Menadione In Pet Foods

Some of you know I've lost two cats to cancer in just over a year's time.  I recently found out that the food I have been feeding them for years (Purina ONE as well as their wet canned foods) contains a synthetic vitamin K precursor supplement called menadione (menadione sodium bisulfite complex).  It seems this substance has been implicated as a carcinogen (among other things) in cats and dogs; the FDA has banned it as an additive in food products for people as well as in vitamin supplements.  Unfortunately it is used in a lot of brand-name cat/dog foods and treats.

I can't be sure one way or another if this was the cause of my two cats' untimely demise, but I do know I am done with any cat food brands that use it.

On the topic:

http://www.dogfoodproject.com/index.php?page=menadione

http://www.dogsnaturallymagazine.com/the-only-approved-vitamin-k-supplement-in-pet-food/