How does Ivermectin prophylaxis with zinc and D3 supplements change that cost-benefit equation? Ivermectin has a risk profile about like aspirin or Tylenol.
Here’s this for you too:
18 Reasons I Won’t Be Getting a Covid Vaccine
https://www.deconstructingconventional.com/post/18-reason-i-won-t-be-getting-a-covid-vaccine
We have no idea how much such a supplement regime changes the odds. Add to that there is no way to know what drugs/supplements medical personnel are taking, and there is no way to mandate that they take them.
Its just fine as personal advice, and if widely followed it would have some beneficial effect, but its not something one can mandate.