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Psychotria viridis
DMT Contents and Dosages
by erowid, July 2001

(see also D. cabrerana DMT Content)

AuthorLocation/SourceYearDMT Content (per dry leaf)
Callawayvarious1999avg 10 mg/g dried leaf (0.0 - 17.65)
McKenna DJ, et alIquitos "Chacruna"19841.58 mg/g (+/- 0.3SD)
McKenna DJ, et alTarapota "Suija"19841.02 mg/g (+/- 0.04SD)
McKenna DJ, et alPucallpa "Chacruna"19841.2 mg/g (+/- 0.17SD)
Rivea & LingrenCulina Indians, Zapote1972avg 3.3 mg/g (0.0 - 6.6 mg/g)
Urzua, Schultes REShipibo & Iquitos "Chacruna"19722.4 mg/g (crude base)

In Psychotria, the concentration of alkaloids ranged from 0.1 to 0.66 % dry weight (McKenna, et al., 1984; Rivier & Lindgren, 1972). Similar ranges and values were reported by both groups of investigators.
From Scientific Investigation of Ayahuasca: McKenna, Callaway, Grob, 1998

From thirty-seven samples of P. viridis, collected in the morning on the same day from several locations throughout Brazil, the DMT concentrations were found to range from 0.00 to 17.65 milligram per gram (mg/g) of dried leaf. Most samples had a value of approximately 10 mg/g DMT, and only one had undetectable amounts. It is possible that this specimen was not P. viridis, but another species of Psychotria.

Most remarkable were the results from the consecutive samples taken from the same plant at several different times throughout the day. The highest levels of DMT were found in those leaves that were collected at dawn (8.97 mg/g) or before dusk (9.52 mg/g DMT). The leaves that had the least amount of DMT were those collected at midnight (5.57 mg/g), and another depression in alkaloid content appeared near 10:100 am (8.01 mg/g DMT) and subsequent values remained low throughout the hotter parts of the day. One could argue that these are simply variable values from different leaves, although special consideration was taken to include leaves at equivalent stages of development. It is also important to note that these quantitative results are in agreement with what has been observed over years of practical experience.

From Phytochemistry and Neuropharmacology of Ayahuasca, JC Callaway, 1999, in Ayahuasca by R Metzner

  • McKenna D, Callaway JC, Grob CS.
    The Scientific Investigation of Ayahuasca: A Review of Past and Current Research.
  • McKenna DJ, Towers GH, Abbott F.
    Monoamine oxidase inhibitors in South American hallucinogenic plants: tryptamine and beta-carboline constituents of ayahuasca.
    J Ethnopharmacol. 1984 Apr;10(2):195-223.
  • McKenna DJ, Towers GH.
    Biochemistry and pharmacology of tryptamines and beta-carbolines. A minireview.
    J Psychoactive Drugs. 1984 Oct-Dec;16(4):347-58. Review.
  • Ott J.
    Ayahausca Analogues
    1994, Natural Products Company.
  • Rivier L, Lindgren JE.
    "Ayahuasca, the South American Hallucinogenic Drink: an Ethnobotanical and Chemical Investigation"
    Economic Botany. 1972; 26: 101-129.
  • Trout K.
    Trout's Notes on Ayahuasca and Ayahuasca Alkaloids
    #A-5 [Version 11-98]