Table 1.

Clinical symptoms similar to COVID-19 and its relationship with vitamin D (from previous studies).

Symptoms/Characteristics	Relation to Vitamin D	References
Acute respiratory distress syndrome (ARDS) risk	Inverse correlation	[10,31]
Severe pneumonia	Inverse correlation	[20,32,33]
Sepsis risk	inverse correlation	[34,35]
Pro-inflammatory	Inverse correlation cytokine production	[36,37]
C-Reactive Protein increase	Inverse correlation	[38]