I was very bothered when I saw a tshuvah from R Shrirah Gaon saying not to follow the medicinal remedies from Chazal unless you have first researched them since Chazal were not doctors.
Later though, I saw the Ramchal in his psichah l’agodos chazal that says that Chazal would often give over a secret through a mashal. For the purpose of the mashal Chazal often used a scientific or medicinal idea that was accepted in there time. However since it was only a mashal the truth of the statement did not matter to them. ?? ???? ??? ????