An article shows that melatonin, despite its antioxidant effects and role in regulating sleep cycles, can worsen inflammation of the intestine and impair the action of gut microbiota. Melatonin is popularly known as the "sleep hormone" and is often taken as a so-called food supplement without a doctor's prescription by people with sleep problems. "It's generally thought to be harmless. However, our study shows that the ingestion of melatonin supplement can have adverse effects on health," said Cristina Ribeiro de Barros Cardoso. Melatonin can act as an antioxidant and improve several physiological or pathological conditions. "We started out in this...