In yet other embodiments of the invention, {HEAD ~ the active agent} is {TAIL ~ an element} selected from the group consisting of: Fe, Ca, Mn, Mg, Cu, and Zn 
is
In yet other embodiments of the invention , { HEAD ~ the active agent } is { TAIL ~ an element } selected from the group consisting of : Fe , Ca , Mn , Mg , Cu , and Zn
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH