and here lies one of the mysteries of pharmahuasca.. Mostly everyone taking pure extracted dmt says that a higher amount is needed compared to the reported ayahuasca dosages (Ott is the one that mentions this 30mg number ).. So why is that? There are a few possible reasons..
1- In normal ayahuasca sessions, people generally take more than one dosage. In santo daime, for example, it is generally at least 3 doses during a night.. So ppl are not limited to one 30mg, but to, say, 60 or 90mg or more... Whereas in pharmahuasca people take it all at once
2-In general, the b-carboline dosages in ayahuasca are quite strong, which may account to even less dmt being destroyed, or to a psychoactive effect of it´s own
3- One could also suppose that there is more to ayahuasca than the ´extracted purified principles´, that the whole synergy of the plants are responsible for stronger trips even in lower dosages..
4- Maybe people taking crystals dont have them purified enough, as compared to the accurate analysis where the ´30mg number in normal ayahuasca dosage´ came from.. Think about recrystallization, how one can lose half the amount of DMT depending on how yellow it is.. so maybe if everyone had very pure dmt the dosage would be closer to the reported analyzed one...
or maybe some other reasons one can think of... Fact is, it IS in general reported that more is necessary in extracted oral dmt... an interesting thing to research more about.