It's metabolised by MAO very rapidly, for one. For two, I don't believe it has enough (any?) 5HT2a affinity. I'm having trouble
I guess you forgot to mention that even DMT is completely metabolized by MAO (in the digestive track i think)
Hence why DMT is smoked in pipes or sometimes idiotically insufflated since i heard reports that its burns like f**k and tastes like s**t when it drops down the mouth.
MMT (monometyl T) is also a mild psychedelic but far from DMT and it will also get annihilated by MAOa.
However it seems that bufotenin and 5-MeO-DMt doesn't get attackes as much by MAO.
In fact 5-Meo-DMT is active orally at 30mg and up to 2 milligrams when inhaled/injected (unlike DMT which is active at a dose of 15-30mg when inhaled).
That's the reason why the DMT containing
Ayahuasca infusion drinks, (a very popular 'tea' in some parts of South America), is orally active.
Magic? No, its due to the presence of MAO harmala alkaloids in their infusion.
Also I think that the heavily methylated amine changes the polarity of the amine (increasing structure and lipophilicity) and thus increasing the psychedelic effect and 2-HT2a receptor affinity.
I, wihout reference unfortunately, can somehow relate that to the differences d-amphetamine, d-methamphetamine and d-dimethylamphetamine.
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BTW i found this on wiki:
The bio syntheis of endogenous DMT
Dimethyltryptamine is an indole-alkaloid derived from the shikimate pathway. Its biosynthesis is relatively simple and summarized in the picture to the left. In plants, the tryptophan is produced endogenously where in animals the tryptophan used comes from diet. No matter the source of tryptophan, the biosynthesis begins with the decarboxylation of L-tryptophan (1). Once decarboxylated, tryptamine (2) is dimethylated by S-adenosyl-methionine (SAM) via nucleophilic attack. This reaction is mediated by tryptamine-N-methyltransferase enzyme. This produces the product (3). The mechanism has been proven by radio labelling of SAM with carbon-14. The study found that various mammal tissues contained enzymes capable of performing the above transformation.
EDIT:
It would be fun coming up with a drug that enhanced SAM, That would make you dream like fuck since ,FWIH, DMT plays a big role in dreaming.