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