Pipermint, sage and lemon balm

[Rita]

http://www.retrovirology.com/content/5/1/27
It looks like a serious paper from a german university.
Perhaps a simple and affordable herbs can make a lot for us.

 

[caledonia]

I could only skim it, but it sounds like they would be used as a topical microbicide, in other words, applied on the skin/vagina, etc. to protect against transmission during sex.