I think this is true about a lot of medicines, too. I use an allergy medicine very infrequently because I don’t want to be caught in ‘rebound effect’; so I don’t buy a lot of it. It seems to be just as effective when it’s several years ‘expired’.
Same thing with aspirin.
Same thing with aspirin."
Ha, ha. In the 1990s, I inherited a very large bottle of aspirin that had expired in 1987. I still use it and it still works.
It is a very large bottle and I rarely need aspirin.