bht has not been on my radar but noticed it is used for herpes, cold sores, etc
Valtrex is on the list of things that might help with Covd but it is a script
There are a lot of online places that do scripts for STDs.
All of them have one characteristic in common which includes the family of corona viruses and that is that they have a lipid coating. These are the ones which don’t get along with BHT.