Sort of, yes. Let's use aspirin for an example. The bark of the white willow(Salix alba) was the basis for aspirin. The active chemical in the bark is salacin, and asprin is the chemical salicylic acid. Chewing on willow bark would indeed relieve pain. The man made compound salicylic acid does too. But the bark of willow offers other benefits besides relieving you of your headache, it also has other properties such as antioxidant, fever reducing, antiseptic, and immune boosting properties. Also, if you were to opt to use willow bark, you can use a smaller dose to get the same results of pain relief. I couldn't find anything on willow bark vs. aspirin and the stomach issues normally associated with aspirin. I suspect(but am not sure) that willow bark would be gentler on the system too. Nature tends to do things better than man. I'll stop here then. I guess the title of the thread about being free to question mislead me.