“There have been some recent reports about hospitals, doctors, and health officials now refusing to treat U.S. patients with vitamin D, ivermectin, hydroxychloroquine, and another effective therapeutics.  A recent notation about HHS changing liability waivers under the PREP Act, might provide some insight."

https://theconservativetreehouse.com/blog/2021/08/31/hhs-amends-prep-act-liability-waiver-to-cover-only-nih-approved-treatments-for-covid-19/