vees lahustuv värvuseta aine, sisaldub kõigis valkudes (eriti piima-, liha- ja kalavalgus), asendamatu aminohape, one of nine essential amino acids in humans required for growth and tissue repair and which is supplied by many foods, especially red meats, fish, and dairy products

eluea pikenemine mingi sekkumise tulemusena võrreldes alternatiivse sekkumisega