A vitamin D deficiency is not uncommon in our part of the world. The “dark season” can lead to this deficiency even with an otherwise intact immune system.
According to the Federal Institute for Risk Assessment (BfR), there are now indications that an inadequate vitamin D serum level is associated with an increased risk of acute respiratory infections. This also includes the COVID-19 disease. The data situation is still too thin to make a general recommendation for taking vitamin D supplements to prevent SARS-CoV-2 infection, but attention should be paid to this aspect.
If you want to supplement with vitamin D prophylactically, you can use supplements with a daily dose of up to 20 micrograms (800 international units) of vitamin D. This amount is considered harmless. A higher dosage is only recommended after medical consultation.
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