What Animals Have DMT? A Look Into the Animal Kingdom

DMT, or N,N-dimethyltryptamine, is not just a plant compound or a synthetic drug. It is produced naturally inside the bodies of mammals, including rats and almost certainly humans. The most striking evidence comes from rat brain studies showing that the organ actively synthesizes and releases DMT at concentrations in the same range as familiar brain chemicals like serotonin. The picture gets more interesting and more complicated from there, touching on toad secretions that are often confused with DMT, a persistent myth about the pineal gland, and an open question about why animal bodies bother making this molecule at all.

Rats and the Proof That Mammal Brains Make DMT

The clearest evidence that an animal produces DMT comes from laboratory rats. Researchers identified DMT as an endogenous compound in the rodent central nervous system decades ago, using sensitive gas chromatography techniques that could pick out the molecule alongside its precursor, tryptamine.¹ But simply detecting a trace chemical and proving the brain is actively making and releasing it are two different things. That stronger proof arrived in 2019, when a team at the University of Michigan showed that the rat cerebral cortex not only contains DMT but releases it into the space between neurons at concentrations comparable to those of serotonin and other well-known signaling molecules.² Under normal conditions, DMT concentrations in the rat brain ranged from roughly 0.05 to 1.8 nanomolar, with an average around 0.56 nanomolar. Those are tiny amounts in absolute terms, but the fact that they sit in the same ballpark as the brain’s everyday chemical messengers was a genuine surprise to the field.

The researchers also tested whether the pineal gland was the sole source. When they removed it, DMT levels in the cortex stayed about the same, proving that the brain tissue itself handles production. That finding matters because it shifts the conversation away from the pineal gland as a mysterious DMT factory (more on that below) and toward the broader question of which tissues in which animals carry the necessary molecular machinery.

The Enzymes That Build DMT and Where They Show Up

DMT is built from tryptophan, the same amino acid your body gets from food. The production route is short: first, an enzyme called aromatic L-amino acid decarboxylase (AADC) strips a chemical group off tryptophan to make tryptamine. Then a second enzyme, indolethylamine-N-methyltransferase (INMT), adds two methyl groups to tryptamine in sequence, using a common biological methyl donor called SAM.³ The 2019 rat study confirmed that both AADC and INMT are present in the rat brain, establishing that the organ has everything it needs to run this pathway on its own.²

INMT is the more interesting enzyme for understanding which animals could produce DMT, because AADC is extremely common across species while INMT is more selective in where it appears. In mammals, INMT has been found in the lungs, liver, and brain, among other tissues. Research on human fetal and adult lungs has shown that INMT is among the genes with distinct expression patterns at different developmental stages.⁴ The fact that this enzyme turns up in liver, lung, and brain tissue in both rats and humans strongly suggests that DMT production is not a quirk of one species but a feature conserved across mammals.

The exact list of species confirmed to produce endogenous DMT remains short because the analytical work is difficult and expensive. Most research has focused on rats and, to a lesser extent, human tissue samples. But the enzymatic machinery is widespread enough in mammals that many researchers treat endogenous DMT as likely present across the class, even if direct measurement has only been done in a handful of species.

Does the Pineal Gland Flood the Brain with DMT?

One of the most popular claims in psychedelic culture is that the pineal gland releases a flood of DMT at birth, during dreams, and at the moment of death, producing mystical or near-death experiences. The idea has deep cultural roots but thin scientific support. A 2018 review in the Journal of Psychopharmacology addressed this directly, noting that while trace amounts of DMT have been detected in the brain, the concentrations are far too low to produce psychoactive effects. The adult pineal gland weighs less than 0.2 grams, and its main job is producing about 30 micrograms per day of melatonin for circadian rhythm regulation.⁵

The rat experiments described earlier reinforce this. Removing the pineal gland did not change cortical DMT levels, meaning whatever DMT the brain produces comes from other tissue. The pineal gland may contribute some small fraction of DMT synthesis, and researchers have confirmed the presence of DMT and related compounds in rat pineal gland microdialysate using sensitive mass spectrometry methods.⁶ But calling the pineal gland the DMT organ of the brain overstates what the evidence shows. It is one tissue among many where the relevant chemistry occurs, and not the most important one.

