In addition, our meta‐analysis indicated that quercetin intake did not significantly change CRP (SMD: −0.04, 95% CI: −0.36, 0.27, I2 = 71.14% n = 5), D‐dimmer (SMD: 0.02, 95% CI: −0.27, 0.30, I2 = 63.85% n = 5), or ferritin (SMD: −0.17, 95% CI: −0.53, 0.18, I2 = 74.37% n = 4) compared to standard treatment in COVID‐19 patients (Figure 3). This evidence concerns the gene CRP and COVID-19.