Long before the age of antibiotics, Neanderthals may have carried medicine in their toolkits without knowing it. Researchers from four universities have found that birch tar — the prehistoric adhesive used to bind stone blades to wooden handles — inhibits the growth of Staphylococcus aureus, a bacterium responsible for serious wound infections. The discovery does not confirm intentional medical use, but it deepens a growing portrait of Neanderthals as beings who engaged meaningfully with the natural world, and it quietly reminds us that ancient wisdom and modern necessity may yet find common g
Neanderthals may have wielded birch tar as prehistoric antibiotic
Sticky substance made from bark may have been medicine thousands of years before antibiotics
Mark
So they're saying Neanderthals were using birch tar as an antibiotic? That seems like a big leap from finding it on old tools.
Mimi
Not quite—they're saying it's possible. The tar definitely has antibacterial properties when tested in the lab. But whether Neanderthals actually used it on wounds is still an open question.
Luke
Right, and that's important to hold. The lab results are solid—every sample inhibited the bacteria. But the leap from "this substance has properties" to "they used it medically" is still inference based on other evidence of Neanderthal medical practices.
Mark
What other evidence?
Mimi
Archaeological findings showing they used plants and practiced some form of medical care. Combined with the fact that birch tar was clearly important to them—they used it for tools—it's reasonable to ask whether they recognized other uses.
Luke
But we should be clear: this study doesn't find birch tar on a wound or in a medicinal context. It finds that the substance they made has the right properties. That's the actual discovery.
Mark
Does it matter which production method they used?
Mimi
That's actually one of the more interesting findings. Both techniques—the underground pit method and the simpler surface burning—produced tar with the same antibacterial effect. So if Neanderthals did use it medically, they didn't need to perfect one specific technique.
Luke
Though again, we don't know if they were intentional about it or if it was incidental. The properties are there; the intention is still archaeology, not biology.
Mark
What about the modern medicine angle? Is this actually useful for us?
Mimi
Potentially. Antibiotic resistance is a real problem, so looking at ancient materials and traditional practices for new compounds makes sense.
Luke
But Siemssen is careful here—he says lab results don't mean it would be safe or effective on human wounds. That's a much longer road. This is a starting point, not a solution.
Il Polso
- A substance Neanderthals used to make tools turns out to inhibit one of today's most dangerous and antibiotic-resistant bacteria.
- Researchers recreated multiple Neanderthal-era birch tar production methods and found every single sample carried the same antibacterial effect — regardless of technique.
- The findings stop short of proof: no direct evidence yet confirms Neanderthals applied tar to wounds, leaving the medical interpretation as compelling but contested speculation.
- The stakes extend well beyond prehistory — as antibiotic resistance escalates into a global crisis, ancient materials and practices are being reconsidered as potential sources of new treatments.
- Scientists urge caution, noting that laboratory inhibition of bacteria does not guarantee the substance is safe or effective on living human tissue without further study.
Long before the age of antibiotics, Neanderthals may have carried medicine in their toolkits without knowing it. Researchers from four universities have found that birch tar — the prehistoric adhesive used to bind stone blades to wooden handles — inhibits the growth of Staphylococcus aureus, a bacterium responsible for serious wound infections. The discovery does not confirm intentional medical use, but it deepens a growing portrait of Neanderthals as beings who engaged meaningfully with the natural world, and it quietly reminds us that ancient wisdom and modern necessity may yet find common ground.
For decades, archaeologists understood birch tar as Neanderthal glue — a sticky extract from bark used to fasten stone blades to wooden handles. A new study suggests the material may have had a second life as medicine. Researchers from the University of Cologne, Oxford, the University of Liège, and Cape Breton University tested whether birch tar carried antibacterial properties, and their results were striking.
The team recreated two production methods supported by archaeological evidence. One involved sealing birch bark in an underground pit and heating it with minimal oxygen, producing tar through dry distillation. The other was simpler: burning bark near a stone surface so that tar vapors condensed into a sticky residue. Both approaches used tree species available during the Neanderthal era, and both yielded material with consistent properties.
