Despite a pretty successful globo-campaign to ban ivermectin & close-down any studies, there remains a few 'natural experiments'.

Peru is an interesting case coz at first it promoted ivermectin but then got the memo from WHO & banned it - so there's data for both 'trials'.

Epoch Times: When ivermectin was available without restriction, there was a fourteenfold reduction in nationwide excess deaths. Once access to ivermectin was restricted by the government, a thirteenfold increase in excess deaths was observed in the two months following the limitation of its use.

Pradesh, India provided another 'natural experiment':

After the mass distribution of ivermectin, the seven-day moving average of COVID-19 deaths in Uttar Pradesh decreased by 97 percent. The cumulative total of COVID-19 deaths per million in population from July 7, 2021, through April 1, 2023, was 4.3 in Uttar Pradesh, compared with 70.4 in all of India and 1,596.3 in the United States.