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.