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Vitex

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Vitex

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Also indexed as: Agnus Castus, Chaste Tree, Chasteberry, Monk’s Pepper, Vitex agnus castus
Vitex: Main Image© Steven Foster
Common names:
Agnus Castus, Chaste Tree, Chasteberry, Monk’s Pepper
Botanical names:
Vitex agnus castus

How It Works

Vitex contains several different constituents, including flavonoids, iridoid glycosides, and terpenoids. The whole fruit extract, rather than one of its individual constituents, appears to be necessary for the medicinal activity of vitex. Vitex does not contain hormones. The benefits of vitex stem from its actions upon the pituitary gland—specifically on the production of a hormone called luteinizing hormone (LH). This indirectly increases progesterone production and helps regulate the menstrual cycle. Vitex also keeps prolactin secretion in check. The ability to decrease mildly elevated prolactin levels may benefit some infertile women as well as some women with breast tenderness associated with premenstrual syndrome (PMS).

A controlled clinical trial found that women taking 20 mg per day of a concentrated vitex extract for three menstrual cycles had a significant reduction in symptoms of PMS, including irritability, mood swings, headache, and breast tenderness. Another double-blind trial found that women taking vitex had slightly greater relief from symptoms of PMS, including breast tenderness, cramping, and headaches, than those taking vitamin B6. These trials support the findings of preliminary vitex trials for women with PMS. Vitex (32.4 mg per day), in combination with some homeopathic remedies, has also been found in a double-blind trial to successfully treat breast tenderness (also called mastalgia).

A review of other trials and case reports suggests there is at least preliminary support that vitex should be considered for women with irregular periods, infertility, and mildly elevated prolactin levels. Double-blind trials have confirmed the effectiveness of vitex at lowering mildly elevated prolactin levels in women. According to one small trial, acne associated with PMS, may also be reduced using vitex.

How to Use It

Caution: Agnus castus should not be taken during pregnancy. The German Commission E monograph recommends a daily intake—30–40 mg of the dried herb—in capsules or in liquid preparations. Vitex is typically taken once in the morning with liquid for several months consecutively.

With its emphasis on long-term balancing of a woman’s hormonal system, vitex is not a fast-acting herb and is unlikely to give immediate relief to the discomfort associated with PMS. For premenstrual syndrome, frequent or heavy periods, vitex can be used continuously for four to six months. Infertile women with amenorrhea (lack of menstruation) can remain on vitex for 12 to 18 months, unless pregnancy occurs during treatment.

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Vitex Benefits
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Copyright © 2011 Aisle7.

The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2013.

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