The world of proteins and manufacturers hype associated with its sale is huge and growing. For instance, I've seen manufacturers promoting their particular proteins with a Biological Value (BV) of over 100 ( The Biological Value (BV) is a scale of measurement used to determine what percentage of a given nutrient source is utilized by the body. The theoretical highest BV of any food source is 100%. The scale is most frequently applied to protein sources, particularly whey protein).