It should also be noted that all medicine essentially comes from natural sources such as herbs. The difference with conventional medicine is that the the active ingredient is extracted, purified, synthesized and tested to be sure it works. A lot of herbal treatments do work because those herbs are the source of some much more effective conventional medicines. They're just less pure and under no legal controls to ensure that they're safe and effective. So they can work, but buyer beware.
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"If knowledge can create problems, it is not through ignorance that we can solve them." - Isaac Asimov