Authorized Vendor for Chaste Tree. Chaste Tree is now the subject of several clinical trials. Preliminary results are supporting traditional use. In Germany, Chaste Tree is considered a safe, effective, and economical and is accepted by, and widely used by gynecologists. The whole certified organic berry is milled immediately prior to encapsulation to retain the natural constituents present in this herb. Chaste Tree contains several different constituents, including flavonoids, iridoid glycosides, and terpenoids. The whole fruit, rather than any one of its individual constituents, appears to be necessary for the medicinal activity.