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