Laaate answear, because I didn't research it any more. Last year I was researching how Acacia trees that are growing in Africa could do a multiple cure for our planet and us, inhabitants. Yes you are right, Harman!
Acacia trees are good for plantation to bind CO2 to the soil, also some Acacias contains DMT which is a good medicine for mental health, and by example Acacia accuminata contains Harman AND THAT'S WHEN I BUMPED INTO YOU I BELIVE! What an amazing plant to grow in the dry areas of Africa I thought. It could help to solve a lot of issues in the world.
I think I read an science article about Harman as an anti HIV agent. But now I couldn't find it. So, I personally don't know much about this field.