Long ago, people chewed on tree bark as a method of pain relief. Willow bark has a high amount of salicylic acid, an ingredient still used in aspirin today.

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Long ago, people chewed on tree bark as a method of pain relief. Willow bark has a high amount of salicylic acid, an ingredient still used in aspirin today. - Did You Know?

Did You Know?

Long ago, people chewed on tree bark as a method of pain relief. Willow bark has a high amount of salicylic acid, an ingredient still used in aspirin today.