Doesn't Ayahuasca contain an MAOI? If so, then it's pretty much confirmed to be dangerous.
Monoamine oxidase inhibitor - Wikipedia, the free encyclopedia
LOL, Have you seen the list of what has MAOIs, better stop drinking coffee and many teas:
List of MAOIs
Herbal Drugs
Selective MAO-A Inhibitors
Harmala alkaloids (found in Coffee,[27] Syrian rue,[28] Passion flower, Ayahuasca, Tribulus terrestris and Tobacco)
Harmine, Harmaline, Tetrahydroharmine, Harmalol, Harman, Norharman, etc.
Piperine[29] (found in Pepper has a 1.85 fold selectivity for MAOA over MAOB)
Resveratrol[30] (found in Japanese knotweed and skin of red grapes)
Nonselective MAO-A/MAO-B Inhibitors
Curcumin[31] (found in Turmeric)
Rhodiola rosea[32] (active constituent(s) unknown)
Ruta graveolens[33] (active constituent(s) unknown)
Ginkgo biloba[34]
Anthocyanins[35]
Proanthocyanidin[36]
Selective MAO-B inhibitors
Catechin (found in the Tea plant, Cocoa, and Cat's claw)
Desmethoxyyangonin (found in Kava)
Epicatechin[37] (also found in the Tea plant, Cocoa, and Cat's claw)
Emodin[29] (found in Fo-Ti)
Hydroxytyrosol (found in Olive oil)
Gentiana lutea[38] (active constituent(s) unknown)
Unknown Selectivity
Liquorice (active constituent(s) unknown)
Myristicin (found in Nutmeg, Parsley, and Dill)
Siberian Ginseng (active constituent(s) unknown)
Yerba Mate (active constituent(s) unknown)
Yohimbe (active constituent(s) unknown)
Pharmaceutical Drugs
Nonselective MAO-A/MAO-B Inhibitors
Hydrazines
Benmoxin (Nerusil, Neuralex)
Hydralazine (Apresoline)
Iproclozide (Sursum)
Iproniazid (Marsilid, Iprozid, Ipronid, Rivivol, Propilniazida)
Isocarboxazid (Marplan)
Isoniazid (Laniazid, Nydrazid)
Mebanazine (Actomol)
Nialamide (Niamid)
Octamoxin (Ximaol, Nimaol)
Phenelzine (Nardil, Nardelzine)
Pheniprazine (Catron)
Phenoxypropazine (Drazine)
Pivalylbenzhydrazine (Tersavid)
Procarbazine (Matulane, Natulan, Indicarb)
Safrazine (Safra)
Non-Hydrazines
Caroxazone (Surodil, Timostenil)
Echinopsidine (Adepren)
Furazolidone (Furoxone, Dependal-M)
Linezolid (Zyvox, Zyvoxam, Zyvoxid)
Tranylcypromine (Parnate, Jatrosom)
Selective MAO-A Inhibitors
Brofaromine (Consonar)
Metralindole (Inkazan)
Minaprine (Cantor)
Moclobemide (Aurorix, Manerix)
Pirlindole (Pirazidol)
Toloxatone (Humoryl)
Selective MAO-B Inhibitors
Lazabemide (Pakio, Tempium)
Pargyline (Eutonyl)
Rasagiline (Azilect)
Selegiline (Deprenyl, Eldepryl, Emsam)
Research Compounds
Nonselective MAO-A/MAO-B Inhibitors
Hydrazines
Metfendrazine
Selective MAO-A Inhibitors
Amiflamine
Bazinaprine
Befloxatone
Befol
Cimoxatone
Clorgyline
Esuprone
Methylene Blue
Sercloremine
Tetrindole
Thesputiaint
CX157 (Tyrima)
Selective MAO-B Inhibitors
D-Deprenyl
Ladostigil
Milacemide
Mofegiline
Antiparasitic
Invertebrate MAO Inhibitors
Amitraz antiparasitic used in animals for ticks, mites (sarcoptes, demodex) and lice. Used on plants as an insecticide against mites, aphids, etc.