Brachos 43- ברכות מג

The Gemara concludes that we recite the bracha of ‘borei shemen areiv’ on the fragrant balsam oil.  How can we use the term ‘borei’ on an item that was produced by man (through extraction), just as we cannot apply the term ‘borei’ (borei pri hazayis)with reference to olive-oil since it is man-made (see Rashi 35b D”H zayis ikri)?