One of the main functions of vitamin D is to help activate T cells, aka the "killer cells" in the body. T cells actually detect and destroy foreign pathogens -- like viruses. "That makes vitamin D especially crucial for maintaining a functioning immune system that's capable of fighting back foreign pathogens,
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ZInc is critical too...
But it is a metal - and if you take in to much metal - your body will begin to dump 'all metal' including iron... and other key metals you need at 'micro- nutrient levels'
FYI for anyone:
Chromium helps maintain normal blood sugar levels and helps cells draw energy from blood sugar.
Copper assists with metabolizing fuel, making red blood cells, regulating neurotransmitters, and mopping up free radicals.
Iron helps make hemoglobin (the oxygen-carrying chemical in the body's red blood cells) and myoglobin (a protein in muscle cells). Iron is essential for activating certain enzymes and for making amino acids, collagen, neurotransmitters, and hormones.
Magnesium, like calcium, builds bones and teeth. It also helps to regulate blood pressure and blood sugar and enables muscles to contract, nerves to send messages, blood to clot, and enzymes to work.
Manganese helps form bones and helps metabolize amino acids, cholesterol, and carbohydrates.
Molybdenum activates several enzymes that break down toxins and prevents the buildup of harmful sulfites in the body.
Potassium balances fluids in the body, helps to maintain a steady heartbeat and to make muscles contract, and may benefit bones and blood pressure.
Sodium balances fluids in the body, helps send nerve impulses, and helps make muscles contract.