Wikipedia
N-Methyltryptamine (NMT), or methyltryptamine, is a member of the tryptamine chemical class. It is an alkaloid, probably derived from L-tryptophan, that has been found in the bark, shoots and leaves of several plant genera, including Virola, Acacia, Mimosa, and Desmanthus—often together with the related compounds N,N-dimethyltryptamine (DMT) and 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT). It is also synthesized in the human body as a metabolic endproduct of the amino acid L-tryptophan. It was found to be a natural trace component in human urine.
Orally administered NMT appears to produce no psychoactive effects, likely as a result of extensive first-pass metabolism. However, it may become active upon combination with a MAO inhibitor (MAOI). By vaporization NMT shows activity at 50–100 mg, with a duration of 45–70 minutes; duration of visual effects 15–30 seconds. Effects are primarily non-visual.