If anyone still doubts the efficacy of vitamin D to protect against coronavirus infections, the study “The Impact of Vitamin D Level on COVID-19 Infection: Systematic Review and Meta-Analysis” published today (5 Mar 2021) should provide additional proof. Researchers found:
“The pooled analysis showed that individuals with Vitamin-D deficiency were 80% more likely to acquire COVID-19 infection as compared to those who have sufficient Vitamin D levels“
“In conclusion, low serum 25 (OH) Vitamin-D level was significantly associated with a higher risk of COVID-19 infection.”
Hence, it makes sense for adults to take 20,000 to 60,000 IU Vitamin D if a covid infection is suspected, provided that you don’t take any other medications that vitamin D might interfere with. An equal dose or up to twice that dose of vitamin A as retinol would also help, but that was not investigated in the above study.
And another recent study Vitamin D and Its Potential Benefit for the COVID-19 Pandemic states:
“there is no downside to increasing vitamin D intake and having sensible sunlight exposure to maintain serum 25-hydroxyvitamin D at least 30 ng/mL (75 nmol/L) and preferably at 40 – 60 ng/mL (100 – 150 nmol/L) to minimize the risk of COVID-19 infection and its severity“