I found this of interest, and never knew it... passing it on

How do I know if other protein drinks or bars use high quality protein or not?

The FDA says that any manufacturer which makes a bar with a protein claim (for example, "Now with 33g of protein," "High Protein Bar," etc.) must list the percent Daily Value (%DV) on the back of its package. The % DV tells you how much of the Recommended Daily Allowance (RDA) for protein the bar is providing. The FDA currently recommends 50g of protein per day.
To determine if a bar contains high quality protein, take a look at the Nutrition Facts panel on the back of the wrapper. There will be a row that lists the total grams of protein contained in that bar. Legally, there should also be a % DV listed next to the total number of grams.
If the bar does have a % DV listed, you can determine if the protein is high quality by the following method: Take the total number of protein grams (for example - 33g) and divide that by the FDA's RDA for protein of 50g. The % DV then should be 66%. If the % DV listed on the bar is lower, then the protein is not high quality. If your bar does not have a % DV listed, be cautious because that may also indicate that the protein is of poor quality.

PALEO PROTEIN BARS

http://www.marksdailyapple.com/primal-energy-bar-redux/