are WHO the only source for data on Ivermectin? No. It's been around so long time, its patent ran out. The data is solid on it. Also, it was not created in a lab but found in "nature" if we consider a Japanese golf course nature, and the drug was created from this thing found in the real world. So, I don't know what definition you're using for "chemical" but it might be to broad to be of any use.

I am not saying take the drug without reason, but if find yourself in the same situation as people are deciding to take it, what options would you choose?