I’m not big on supplements, but in winter (half the year in Calgary) I take C, D, and zinc.
I had an assignment at a tropical mine when a position opened up due to a promotion, which came about when the department head died of malaria. I had the malaria medication at the ready, but did not use them as a prophylactic as prescribed. No one at the mine did because of side effects from long term use. There was not one exception. I sure wouldn’t start popping chloroquine now on the feeble strength of what is known at this point.