One of the most studied herb is Camilla, aka Green tea. You cannot get enough of green tea. You probably aren’t going to drink 24 cups a day as some do in Chna. You need an excellent green tea capsule with high amounts of the most important ingredient - EGCG. This active ingredient targets the COVID 19 protease to reduce the viral replication This has been studied in health care workers in regard to the influenza virus. This study used 225 mg twice a day or drinking 4 cups of tea per day
The other herb is Curcuma longa aka Tumeric. This herb targets to COVID protease this inhibiting the viral replication. The amount of turmeric to take is higher than the usual dose. I do not suggest that adding to your food is enough. I always encourage a high potency curcumin tablet. These can be obtained by Botanical Bounty The amount I use is 1,000 mg ( 1 gram ) twice a day to three times a day