You could contact the manufacturer and see if there is zinc in there. I add 1/2 of a 15 mg diet supplement tablet for 10 gallons of beer. It is ground to a powder and goes in at 15 minutes.
Pennies are 97.5% zinc, 2.5% copper these days, They are copper plated, so the zinc may not be availabel to the wort. Pennies are used in the boil to help prevent boil overs. Trace copper is good for the yeast too.