THE LOSS OF SMELL AND TASTE   (This can often appear in COVID-19).
This is a classic symptom of zinc deficiency, which also plays a role in immunity.
​(https://conta.cc/3aRp7OE)

​DIABETES TYPE II   (This can aggravate COVID-19).
Zinc is also imperative for the production of insulin, which is crucial for controlling Diabetes Type II.  Every insulin molecule contains 2 molecules of zinc at the center of the insulin molecule.  

VITAMIN D3   (This is a deficiency that often appears in COVID-19).
​We have vitamin D receptors on every cell in our bodies.  Vitamin D is especially crucial for our immune systems.