Drinking vinegar does not lower your blood pressure.
Nor does it kill lice, banish girl cooties, cure diabetes, lower cholesterol, cure arthritis, make your boobs sag less or make your talleywhacker bigger.
I don’t care if your cousin’s girlfriend’s brother’s auntie swears it cured the kid of gout and helped him kick his crack habit, there is no scientific evidence supporting the practice.
I suppose it’s plausible, however, that if you chased a glass of vinegar with a pixie stick, you could conceivably dye Easter eggs on your tongue. That talent alone might make you a hit at parties, and possibly be enough to cover the fact that you are otherwise a gullible dumbass.