I have taken many pro-hormones in teh past and have also heard about P6 Black. For what I know, you got something that has been discontinued so be religious while you are on it.
Novadex-XT by Gaspari is the best supplement PCT in my opinion. All pretty much do the job, but Novadex has a patent where many others are patent pending.
If you good take Nolvadex and/or Clomid instead that would be very ideal. I however believe you will be fine with Novadex-XT.
If anyone else knows more, all ears.
"For those who have fought for it,
freedom has a taste the protected will never know."
- An American Soldier in Iraq, 2003