Long before any written record, Indigenous peoples in South America were working out one of the most chemically sophisticated problems in the history of medicine — how to unlock the healing and visionary power of DMT-containing plants. The archaeological trail they left behind is fragmentary but real, and it points to a tradition of knowledge that is both ancient and continuously evolving.
What the evidence shows
- DMT plant medicine: The earliest confirmed archaeological evidence for DMT-containing plant use in South America dates to around 2130 B.C.E. — two pipes found in northwest Argentina with Anadenanthera seeds, testing positive for DMT residue.
- Snuffing devices: Whale-bone trays and bird-bone tubes from central coastal Peru, dated to approximately 1200 B.C.E., represent the oldest known snuffing tools in South America, suggesting an even broader geographic spread of these practices.
- Ayahuasca brew: The specific combination of a DMT-containing plant with the Banisteriopsis caapi vine — the drink now known as ayahuasca — has no documented archaeological or written evidence prior to the 18th century C.E., despite widespread claims that its use stretches back 5,000 years.
The chemistry of a remarkable discovery
To understand what these ancient practitioners were doing, it helps to understand the chemistry they were navigating — almost certainly through generations of trial, observation, and oral transmission.
DMT, or dimethyltryptamine, is a potent hallucinogen found in a range of South American plants, including the shrub Psychotria viridis and several trees in the genus Virola. The problem is that DMT taken orally is quickly broken down by an enzyme in the stomach lining called monoamine oxidase-A before it can reach the brain.
There are two ways around this. The first is to bypass the digestive system entirely — by snuffing, smoking, or inhaling the plant material. That is what the archaeological record shows these early practitioners doing. The second, more elaborate solution is to combine DMT with a plant that contains MAO inhibitors, chemicals that block the enzyme and allow DMT to work when swallowed. That second path leads to ayahuasca.
The ayahuasca vine, Banisteriopsis caapi, contains exactly such inhibitors — the beta-carbolines harmine, harmaline, and tetrahydroharmine. When combined with a DMT-containing companion plant like Psychotria viridis, the result is a drink that produces powerful visionary states. This combination, as far as scholars can determine, developed only in the Upper Amazon — and represents one of the most pharmacologically precise discoveries in human history, arrived at without laboratories or written chemistry.
The Chavín culture and a tradition takes shape
By around 900 B.C.E., the use of DMT-containing snuffs had become a central feature of the Chavín culture in the northern Andean highlands of Peru. Elaborately carved mortars, bone tubes, decorated spoons, and snuff trays have been uncovered at Chavín sites. Artwork at Chavín de Huántar depicts figures with wide-open eyes and streams of mucus running from their nostrils — almost certainly the result of snuffing — and some appear half-human, half-feline or half-bird, suggesting shamanic transformation rituals tied to these substances.
This was not casual or recreational. The material culture surrounding these practices — the carved trays, the bone tubes, the elaborate ceremonial contexts — points to a sophisticated, socially embedded tradition of using plant medicines to access altered states for healing, divination, and spiritual guidance.
Lasting impact
The tradition of Amazonian and Andean plant medicine did not freeze in time. It evolved, spread, and diversified across thousands of years and hundreds of distinct Indigenous cultures. The knowledge was passed through shamanic lineages, refined through practice, and adapted as peoples moved and traded across the continent.
Today, ayahuasca ceremonies are practiced by dozens of Indigenous groups across the Amazon basin and have attracted global attention for their potential therapeutic uses. Clinical researchers at institutions including Imperial College London’s Centre for Psychedelic Research are studying DMT and related compounds for their effects on depression, PTSD, and addiction. Early-phase trials have shown promising results for treatment-resistant depression, suggesting that what Indigenous peoples discovered through centuries of practice may have applications modern medicine is only beginning to understand.
The knowledge embedded in Amazonian plant medicine traditions — which plants to combine, how to prepare them, how to conduct ceremonies safely — represents a form of empirical science developed over generations. Researchers have noted that the sophistication of the ayahuasca formulation in particular is difficult to explain except through systematic, long-term experimentation.
Indigenous organizations across the Amazon are now working to protect not only their lands but their plant knowledge — increasingly recognized in international frameworks as a form of intellectual and cultural heritage. The UN Declaration on the Rights of Indigenous Peoples explicitly addresses the right of Indigenous communities to maintain and protect their traditional knowledge systems.
Blindspots and limits
The archaeological record for early plant medicine use in South America is genuinely thin, and the popular claim that ayahuasca has been used for 5,000 years lacks hard evidence. Scholars including anthropologist Steve Beyer, whose research informs this article, have pointed out that this claim often reflects a romanticized view of Indigenous cultures as unchanging and timeless — which, paradoxically, denies the creativity, adaptability, and ongoing innovation of those same cultures. The specific ayahuasca brew as it exists today may be a relatively recent development, perhaps only a few centuries old in its current form. What is ancient is not one fixed drink, but a living, evolving tradition of plant knowledge.
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