Vitex (Chasteberry) for Fertility Support

Research suggests that Vitex agnus-castus may offer some support for fertility-related outcomes, though the evidence remains preliminary and inconsistent. The most directly relevant human evidence comes from a small randomized controlled trial using a multi-ingredient supplement containing chasteberry, which found improved hormonal markers and a higher pregnancy rate compared to placebo, though the combination formula makes it impossible to isolate chasteberry's specific contribution. Two reviews examining chasteberry more broadly found the strongest support for its use in premenstrual syndrome and cyclical breast pain, while evidence for fertility and menstrual regulation was characterized as weak or inconclusive; one review noted a plausible hormonal mechanism involving dopamine pathways and prolactin suppression, but concluded that available studies are too small and inconsistent to support firm recommendations. Several additional studies in the provided set involve unrelated plant species, insect biology, or animal models with limited relevance to human fertility, and readers should be aware that the overall body of human clinical evidence for chasteberry as a standalone fertility aid remains limited in both size and quality.