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