caapi's harmala alkaloids has precluded a balanced assessment of B.
There is a great deal of variation in the concentrations of harmala alkaloids in B.
They go on to say that: "Although these harmala alkaloids are not particularly psychoactive on their own, they can facilitate the activity of N,N-dimethyltryptamine (DMT) from P.
3 Piaroa yopo is the only snuff yet tested that contains both tryptamine and harmala alkaloids (Holmstedt & Lindgren 1979).
While harmala alkaloids manifest hallucinogenic activity on their own at dosage levels several times greater than are required for them to function as monoamine oxidase inhibitors (Buckholtz & Boggan 1977; Rivier & Lindgren 1972), it is probable that Piaroa shamans consume quantities of B.