I have sheltons broth, it has no added salt. It tastes nasty on it's own though but is great in cooking.

Making your own really is best. The boulion cubes have aton of sodium as well as transfats. Many brothes, even low sodium ones, can have 25% of your daily sodium intake per serving.

I made a great broth the other night as a base for a soup. I picked up beef marrow bones as well as some pork neck bones. I added some left over lamb bones, then let the whole thing simmer in a gient stock pot on the stove over night. It turned out great and I saved some in the freezer for the next time I make soup.