There are all kinds of examples of where the isomers of common compounds are bad for you, i.e. https://www.sciencealert.com/some-drugs-have-mirror-image-chemica

There are all kinds of examples of where the isomers of common compounds are bad for you, i.e. https://www.sciencealert.com/some-drugs-have-mirror-image-chemical-structures-and-the-wrong-one-can-be-harmful https://www.sciencealert.com/some-drugs-have-mirror-image-ch...