Wondering if anyone can help clarify. Just got some foreign and domestic, and as with other posts, the domestic bottles are smaller, no exp date/lot#, and the tops say flip off. The foreign are larger, have exp/date and tops say nothing. I have read on forums that there "is a reason" but nobody talks about the reason. I am just wondering if there is a quality difference, is one better? bogus? etc? any help is appreciated