Giving you the benefit of the doubt, I think you mean mean that everything has side effects, not that everything has actual ill effects. But even then, not ever

Giving you the benefit of the doubt, I think you mean mean that everything has side effects, not that everything has actual ill effects. But even then, not everything has measurable side effects. There is a common saying of "the dose makes the poison" for a reason. I'll leave it up to you to think up some examples, they are innumerable.