so, cordyceps is the mushroom / fungus.
here’s the 2 products I narrowed my purchasing down to.
Optygen HP http://www.amazon.com/Optygen-HP-Bottle-of-120/dp/B000WU65TI/ref=sr_1_1?ie=UTF8&qid=1334855520&sr=8-1
I opted for the Cordygen5 based on price. I found a lot of good reviews on it, outside of Amazon. The Optygen HP has lots of great reviews on Amazon. http://supplementreviews.com/millennium-sport/cordygen5 http://reviews.bodybuilding.com/Millennium_Sport/Cordygen5/