Why zinc in the coffee? Does it bind to something in coffee and become more bioavailable? I'd think if anything the plant compounds in coffee would chelate the zinc with such affinity that it wouldn't be usable any longer...
That's a technical measure.
In current phase of Apocalypse epoch I regularly use zinc as booster to my own immunity. Though I am not accustomed for life to take any medicaments or supplements regularly, so I often forgot to do so. Putting a zinc pill in my first daily coffee guarantees the exact dose is taken. I never ever miss my first coffee...
The same goes with weekly selenium.
About possible reduction of zinc effect by interaction with other coffee components, observably my nails are now much thicker and harder and also I am regrowing very long hairs again with no loss, so I consider this indicates the treatment is effective.
By dietary databases, zinc is a natural component in many varieties of coffee beans, while decafeinated brands lose almost all naturally contained zinc.
"Apocalypse epoch" isn't due to the coronavirus, idiot. It's 40+ years of Reaganomics and the associated foreign and domestic policy degeneration that both enabled and followed from it. You've got the survival quotient of a sick mosquito in an active crematorium oven no matter how much zinc you take.