Wiki has some engaging info in yttrium, fer shure. Amazing how obscure it appears to be in most health-minded communities, and online (that is, as an element essential to the body as opposed to technology, etc. only). Wiki offers I think only one reference w respect to use in treatment - cancer of the liver.
N, do you know any other foods which contain it? Better yet, do you remember where you learned that cherries have yttrium? Was there a post over in Io that I missed?