In this “banned” TED talk (I assume that means it’s not searchable on ted.com), Graham Hancock explains what Ayahuasca is, how historically sacred natural plant substances have been used, why they’re kept from us by our controllers, and the mission of Amazonian Shaman to share the Spirit with The West.
Here is an article about using Ayahuasca to cure depression (from the by-donation organization we visited in 2012)
http://ayahuascasatsangha.org/08/ayahuasca-and-depression/