difference between zinc and zinc oxide?

hey
im curious .. is there a difference between zinc and zinc oxide.
because i know too much of zinc isnt good for you ...
in my multi vitamin it has 25mg of zinc oxide per caplet ...
i also have zinc losenges (doesnt say oxide) ... i want to know if zinc oxide is different, because if it is then i can take the lozenges.

the lozenges have 13mg of zinc each ...
the reason why i think they might be different is because i know 25mg for one caplet (i take two a day) is alot of zinc.

so hope someone can help.

and one more thing, when is the best time to take zinc lozenges?

thanks
 
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