I think it depends on the person too Viv. If that works for you, you are lucky to have found your amount. I think that little bit I took wouldn't bother another person, but yet, to someone else, it's od time!! We have to be vigilant about these over-the-counter. I know I was under the belief if it wasn't a prescription, it couldn't hurt you, for years growing up anyway. I'm reading more all the time because I also started hearing people say that we have to be aware of our own systems, because a doctor only knows so much (some of them will just give you the latest sample they have in their office and send you off to croak for all they know).
No, it does not depend on the person. That is the official dosage level for anybody....anything over that is an overdose; full stop.
it may not harm you once with aspirin; but try it for a day or to with Tylenol and you may well be dead.
As for stomach problems....affects some; not others; doesn't bother me..