Co‐administration of <scp>l</scp>‐cystine and <scp>l</scp>‐theanine enhances efficacy of influenza vaccination in elderly persons: Nutritional status‐dependent immunogenicity

Abstract

Co-administration of l-cystine and l-theanine before vaccination may enhance the immune response to influenza vaccine in elderly subjects with low serum total protein or hemoglobin.