Neanderthals Used Birch Tar for Medicine & Toolmaking, Study Suggests

New research suggests that Neanderthals may have leveraged the medicinal properties of birch tar – a sticky substance derived from birch bark – not just as an adhesive for tools, but also as a treatment for wounds. A study published in PLOS One details how researchers recreated birch tar using methods believed to be employed by Neanderthals and found it possesses antibacterial qualities, specifically inhibiting the growth of Staphylococcus aureus, a common cause of infections.

For decades, archaeologists have understood birch tar as a crucial component in Neanderthal toolmaking. Residue found on stone artifacts pointed to its primary utilize as a “hafting” material – essentially, a glue to bind stone points to wooden shafts for spears or other tools. However, growing evidence of medicinal practices among Neanderthals, coupled with ethnographic findings showing birch tar’s use in traditional medicine across various cultures, prompted researchers to investigate its potential as an early antibiotic.

Beyond Hafting: Exploring Medicinal Uses

The study, led by Tjaark Siemssen of the University of Cologne and Oxford University, alongside researchers from the University of Liège and Cape Breton University in Canada, sought to determine if Neanderthals could have intentionally utilized birch tar’s antibacterial properties. “However, new studies suggest that birch tar may also have been used for other purposes,” Siemssen noted in a press release. The team meticulously recreated birch tar using two methods reconstructed from archaeological evidence. One involved burning birch bark in a sealed pit underground – a process that creates tar through dry distillation in the absence of oxygen. The other involved burning bark next to a stone surface, allowing the tar to condense on the stone.

These methods mirror techniques believed to have been used by Neanderthals, as evidenced by residue patterns found at archaeological sites. The resulting tar samples were then tested against Staphylococcus aureus, a bacterium notorious for causing skin infections, respiratory illnesses and food poisoning. The results were consistent: all tar samples demonstrated the ability to inhibit bacterial growth. What we have is particularly significant given the increasing global challenge of antibiotic resistance, as S. Aureus is now frequently found in multidrug-resistant strains.

Reconstructing the Past: Experimental Archaeology and Antibacterial Properties

The researchers’ approach falls under the umbrella of experimental archaeology – a field that seeks to understand past technologies and behaviors by recreating them. By replicating Neanderthal tar production methods, the team could assess the resulting product’s properties with a higher degree of confidence. The choice of birch species was also crucial; they used species known to have existed during the Pleistocene epoch, the geological period when Neanderthals thrived.

The antibacterial effect wasn’t limited to a single production method. Whether created through underground burning or condensation on stone, the tar consistently demonstrated antimicrobial activity. “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,” explained Siemssen. This suggests Neanderthals weren’t simply stumbling upon a useful adhesive; they may have possessed a practical understanding of birch tar’s medicinal potential.

Implications for Understanding Neanderthal Cognition and Healthcare

This discovery adds to a growing body of evidence suggesting Neanderthals were more sophisticated than previously thought. Prior research has revealed Neanderthals intentionally used plants for medicinal purposes, including evidence of self-medication with poplar sap containing salicylic acid – a precursor to aspirin. The use of birch tar further supports the idea that Neanderthals actively sought out and utilized natural resources to address health issues.

However, it’s important to note the limitations of the study. While the research demonstrates birch tar’s antibacterial properties in vitro (in a laboratory setting), it doesn’t definitively prove Neanderthals applied it to wounds. The study doesn’t address how Neanderthals would have applied the tar, potential side effects, or the extent to which it impacted their overall health. Further research, potentially involving analysis of ancient dental calculus or skeletal remains, could provide more direct evidence of birch tar’s medicinal use.

A Potential Source for Novel Antibiotics?

Beyond shedding light on Neanderthal life, the study’s findings have potential relevance for modern medicine. With the rise of antibiotic-resistant bacteria, researchers are actively searching for new antimicrobial compounds. The rediscovery of birch tar’s antibacterial properties suggests that traditional remedies and prehistoric practices could hold valuable clues. “Our findings show that it might be worthwhile to examine targeted antibiotics from ethnographic contexts – or, as in this case, from prehistoric contexts – in greater depth,” Siemssen concluded.

The next steps involve further investigation into the specific compounds within birch tar responsible for its antibacterial effects. Researchers will likely explore different birch species and extraction methods to optimize the production of these compounds. While birch tar isn’t likely to become a mainstream antibiotic anytime soon, it represents a fascinating example of how ancient knowledge could inform modern medical research. The study, published in PLOS One, opens a new avenue for exploring the medicinal potential of natural substances and understanding the resourcefulness of our Neanderthal ancestors.