Syrian rue or Peganum harmala is a popular MAO-inhibitor. It's often used in as a replacement ingredient in a traditional brew from South America.*
0,2 to 0,3 grams contains enough harmine and harmaline to block MAO activity for about six hours.
Peganum harmala contains a high concentration MAO-inhibiting substances. Avoid foods that contain tyramine and do not combine with SSRI's (prescribed or recreative) and similar medication. Keep out of children’s reach, store in a cool and dry place.