This is coming from a different thread but SWIM's FOAF believes this is a more appropriate place for it.

Now, which caapi variety is reported to contain the most (or mostly) THH to work with? Ideally one wants a source that either contains only THH. But THH with harmine may be easy to work with as well. But if caapi contains THH, harmine and harmaline things get much more complicated and difficult for the home experimenters. If the latter is the case some column chromatographic separation may be more suited to attack the issue.