“…At the extremes, some researchers recommend large bolus doses of vitamin D, or correction of deficiency, primarily for patients who are diagnosed with COVID-19, and others recommended only the dose of vitamin D needed to maintain bone health (200–400 IU/day) ( 44 , 45 , 73 , 91 , 108 , 118 , 160 , 169 , 223 – 229 ). Additional authors recommend vitamin D supplements to boost the immune systems of patients diagnosed with COVID-19 ( 2 p , 35 , 69 , 71 , 74 , 75 , 118 , 120 , 125 , 230 – 233 ). However, most authors recommend widespread daily vitamin D supplementation (most often with 1,000–5,000 IU per day) to prevent and decrease the severity of COVID-19, at least until the pandemic abates ( 1 , 5 , 12 , 28 , 34 , 36 , 42 , 64 , 65 , 107 , 109 , 113 , 114 , 116 , 121 , 124 , 127 , 165 , 171 , 172 , 178 , 190 , 192 , 197 , 198 , 210 , 214 , 219 , 222 , 234 – 248 ) ( Figure 8 ).…”