LTF and COVID-19: Analysis of the Spearman rank’s coefficients (Table 1 and Table S4) revealed moderate correlations between COVID-19 cumulative cases or deaths and RSVs of lactoferrin (r = 0.71, p ≤ 0.001, for both cases and deaths), elderberry (r = −0.77, p ≤ 0.001, for both cases and deaths), and turmeric (r = −0.74, p ≤ 0.001, for both cases and deaths) in the worldwide.