Vitamin A and D protect against the common cold.

One of the things that happens to promote lung damage by the virus [SARS-CoV-2]: lung cells start making less ACE2 to protect themselves. Because ACE2 is normally a health-promoting molecule, that contributes to the lung damage ... The virus causes you to lose ACE2, and that leads to lung damage.

On most surfaces, coronaviruses survive for 5-9 days; on a copper surface, they survive for 5-30 minutes.

Someone with a zinc deficiency is probably more vulnerable to COVID-19 infection.

Animal studies suggest vitamin A & D increase ACE2, the receptor that SARS-CoV-2 binds to.

The more ACE2 mice have, the faster they die after SARS-CoV-1 infection.

Zinc can cause a copper deficiency. You really want at least 1 mg of copper for every 15 milligrams of zinc that you get.

Amid COVID-19, limit vitamin A intake to 3000 IU per day.

700-1,000 mg of elderberry extract (the amount derived from ~25 grams of fresh berries) has been shown to have antiviral effects against the cold and flu.