At the low end of the spectrum are branched chain amino acids – only 1% of their content is utilized by the body with 99% resulting in waste that your body must then process and eliminate. Whey and soy proteins – only 18% or less of their content is utilized by the body with 83 ...At the low end of the spectrum are branched chain amino acids – only 1% of their content is utilized by the body with 99% resulting in waste that your body must then process and eliminate. Whey and soy proteins – only 18% or less of their content is utilized by the body with 83% leaving as waste.