Just some side info if you're not already aware, acetaminophen (Tylenol), ibuprofen (Advil), and aspirin (Bayer) are not all the same thing. Acetaminophen is synthetic and toxic to the liver. Ibuprofen is also synthetic and will burn a hole in your stomach if you ingest it too often for too long, my mom's cousin died from that and my brother almost did. Aspirin is naturally found in the bark of willow trees, and has been used for centuries for its pain-relieving effects.