In general, no. Preservatives keep things like bacteria (which are *much more likely* to be bad for you) away, so they’re an overall win.
Every preservative has a specific percentage that it’s intended to be used at. If someone used a crapton more than that, then it might start to get dangerous – in exactly the same way that water can theoretically be toxic if you drink a crapton too much of it. The simple solution, of course, being *don’t do that*.
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