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The winter-spring seasonality of influenza vitamindstopscovid.info… and COVID-19 vitamindstopscovid.info… is primarily due to lower 25-hydroxyvitamin D levels at those times.
Most people who do not supplement vitamin D3 properly (such as 0.125 mg 5000 IU a day on average, for 70 kg 154 lb body weight without obesity) and who have not rece…
The winter-spring seasonality of influenza https://vitamindstopscovid.info/00-evi/#4.1 and COVID-19 https://vitamindstopscovid.info/00-evi/#4.2 is primarily due to lower 25-hydroxyvitamin D levels at those times.
Most people who do not supplement vitamin D3 properly (such as 0.125 mg 5000 IU a day on average, for 70 kg 154 lb body weight without obesity) and who have not recently had extensive ultraviolet-B exposure of ideally white skin have half or less of the 50 ng/mL 125 nmol/L circulating 25-hydroxyvitamin D their immune system needs to function properly.
Please see the research articles cited and discussed at: https://vitamindstopscovid.info/00-evi/. This begins with vitamin D3 supplemental intake recommendations by New Jersey based Emeritus Professor of Medicine, Sunil Wimalawansa, to attain at least 50 ng/mL (125 nmol/L) circulating 25-hydroxyvitamin, without the need for blood tests. These recommendations are based on his recent article in Nutrients: Rapidly Increasing Serum 25(OH)D Boosts the Immune System, against Infections - Sepsis and COVID-19 https://www.mdpi.com/2072-6643/14/14/2997 .
"5000 IUs" sounds like a lot, but it is 1 gram every 22 years - and pharma grade vitamin D3 costs about USD$2.50 a gram ex-factory.