The stuff seems good to me. I recently used this year on my outdoor plants because they were looking semi green and a tad lime so I topped dressed all around with this stuff and a couple weeks latter a more uniform and darker green was noticed on my plants. I will continue to use it or any brand as long as it says its COW manure and at the bottom of the bag it does say that. Beware of other companies that only list a product as Manure because most likely it is processed human waste, at least as far as I am aware. So bottom line if it says COW manure then its good and Black Kow says its Cow manure.
The bag I just got of Black Kow says: Total Nitrogen 0.5%, Soluble Potash 0.5%, and Chlorine 1.0% or less, No Iron or Zink was listed.