Toads Produce Something Similar but Different

When people talk about “animals with DMT,” toads come up immediately. The Sonoran Desert toad (Incilius alvarius) is famous in psychedelic circles for producing a powerful psychoactive secretion. But the primary compound in that secretion is 5-MeO-DMT (5-methoxy-N,N-dimethyltryptamine), not DMT. The two molecules are chemically related and both interact with serotonin receptors, but they produce meaningfully different effects and are not interchangeable. Research comparing them in mice has shown that DMT produces a bell-shaped dose-response curve in the head-twitch response assay, while 5-MeO-DMT causes a steady, monotonic increase.⁷

A study of the Sonoran Desert toad’s diet found no evidence that the toad obtains 5-MeO-DMT from its food. The toad showed no particular prey specialization compared to other toad species living in the same habitat, and toads in different environments ate somewhat different prey without corresponding differences in 5-MeO-DMT production.⁸ The compound appears to be synthesized internally, likely as a chemical defense. Other toad species produce bufotenine (5-OH-DMT), yet another related but distinct tryptamine. The family of tryptamine compounds in amphibians is broad, but calling any of these “DMT” without qualification is misleading. If you are asking specifically about N,N-dimethyltryptamine, the answer centers on mammals, not toads.

What DMT Might Actually Do Inside Animal Bodies

Why would a mammalian brain go to the trouble of making and releasing DMT? That question has been debated for over six decades, and researchers still do not have a definitive answer. A 2022 review summarized the accumulated evidence as strongly suggesting that DMT can function as a neurotransmitter, neuromodulator, hormone, and immunomodulator, and that it plays a role in pregnancy and development.⁹ A separate review reached a similar conclusion, noting increasing evidence that endogenous DMT plays roles in both the peripheral and central nervous systems and may act as a neurotransmitter.¹⁰

One of the more concrete leads involves the sigma-1 receptor. DMT binds to this receptor, and in lab experiments, that binding has shown cytoprotective properties against low-oxygen conditions. A study in rats found that DMT, acting through the sigma-1 receptor, reduced the size of brain damage and improved recovery after a stroke-like event.¹¹ This raises the possibility that one normal function of endogenous DMT is protecting brain cells during oxygen deprivation. If true, the molecule would be less a random metabolic byproduct and more a stress-response tool the brain keeps on hand. But this remains speculative as an explanation for the molecule’s everyday presence, and the concentrations at which protective effects kick in may be higher than what the brain normally maintains.

How Quickly Animals Break DMT Down

Even when administered at high doses, DMT does not last long in a mammalian body. The reason is monoamine oxidase A (MAO-A), an enzyme that chews through DMT rapidly. In human liver tissue, DMT had a half-life of under eight minutes. Blocking MAO-A with a selective inhibitor cut DMT’s breakdown rate by more than ninety percent, extending its half-life from about 34 minutes (at a slightly higher test concentration) to over six hours. Blocking MAO-B, the other form of the enzyme, had essentially no effect.¹²

This fast clearance explains a few things. It is why DMT taken orally is not psychoactive on its own; the gut and liver destroy it before it reaches the brain in meaningful amounts. Traditional ayahuasca preparations solve this problem by combining DMT-containing plants with plants containing MAO inhibitors, effectively disabling the body’s rapid breakdown system. It also suggests that whatever role endogenous DMT plays in the brain, it operates in very short bursts. The brain makes it, uses it, and clears it almost immediately, much like other fast-acting signaling molecules.

