Chaste Tree Berry for Fertility Support

Research suggests that chaste tree berry and related Vitex species may influence reproductive hormone levels, with the most clinically relevant proposed mechanism being the activation of dopamine receptors in the pituitary gland to reduce elevated prolactin, a hormonal state associated with fertility difficulties in women. The available evidence includes a 2023 narrative review finding preliminary support for this prolactin-lowering effect in mild cases, an observational wildlife study noting significant progesterone elevations in female chimpanzees consuming a related Vitex species, and a rat study indicating that another Vitex species extract can negatively affect male reproductive parameters at certain doses. Studies indicate that the overall picture is mixed and species-dependent, with the human-focused review explicitly noting that existing clinical studies are too small and inconsistent to support firm conclusions, and that the animal and wildlife findings, while suggestive of real hormonal activity, cannot be directly translated to human fertility outcomes. The current body of evidence does not yet include large, well-controlled human clinical trials sufficient to establish whether chaste tree berry reliably supports or harms fertility, and researchers across these studies consistently call for more rigorous investigation before drawing definitive conclusions.