Could Neanderthals Have Used Birch Tar on Wounds?

Did Neanderthals use birch tar as medicine?

There is no proof that they did. Researchers recreated birch tar using methods thought to resemble ancient production and found that the material inhibited bacterial growth in laboratory tests ¹². This makes wound care a possible use, not a documented Neanderthal practice.

Birch tar has usually been discussed as a sticky material for joining parts of tools. The new results raise another possibility: it may also have affected bacteria associated with infected wounds ¹². The experiment tells us about the material's behavior, not what Neanderthals intended to do with it.

What is birch tar, and how did researchers make it?

Birch tar is a thick, sticky substance created by heating birch bark ¹². Archaeologists have found traces of it at Neanderthal sites, including on stone tools, where it is associated with fastening stone pieces to wooden handles ².

To study it, researchers recreated production approaches based on archaeological evidence. One approach heated bark in a covered pit with little oxygen. Another involved burning bark close to a hard surface ². The researchers then tested the resulting material in the laboratory.

What did the tests show about bacteria?

The experiments found that the recreated tar inhibited bacterial growth. Reports specifically identify Staphylococcus aureus, a bacterium often associated with wound infections, as one affected organism ¹².

This is evidence of an effect in laboratory conditions. It does not show that birch tar would prevent or treat an infection in a person, or that it would help a wound heal. Those are different questions from whether a sample can limit bacterial growth in a test.

Does this prove birch tar was an ancient antibiotic?

No. The findings suggest a possible antibacterial property, but they do not establish that Neanderthals recognized that property or used tar to treat injuries ¹². Describing it as an ancient antibiotic goes beyond what the experiments demonstrate.

The research also does not establish that tar is safe to apply to a human wound. The report covering the findings explicitly notes that laboratory results are not proof of historical use or safety ². The cautious conclusion is that the material may have had medicinal potential, while its actual use remains unknown.

What do these findings say about Neanderthal technology?

The tar findings add a possible function to a substance already linked to tool construction. They do not change the basic evidence that tar could serve as an adhesive, and they do not show that Neanderthals used it for every suggested purpose ¹².

A separate report describes preserved wooden objects from Abric Romaní and says Neanderthals used wood for spears and shelter structures over a period from 62,000 to 40,000 years ago ³. That evidence offers a separate glimpse of their material skills. It is not evidence about medicinal tar use.

What remains unknown about Neanderthal wound care?

The central unanswered question is whether Neanderthals put birch tar on wounds at all. The laboratory experiment cannot establish past behavior, and the supplied reporting identifies no direct evidence that they did so ².

It is also unclear from these sources how well the test results might apply to a real wound, or whether the substance would be safe in that setting. For now, the work points to a testable possibility, not a confirmed treatment or a recommendation for modern use.