"What did they test? Store brands? Because they mention "Spring Valley" and I don't know if that is a WalMart brand or a nation wide brand."
This raises the question of who is ULTIMATELY responsible. My impression is that a so-called "store brand" is actually manufactured by an independent company that has a deal with a retailer to put the retailers label on it. In other words, Wal-Mart and Walgreens aren't the ones manufacturing these products, they are the ones selling them.
Now, if independent research shows that the products are not what the manufacturers claim they are, the retailers should stop selling them, but isn't the real liability with the manufacturer?
You are partly right about store brands or "private label" in that they are made by independent manufacturer. But the recipe is given or cleared by the person who's name is going to be on the label. The manufacture also must clear with the people he is manufacturing for any changes.
Now of course there is the question of who supplies the ingredients and what, if any quality assurance is done on them.
I used to make food bars. We did QC on the ingredients we bought and did COA's on the final product showing that the bars were free of mold, e.Coil, salmonella, run through a metal detector, were within the weight, protein and fat specs given.
But often we were given a special nutrient blend that we were to include in the bars. Other then to check it for harmful micro organisms we did not check that.
It could have been pure wheat flour for all we knew.