Difference between nutrition and supplement labels

I've seen them many times on my vitamins,  protein powders, etc.  On some protein powders there is even their proprietary ingedient formula, but it breaks it out as to not divulge their secret formula.  One place I noticed that has a nutritional label is on my EAS Myoplex.  As it turns out there is a difference in labeling of actual fooda and supplements.  For a quick read, you can find it here.

http://www.fda.gov/AboutFDA/Transparency/Basics/ucm194357.htm

http://www.whichsupps.com/nutrition/advice/the-true-meaning-about-what-a-proprietary-blend-is-in-supplements.html