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