Herbs (Global Traditional) · Mediterranean
Chasteberry (Vitex agnus-castus)
Strong Evidencebotanical
Hermetica Superfood Encyclopedia
Chasteberry (Vitex agnus-castus) contains diterpenes and flavonoids that interact with dopamine D2 receptors in the pituitary gland, influencing prolactin secretion. This Mediterranean herb has been traditionally used for hormonal balance, though clinical evidence remains limited to preliminary studies.
Chasteberry (Vitex agnus-castus) is a shrub native to the Mediterranean region and western Asia, belonging to the Verbenaceae family, with fruits and leaves used medicinally. Extracts are derived from small drupes (berries) using methods including methanol extraction, vacuum liquid chromatography, and steam distillation for essential oils.
The current research dossier lacks human clinical trials, randomized controlled trials, or meta-analyses for chasteberry. Available evidence is limited to in vitro bioassays showing cholinesterase inhibition (IC50 786.16 μg/mL for AChE and 133.54 μg/mL for BChE) and chemical composition analyses.
No clinically studied dosage ranges are available from human trials. Standardization protocols for extracts have not been established in the provided research. Consult a healthcare provider before starting any new supplement.
Chasteberry's primary bioactive compounds, including diterpenes like rotundifuran and clerodadienols, act as selective dopamine D2 receptor agonists in the anterior pituitary. This dopaminergic activity inhibits prolactin secretion while potentially modulating luteinizing hormone release. The herb's flavonoids, particularly casticin and vitexin, contribute additional antioxidant effects through free radical scavenging mechanisms.
Most research on chasteberry consists of small-scale studies and traditional use reports rather than large randomized controlled trials. In vitro studies have demonstrated cholinesterase inhibition activity, but this has not been validated in human clinical trials. Chemical analyses confirm high concentrations of antioxidant compounds including flavonoids and phenolic acids, though clinical outcomes related to oxidative stress have not been systematically studied. The evidence base remains preliminary and requires larger, well-designed human studies for definitive health claims.
Chasteberry is generally well-tolerated but may cause gastrointestinal upset, headaches, or skin reactions in some individuals. The herb can interact with hormonal medications, including birth control pills and hormone replacement therapy, potentially reducing their effectiveness. It may also interact with dopamine agonists and antagonists used for Parkinson's disease or psychiatric conditions. Pregnant and breastfeeding women should avoid chasteberry due to its hormonal effects and lack of safety data in these populations.
