Anyone ever heard of L-Ergothioneine ?

While conducting some online research for a paper I have due tomorrow I came across an interesting topic: "Improvement of joint range of motion (ROM) and reduction of chronic pain after consumption of an ergothioneine-containing nutritional supplement"

As you probably guessed my paper is going to be on the role of nutrition in Fibromyalgia, myofascial pain, and other chronic pain syndromes. So far I've come across some very interesting peer-reviewed studies, but not nearly as many as there should be and most were small studies. We definitely need to do more large-scale research studies on this topic. Here is the link to the abstract for those interested:

http://www.sciencedirect.com/science/article/pii/S0091743512000448

I worked with synthetic ergothioneine a couple of years ago and its a very interesting compound. A specific transporter for the molecule exists in humans and mutations in the transporter are correlated with diseases like Crohn's and IBS, suggesting this compounds metabolism is associated with them. Its not a vitamin technically because there is no observable deficiency, its retained tenaciously in red blood cells and a few other places and comes into our diets largely through eating fungi. Many mushrooms contain relatively large amounts of ergothioneine and recent evidence suggests many bacteria also produce ergo.