# Biological value

> One method of measuring the "quality" of protein, devised by H. H. Mitchell.

One method of measuring the "quality" of <protein>, devised by <H. H. Mitchell>.

It measures nitrogen retained in the body after protein intake to determine how efficiently the protein was used. However, there was no evidence then, nor is there now, for the claim that nitrogen can measure protein efficiency.

It is rarely used today.