Gas-X’s active ingredient is a chemical called simethicone. Simethicone is an anti-foaming agent, which basically is a chemical that hits gas bubbles in your stomach and intestine, and causes those bubbles to break apart; the specifics of how it does THAT are a separate conversation involving surface tension and stuff that are a little beyond my ability to ELI5, lol.
TL;DR Gas-X hits gas bubbles, bubbles pop more easily.
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