This website lists all the information on prevention and early home treatment you need to protect yourself against covid 19.
The most common prevention protocol consists of the following agents:
Hydroxychloroquine: Need to get prescription for this medication.
Zinc sulfate (50 mg zinc per day or 220 mg zinc sulfate)
Vitamin D: 5000 IU per day
Vitamin C: 1 to 5 grams per day administered multiple times in a day.
Early home treatment protocols are also available.