By Richard Fausset Joe Grinsteiner is a gregarious online personality who touts the anti-parasitic drug ivermectin. In a recent Facebook video, he produced a tube of veterinary-grade ivermectin ...

That has doctors alarmed. By Dani Blum At least once a week, someone asks Dr. Skyler Johnson if ivermectin can treat their cancer. Patients have asked about the anti-parasitic drug for years ...