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"One of the El Sidron Neanderthals even seemed to be self-medicating with edible plants. One of his teeth had an abscess, and his plaque contained a parasite that causes diarrhea. But the plaque also contained Penicillium, the mould that produces the antibiotic penicillin, and poplar bark, a natural source of the aspirin-like painkiller, salicylic acid."
This was stated in the context of Dr. Weyrich (and team's) investigation of ancient dental plaque.