Below are the listed ingredients for some of the major companion bird pellet brands. This information is posted in an article on another bird forum site. Hopefully it may serve us to make wiser pelleted diet decisions for our birds.
The image content is from "Parrot Pellet Comparison Made Easy!" at URL: http://www.africangreyparrotcentre.co.uk/parrot-articles/parrot-pellet-comparison-made-easy/
EDIT:
The ingredients lists above were apparently compiled in 2010. I notice that the current ingredients list supplied on Zupreem Natural packaging shows Menadione sodium bisulfite complex as its Vitamin K source. Whereas it listed Vitamin K supplement on the older packaging - which is likely the same substance that has been specified more clearly on the newer packaging as Menadione sodium bisulfite complex. This is not comforting news because Menadione has been reported to promote liver cancer among test subjects in some studies. It is at the very least controversial.