From your link:
Povidone Iodine (PVP-I) Oro-Nasal Spray: An Effective Shield for COVID-19 Protection for Health Care Worker (HCW), for all
nih.gov ^ | 4/8/2021 | Mostafa Kamal Arefin, FReeper smileyface
Posted on 1/2/2022, 2:46:59 PM by ransomnote
Letter-to-CDC-authors_2021.pdf (skirsch.com)