I used to have horrible digestive problems whenever I traveled. Finally decided that it was because home base was a limestone well of the turn the shower heads into stalactites variety. I was used to drinking this and my stomach was pumping out massive acid to compensate.
I break up a Tums tablet and put it in with the ground coffee before turning the coffeepot on. I've been doing this for so long I've forgotten why. At this point, it's just superstitious behavior. I do know that strong coffee from outside sources will give me a headache.
If you want to see some snake-oil
type ads, watch TV from Over-The-Air sources. Right now, there's an ad on the telly for "Super-Beets," which purport to supply you with nitric oxide for heart health.
Last time I had any beets, years ago, they scared the hell out of me when I looked at my turds the next day.
Not sayin' yea and not sayin' nay on the super beets and nitric oxide, but sayin' I'll wait and see.
Terry