From the Manufacturer:
We prepare our Chaste Tree extract from the berries of Vitex agnus-castus trees which are Custom Wildcrafted™ especially for us in their wild native habitat in the Atlas Mountains of Morocco.
To assure optimal extraction of Chaste Tree's bioactive compounds, the berries are hand-harvested only after they have fully ripened, are carefully shade-dried, and are then shipped directly to our laboratory and thoroughly extracted.