There is a substantial thread on this board. As a sleep/recovery aid I've found it to be great. I'm currently taking the NOW brand ZMA which you can look on google/froogle for $10 a bottle which is a month's worth.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."