Is tetrahydroharmine extracted along with harmine and harmaline when extracting from caapi vine?

I am not a very seasoned extractor but from what i understand although a little THH is extracted from caapi vast majority of THH comes from converting Harmaline into THH via reduction.

I don't think this the case; with caapi extraction an a/b will supposedly pull all three harmala alks. A manske is supposed to leave behind THH while grabbing harmine/harmaline (althought I don't know that this has been verified).

Also, you can add Eleagnus angustifolia (russian olive) to your list as it contains "harman and tetrahydroharman" according to literature floating around.

I read a bit about Tribulus terrestris containing harmala alks awhile back. A few people had tried using it as an MAOI to activate DMT. I got distracted with other things and didn't end up pursuing it, and I haven't really kept up on whether anyone else has reported success with it since I compiled a brief summary a couple years ago.

Here's the summary: https://www.dmt-nexus.me...spx?g=posts&m=141098

That ought to at least give you a starting point if you're interested in following up on it, I've still got too much on my plate just now.

has only relatively recently been shown to have potent reversible inhibition of MAO-A and B..Harman binding experiments. I: A reversible and selective radioligand for monoamine oxidase subtype A in the CNS of the rat. May T, Rommelspacher H, Pawlik M. 1991
from the abstract:

.. a chemical supplier says: "Harman... Potent inhibitor of monoamine oxidase A and B (IC50 values are 0.5 and 5 μM respectively)"..Rommelspacher [2002] - found as an inhibtor of MAO-B, "Harman had an IC50-value of approximately 1 μM (competitive interaction)."..this is comparable (slightly stronger infact from my understanding of IC-50 values) to Harmine, of more fame..the paper by Samoylenko et al. [2010] posted by endlessness in this thread www.dmt-nexus.me/forum/d...aspx?g=posts&t=26443 "found Harmaline and harmine showed..inhibitory activity against...(MAO)-A and -B enzymes (IC50 2.5 and 2.0 nM, and 25 and 20 μM)."
..Harman was also found in Fagonia cretica (Zygophyllaceae, native to Alicante Province, Spain and the Balearic Islands -aerial parts) by the authors of this paper Structure of Harman- El-Sayed et al. 1986 characterising it's structure...it has been found in Phaseolus vulgaris (Leguminoseae), several Australian Acacias, the African Pauridiantha lyallii (Rubiaceae) as well as in Raisins, and in traces in Tobacco and cannabis smoke..

there has been a false myth in the entheogenic community for years that harman is not very active..