A team has shown that the natural substance ergothioneine improves the health span of aging animals. Ergothioneine is a natural compound found in certain fungi such as oyster or shiitake mushrooms as well as fermented foods. The researchers observed that treatment with ergothioneine from young adulthood not only extended the lifespan, but also increased their mobility as well as their resistance to stress and reduced age-related biomarkers. The project partners were also able to observe these positive effects in mammals. For three weeks, they treated six nine-month-old rats with a daily dose of about 10 milligrams of ergothioneine—roughly the same...