Every sample tested inhibited the growth of Staphylococcus aureus — a bacterium that causes serious wound infections and, in some modern strains, resists multiple antibiotics. The effect held across all production techniques, suggesting the antibacterial quality was intrinsic to the material itself, not an artifact of any particular method.
Lead researcher Tjaark Siemssen is careful to note that the experiments do not prove Neanderthals used tar medicinally — that remains an inference, not a certainty. But the findings align with a broader body of archaeological evidence pointing to Neanderthal use of plants for healing and a capacity for deliberate medical care. The research adds texture to an evolving understanding of Neanderthals as resourceful, perceptive inhabitants of their world.
The implications reach into the present. As antibiotic resistance grows more urgent, scientists are looking in unexpected places for new solutions. Siemssen cautions that laboratory results do not automatically translate to clinical safety, and further research would be needed before any practical application could be considered. Still, the study opens a quiet but significant door: the possibility that answers to modern medical crises may be waiting in the practices of our most ancient predecessors.
Archaeologists have long known that Neanderthals used birch tar—a sticky substance extracted from bark—to glue stone blades onto wooden handles, making their tools more effective and durable. What they may not have recognized is that the same material could have served as medicine. A team of researchers from the University of Cologne, Oxford, the University of Liège, and Cape Breton University set out to test whether birch tar possessed antibacterial properties, and what they found suggests that Neanderthals may have been treating wounds with a natural antibiotic thousands of years before modern medicine existed.
The researchers recreated two production methods that archaeological evidence suggests Neanderthals employed. In one technique, they sealed birch bark inside an underground pit and heated it with minimal oxygen, allowing the material to break down through dry distillation and release tar that could be collected. In the other, simpler approach, they burned birch bark near a stone surface, where the tar vapors condensed into a sticky residue. Both methods produced usable material from tree species that existed during the Neanderthal era, allowing the team to test whether the substance would have had consistent properties regardless of how it was made.
When the researchers tested every sample of birch tar they produced, each one inhibited the growth of Staphylococcus aureus, a bacterium commonly responsible for serious wound infections. This finding held true across all the different production techniques, suggesting that the antibacterial effect was not dependent on any single method of extraction. Staphylococcus aureus is particularly significant in modern medicine because certain strains have developed resistance to multiple antibiotics, making infections caused by this bacterium difficult to treat in hospital settings.
The experiments do not prove that Neanderthals actually applied birch tar to wounds—that remains speculation based on circumstantial evidence. What they do demonstrate is that the material Neanderthals were capable of producing possessed properties that could have made it useful for medical purposes. Tjaark Siemssen, who led the study, notes that the findings align with growing archaeological evidence suggesting that Neanderthals used plants for medicinal purposes and practiced forms of medical care. The discovery adds another layer to the emerging portrait of Neanderthals as resourceful humans who understood and exploited the natural world around them.
Beyond what it reveals about prehistoric human behavior, the research carries implications for modern medicine. As antibiotic resistance becomes an increasingly urgent global health concern, scientists are searching for new substances that could help combat infections. The antibacterial activity of ancient birch tar suggests that traditional medicinal practices and materials used thousands of years ago may warrant closer scientific examination. However, Siemssen cautions that the ability to inhibit bacteria in a laboratory setting does not automatically translate to safety or effectiveness when applied to human wounds. Further research would be necessary before any such application could be considered. Still, the findings point toward a direction worth pursuing: that the medical knowledge embedded in ancient practices and materials might offer clues for addressing modern health challenges.
Citazioni salienti
The findings suggest that antimicrobial properties played a role as far back as the time of the early Neanderthals and could have been used in a targeted manner— Tjaark Siemssen, University of Cologne and Oxford University
It might be worthwhile to examine targeted antibiotics from ethnographic contexts—or, as in this case, from prehistoric contexts—in greater depth— Tjaark Siemssen
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