Running may fight heart disease, improve mood, sharpen your mind, and promote weight loss—but it can also cause inflammation that can really kill your legs, hindering recovery.

But Texas A&M researchers have discovered a solution.

For 10 days, they gave 27 endurance runners and triathletes either a placebo or a powder made from the skin of Montmorency tart cherries; on the eighth day, they also had them run a half-marathon. Those who’d been dosing on the tart cherry not only ended up with 47% less inflammation and 34% less soreness, they also busted out finish times that were 13% faster.

The powder, easily available online, tamps down signs of physiological stress and muscle breakdown, they say, in a dose of about a quarter teaspoon a day.

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