This holy anointing oil is blended according to the only recipe in the Bible.  In Exodus 30, G-d told Moses exactly how His holy anointing oil was to be made.

Since the days of the Temple, this oil could only be made using olive oil from Mount Carmel; the source of the finest oil in Israel.  And so we too use oil from that source. 

We combine that with essential oils from the same places that Moses would have gotten the other elements since none of them were ever native to Israel.