What is Deer Antler Spray Anyway?

This week a new drug was introduced into the performance enhancing substance arena. It's called Deer Antler spray and it's actually made from Deer Antlers and designed to build muscle. In the media frenzy leading up the to the Super Bowl there were accusations that Ray Lews used the spray (he denies it) and an admission of using the spray from golfer Vijay Singh. (Singh to using it but says he didn't know it had a banned substance).The Bleacher Report has a nice blog post that answers the question, "What is This Stuff?"