Sure, but you get them in your food. Look, I don't tell people not to take supplements For one thing, that approach never seems to work. Telling someone not to take something seems to have the opposite effect.
But other than creatine, most supplements don't really do what they say they're supposed to do. Take whey protein, for instance. Yes, it does induce protein synthesis. No, there is no hard evidence that protein synthesis actually promotes muscle growth long-term.
Remember that Placebo Effect is a powerful phenomenon. My wife where's those stupid copper bracelets. She acknowledges that it's probably bullshit, but swears that she feels better when she wears them.