Google Gemini is telling me: "Saccharin is absorbed primarily in the stomach, with about 85% to 95% of ingested saccharin absorbed and eliminated in the urine.

Google Gemini is telling me: "Saccharin is absorbed primarily in the stomach, with about 85% to 95% of ingested saccharin absorbed and eliminated in the urine." If this is the case, then why hasn't the antibiotic effect been previously observed in vivo? Is the concentration too low?