Chaga Mushroom extract, boosts T cells and also is an immune modulator. Best not to use immune booster as Covid takes advantage of over active immune system to trigger inflammation damage.
Buy chaga extract on Amazon,
to make your own extract: Buy raw haha mushroom chunks, crush with channel locks to pea size and feed to burr grinder coffee mill set to finest setting.
Summer two table spoons powder to 4 cups of water for 2 hours down to two cups liquid. Filter in coffee filter squeezing out liquid remnant. Put in eyedropper bottle.
One eye dropper full in small glass of water or morning coffee.