Home Health-Fitness Oregano – I think of dried oregano leaves as miniature salad greens, Bazilian says. One teaspoon contains not only six micrograms of bone-building vitamin K but also the same amount of antioxidants as three cups of spinach. And preliminary research indicates that oregano can help fend off stomach flu. Bacteria often hitch a ride on the food we eat, and oregano may keep them from multiplying and making us sick, Bazilian says.