Every time I visit Mexico, I always bring liquid GSE. This time, I brought the pills. Even though I took a pill each day, it didn't stop either the stomach flu or food poisoning. Day 3, kaboom. Next time, back to the liquid form. I do think ACV, oil of oregano work better than the GSE for me. Don't forget to take probiotics if you take OofO to repopulate the good bacteria in your gut. This is vital.