The human body is immensely complicated, and while we know quite a lot about how it works, there is also a whole lot of grey areas. For reference, we do not fully understand how most drugs work. Most medicines are developed by making some educated guesses about what might work and then doing extensive testing until finding something that actually works with acceptable side effects. Figuring out exactly why it works is nice but strictly speaking isn’t necessary for approval as long as the clinical trials are done to the extent they need to be done. This doesn’t mean we don’t understand how medicine works, we do, but our understanding Isn’t complete.
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