported a decrease in the number of symptoms, including depression, anxiety, craving, and bloating. Some women reported an end of PMS complaints altogether. However, this study lacks a control group (a group taking a placebo pill) to which the researchers could compare their results with chasteberry. About 1% of women had side effects, including itching, rash, eczema, hair loss, and gastrointestinal complaints.
Menstrual disturbances related to corpus luteum insufficiency or ovarian dysfunction: A group of 1,571 women with menstrual disturbances related to corpus luteum insufficiency or ovarian dysfunction were followed to study the effects of a chasteberry extract on their symptoms. The women took 40 drops of the extract (Agnolyt®) daily for an average of 135 days. 90% of the women reported an improvement of symptoms, while about 2% reported side effects such as gastrointestinal upset, nausea, diarrhea and malaise. Like the previous study, this study lacks a control group (a group taking a placebo pill) to which the researchers could compare their results with chasteberry.
Chasteberry contains sex hormones such as progesterone. Therefore, it is not yet known whether chasteberry is a safe alternative to hormone replacement therapy.
This product is regulated by the F.D.A. as a dietary supplement. Unlike approved drugs, supplements are not required to be manufactured under specific standardized conditions. This product may not contain the labeled amount or may be contaminated. In addition, it may not have been tested for safety or effectiveness.
Derived from the fruit of the tree. This herb contains steroidal precursors and active moieties including progesterone, testosterone, and androstenedione. Several clinical studies in women suggest efficacy in reducing symptoms associated with PMS (8)(9). Chasteberry may interact with oral contraceptives, other hormonal therapy, and dopamine antagonists (such as haloperidol and prochlorperazine) (5). Chasteberry may have estrogenic activity (11)(12) and should be avoided or used cautiously by patients with hormone-sensitive disease. Adverse effects reported include nausea, rash, headache, and agitation (3)(4).
In animal studies, chasteberry has been reported to diminish release of follicle-stimulating hormone from the anterior pituitary while increasing the release of luteinizing hormone and prolactin. It also contains constituents that bind to dopamine (d1 and d2) receptors and seem to inhibit prolactin release (2). In vitro studies, constituents isolated from chasteberry can stimulate estrogen receptors (11)(12). In human studies, it has been found to restore progesterone concentrations, prolong the hyperthermic phase in the basal temperature curve, and restore the LH-RH test to normal. It is thought to act on the pituitary-hypothalamic axis rather than directly on the ovaries(6)(8).
Oral Contraceptives: Chasteberry may interfere with efficacy due to its hormone-regulating activity. Dopamine D2-Antagonists: Chasteberry may interfere with the action of drugs that antagonize dopamine receptors (e.g. chlorpromazine, haloperidol, prochlorperazine). (5)
Loch EG, Selle H, Boblitz N. Treatment of premenstrual syndrome with a phytopharmaceutical formulation containing vitex agnus castus. J Womens Health Gend Based Med 2000;9:315-20. A non-interventional review of 1,634 female German patients suffering from PMS who were treated with a vitex preparation. Questionnaires, completed by the physician at baseline and after three menstrual cycles, evaluated the symptoms of PMS and efficacy of herbal supplement. Results indicate that a reduction in PMS symptoms including depression, anxiety, bloating, and headache occurred. Reported adverse events included 13 cases of skin symptoms (pruritus, rash, eczema, hair loss) and 6 reports of mild gastrointestinal complaints (nausea, vomiting, diarrhea, stomach pain).
Feldman HU, et al. The treatment of corpus luteum insufficiency and premenstrual syndrome. Experience in a multi-center study under clinical practice conditions. Gyne 1990;12:422-5. A group of 1,571 women with menstrual disturbances related to corpus luteum insufficiency or ovarian dysfunction were studied. Treatment averaged 135 days with an average dose of 40 drops of Agnolyt (extract of vitex) taken on an empty stomach. The response rate was 90%. Adverse effects of gastrointestinal upset, nausea, diarrhea and malaise were seen in 1.9% of women.
Feldman HU, et al. The treatment of corpus luteum insufficiency and premenstrual syndrome. Experience in a multi-center study under clinical practice conditions. Gyne 1990;12:422-5.
