The article joins others, many also flagged by Meyerowitz-Katz, purporting to find links between vitamin D intake and COVID-19 severity that have been retracted or removed. In an April 2022 thread on X, Meyerowitz-Katz noted the study’s “MASSIVE effect, whereby virtually everyone who died” had vitamin D levels below the normal range, he wrote at the time. The study considered low vitamin D levels to be less than 20 ng/mL, and 15 people had a vitamin D level of exactly 10 ng/mL. “This makes having a vitamin D of exactly 10ng/mL the most dangerous range seen in the study,” Meyerowitz-Katz wrote. It previously read, “Authors defend retracted paper on vitamin D and COVID-19 critic called ‘deeply bizarre’”.