Herbs (Global Traditional) · European
Chaste Tree (Vitex agnus-castus)
Strong Evidencebotanical
Hermetica Superfood Encyclopedia
Chaste tree (Vitex agnus-castus) contains diterpenes and flavonoids that modulate dopamine receptors, helping regulate prolactin and reproductive hormones. Clinical evidence supports its effectiveness for reducing PMS symptoms and cyclic breast pain.
Vitex agnus-castus L., commonly known as chaste tree or chasteberry, is a flowering shrub native to the Mediterranean region and Central Asia, belonging to the Lamiaceae family. The herb is extracted from the fruit (berries) of the plant through standardized extraction methods that concentrate bioactive compounds into liquid or solid preparations. It is classified as a phytotherapeutic agent used predominantly in European and Anglo-American herbal medicine for female reproductive health conditions.
A meta-analysis following PRISMA guidelines examined Vitex products versus placebo for PMS, while a systematic review of 25 studies (17 RCTs) confirmed efficacy for cyclic mastalgia with a conservative meta-analysis of 718 participants. Large real-world effectiveness studies (PMID: 38393671) involving Cyclodynon® and Mastodynon® products showed 85.2% of dysmenorrhea patients experienced improvement over three months, with additional RCTs demonstrating efficacy for hyperprolactinemia (PMID: 8369008) and sexual dysfunction (PMID: 31464546).
Standardized extract: 20-40 mg daily, with treatment duration of approximately 3 months for optimal effects. Dried extract: 3.2-4.8 mg daily (as in Agnugol tablets). Single capsule preparations containing 20 mg Vitex agnus castus have been used in clinical studies. Consult a healthcare provider before starting any new supplement.
Chaste Tree (Vitex agnus-castus) is not consumed as a food for macronutrient value; its pharmacological relevance derives entirely from its bioactive phytochemical profile. **Key Bioactive Compounds:** • **Iridoid glycosides:** Agnuside (0.01–0.07% of dried fruit weight) and aucubin — agnuside is often used as a standardization marker, with quality extracts standardized to ≥0.5% agnuside. • **Diterpenes (clerodane-type):** Rotundifuran, vitexilactone, and 6β,7β-diacetoxy-13-hydroxy-labda-8,14-diene — these are key dopaminergic active constituents; vitexilactone binds dopamine D2 receptors at concentrations as low as 0.1–1 µM in vitro. • **Flavonoids:** Casticin (0.02–0.2% of dried fruit), penduletin, chrysosplenol-D, and vitexin. Casticin demonstrates anti-inflammatory and antiproliferative activity. • **Essential oils (0.5–1.8% of dried fruit):** 1,8-cineole (8–25%), sabinene (5–15%), α-pinene, β-caryophyllene, and limonene — composition varies by geographic origin. • **Phenolic acids:** p-Hydroxybenzoic acid, chlorogenic acid. • **Fatty acids in seed oil:** Linoleic acid, oleic acid, palmitic acid, and stearic acid present in seeds but not typically extracted in standard preparations. **Standardization of Commercial Extracts:** Most clinical trials use BNO 1095 or Ze 440 extracts standardized to contain specific ratios of casticin (≥0.6 mg per 20 mg extract in Ze 440) or agnuside. Typical extract ratios are 6–12:1 (drug:extract) using 60–70% ethanol. **Mineral/Vitamin Content:** Negligible at therapeutic doses (typically 20–40 mg extract/day or 30–40 mg dried fruit); trace amounts of potassium, calcium, iron, and zinc are present in whole fruit but are pharmacologically irrelevant at standard dosing. **Bioavailability Notes:** Oral bioavailability of key diterpenes and iridoids is moderate; agnuside undergoes hydrolysis in the GI tract, releasing the aglycone aucubigenin. Casticin has relatively low aqueous solubility, but ethanol-based extraction significantly improves its recovery. The lipophilic diterpene fraction responsible for dopaminergic activity is well-absorbed with concurrent dietary fat. No published human pharmacokinetic studies with full ADME data exist; most bioavailability data are extrapolated from in vitro permeability models and rodent studies.
Chaste tree's diterpenes (agnuside, casticin) and flavonoids bind to dopamine D2 receptors in the anterior pituitary, reducing prolactin secretion. This hormonal rebalancing increases progesterone relative to estrogen during the luteal phase. The extract also modulates opioid and GABA receptors, contributing to mood stabilization and pain reduction.
Seven of eight randomized controlled trials found chaste tree superior to placebo for PMS symptoms, with one Japanese study (n=128) showing significant improvements in irritability, mood, bloating, and fatigue. A meta-analysis of 6 studies (n=718) demonstrated moderate effect size for reducing cyclic breast pain. Most studies used standardized extracts providing 20-40mg daily for 3-6 months. Evidence quality is moderate to strong for these primary indications.
Common side effects include mild gastrointestinal upset, headache, and menstrual irregularities during initial weeks of use. Chaste tree may reduce effectiveness of hormonal contraceptives and hormone replacement therapy due to its hormonal activity. It can interact with dopamine agonists and antagonists used for Parkinson's disease and psychiatric conditions. Contraindicated during pregnancy and breastfeeding due to hormonal effects.
