Athletes are always on the lookout for a new sports supplement that could give them an edge. And there certainly are some sports supplements that deliver on their promises: creatine and caffeine are two clear examples. But a new supplement is starting to gain traction for its performance benefits: and that’s the humble mushroom. There's now emerging science suggesting that certain functional mushrooms, particularly the varieties of Cordyceps and reishi (also known as Ganoderma lucidum), may o...