Calcium
Calcium works mainly on lymphocytes, which helps lymphocytes to maintain (Ca2) as low levels. In addition, vitamin D and calcium cooperation can affect on several types of immune cells like antigen-presenting, (T) and (B) cells to adjust both adaptive and innate immune responses, that may extend further than calcium and bone homeostasis.[34].
Therefore, vitamins and minerals as principal nutrients for immunonutrition might be useful for COVID-19 prevention.