Yes, a quick glance at the wikipedia ayahuasca page clears this up for you. This is a basic question, start with some general research before asking something like it please.
Look for the 'Essential Reading' link on the PD (psychedelic drugs BL forum) main page, either that or the Psychedelic Drug Index - leading to the same.
It is the heart of all so-called big and dandy mega-threads for the most basic topics.
This thread will be closed since only threads about topics that are not covered yet are allowed. All other ones will be combined with existing threads if that is valuable or closed like this one if they are not.