Protein Supplement Guide

One measure of a protein’s use in nutrition is called the Biological Value, or BV scale.  This Biological Value method dates back to 1911 and relies on nitrogen retention when measuring the quality of the protein.

Soybean protein isolate has a BV value of 74.

According to the publication released in 1972 called Soybeans:  Chemistry and Technology, soy protein that has been highly refined and isolated has a rough average biological value of 72.  This contracts drastically with the biological value of soybean milk at 91, whole soybeans at 97, whole eggs at 97, and the milk that comes from a cow at 90.