I have a small stomach upset atm, and we have some Andrews' Salts (I think it's salts, it's like milk of magnesia for those of you who don't know it) but the use-by date is a bit gone by now, and I'm wondering if it's safe to take some of it, or better to get a new lot, I've so far erred on the side of caution although I do know that apparently in the 20s and 30s there were no such thing as use by dates.