The Spark tracker relies on public databases. Those databases do NOT have complete information for trace elements. Don't even bother getting an analysis of things like that unless you have reason to believe you're deficient and your doctor says you need to get those things from diet. If your doctor *does* tell you that you need to monitor your intake, you'll have to look at those values for every item you track, and if it lists a 0, go to the most developed version you can find of the USDA database to find those values.
The list of foods that are high in zinc is so long that you would pretty much have to be anorexic to be deficient. Overdose is more common than deficiency. Selenium can't be tracked without lab testing of the food, because the selenium content of a food depends on the soil it was grown in. But it doesn't matter, because humans basically don't get selenium deficiency. The exceptions are people with severe digestive disorders, and they'll be so sick that selenium is the last of their worries. You barely need any copper, and it's in almost everything you eat, so it's not a worry.
Basically, if you eat anything at all other than Slurpees, you're going to be getting enough of these metals. Supplementing with metals can be very risky-- in fact, one of the few ways people can get a copper deficiency is by overdosing with zinc.
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