https://speakwithanmd.com/corsination/
Right now, I take Quercetin on regular basis, since I don't have a lot of HCQ. You can get Quercetin from Amazon. You can also get the zinc there. They say not to overdue zinc. It's in the eye medicine I take, so I don't take extra.
Vitamin D is supposed to be very good too for prevention. Since we don't have as much info on Quercetin and you decide to take it and zinc, you'll have to research and decide the right amount for yourself.
FWIW, my personal immune regimen:
Vit D3, 10,000 iu / once daily
Quercetin, 1000 mg / twice daily
Zinc, 50 mg / once daily
Pomegranate Extract, 450 mg / once daily
Vit C, 1000 mg / once daily
Apparently it works: haven’t been sick in years. Have never had a flu shot and most likely will not have China virus shot.