What Rodents Do When Given DMT

Since you cannot ask a rat to describe its subjective experience, researchers rely on observable behavior. When rats receive a moderately high dose of DMT (around 10 mg/kg), they display a characteristic set of responses: flat body posture, hind-limb abduction, and signs of acute serotonin overload.¹³ Earlier work with rodents pre-treated with an MAO inhibitor (to slow DMT breakdown and amplify its effects) documented a dose-dependent behavioral syndrome including hyperactivity, prostration, mild tremor, a rigidly raised tail, and sudden jerking movements.¹⁴

Mice given DMT also show the head-twitch response, a reflexive side-to-side head movement that serves as a standard lab indicator for serotonin 2A receptor activation. The dose-response curve for this head-twitch is bell-shaped with DMT, meaning the response increases up to a point and then decreases at higher doses. Blocking the 5-HT2A receptor suppresses the head-twitch, confirming that the behavior is driven through that receptor pathway. Interestingly, even when the head-twitch is blocked, DMT still reduces marble-burying behavior, a test used to screen for anti-compulsive effects, suggesting that different receptor systems mediate different aspects of DMT’s action in animals.⁷

Why Nature Makes These Molecules at All

DMT and related tryptamines show up across a remarkable range of living things: hundreds of plant species, certain fungi, amphibians, and mammals. A 2025 paper in the Proceedings of the National Academy of Sciences proposed an ecological framework for understanding this pattern. The authors argued that these molecules may function as defensive agents or as tools for manipulating the behavior of herbivores and pollinators. By targeting conserved serotonin receptors in the nervous systems of animals that eat or interact with these organisms, tryptamine-producing species could gain a survival advantage.¹⁵

The convergent-evolution angle is worth pausing on. Plants, fungi, toads, and mammalian brains all produce tryptamine derivatives, but they did not inherit this ability from a single common ancestor. Instead, the biosynthetic pathways appear to have arisen independently multiple times, presumably because the underlying chemistry (starting from tryptophan and adding methyl groups) is simple enough that evolution stumbled onto it repeatedly. The serotonin receptors that these compounds target are themselves ancient and highly conserved, present in nearly all animals with a nervous system. When a defensive chemical happens to hit a receptor that virtually every potential predator carries, natural selection tends to keep that chemistry around.

For mammals, though, the ecological-defense explanation does not quite fit. A rat is not trying to deter predators with nanomolar concentrations of DMT in its cortex. The endogenous mammalian story is more likely about the molecule’s role in signaling, stress response, or immune function. These parallel explanations are not in conflict. The same basic molecule can serve different purposes in different kingdoms of life, and the reason it keeps reappearing may simply be that tryptophan is everywhere and the enzymes required to modify it are not hard to evolve.

The Challenge of Measuring Something So Scarce

One reason the list of confirmed DMT-producing animals remains short is that detecting the molecule at endogenous levels is technically demanding. Brain tissue contains hundreds of compounds, many at similar concentrations, and early analytical methods were not sensitive or specific enough to reliably distinguish DMT from chemical look-alikes. Modern approaches use liquid chromatography paired with high-resolution mass spectrometry, applying strict confirmatory criteria so that a positive detection truly represents DMT rather than a co-eluting molecule that happens to fragment in a similar way.⁶

A method developed for rat plasma and brain tissue achieved detection limits of about 0.1 nanograms per milliliter in plasma and 0.2 nanograms per gram in brain, with recovery rates around 88 to 90 percent.¹⁶ Those numbers are impressive, but running this kind of analysis on, say, a wild deer or a dolphin brain is not something that happens routinely. Most analytical work has been done on lab rats for the practical reason that their brains are readily available and the experiments can be tightly controlled. Expanding the confirmed list of DMT-producing animals would require either targeted studies of other species or large-scale comparative metabolomics projects, neither of which is a high funding priority. For now, the reasonable assumption is that most mammals produce endogenous DMT, but the hard proof covers only a few species, and the trace amounts involved make every new confirmation a small technical feat.