Essential K also has a very high guaranteed minimum for iron (even for most bagged feeds) at 900 ppm. I went to a seminar a couple years ago with their nutritionist who stated that the company position on any link between IR and excess iron is that it has not been proven and therefore they see no reason to limit the iron. As an aside, I will also say that when I stopped feeding it, my dark bay horse got much darker.
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Jackie and Megan
Palm Bay, FL
Joined March 2018

https://ecir.groups.io/g/CaseHistory/files/Jackie%20and%20Megan