The National Institutes of Health are assessing whether ivermectin is effective against COVID-19, Dr. Anthony Fauci said Tuesday.

Fauci, President Joe Biden’s chief medical adviser and the director of the National Institute of Allergy and Infectious Diseases, testified to lawmakers that there have been mixed guidelines about the use of ivermectin against COVID-19 from different health agencies around the world, and the NIH guidance panel previously concluded there was not enough evidence to say whether it is effective against COVID-19.