GPT and ulcer disease: On gastrointestinal system, decreases in food transit time in the gastrointestinal system as well as aspartate aminotransferase, alanine aminotransferase and lactate dehydrogenase activities were shown for onion and increased growth of useful microorganisms in the colon, anti-spasmodic, anti-diarrheal and anti-ulcer effects, increased amount of gastric mucus and decreased gastric lesions were shown for the plant ingredients mainly quercetin.