I was surprised the article didn't mention Ayahuasca, maybe the original source did. I know a few people that used it to get off heroin for good after going through several Regan-relapse cycles.
Which is effectively DMT.
Traditional preparations often (but not always) contain other components which contain DMT, the effect of which is normally metabolized by a mitochondrial enzyme called monoamine oxidase. Since the ayahuasca vine inhibits the activity of monoamine oxidase, a preparation of ingested DMT taken with, or after, an MAOI will allow the DMT to reach the brain.
The vine taken on its own, however, has an intense effect which is said to be mildly psychedelic, and a preparation of just the ayahuasca vine qualifies as ayahuasca.