so, cordyceps is the mushroom / fungus.
here’s the 2 products I narrowed my purchasing down to.
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/