recommended daily allowance

noun

rec·​om·​mend·​ed dai·​ly al·​low·​ance ˌrek-ə-ˌmend-əd-ˌdā-lē-ə-ˈlau̇-ən(t)s 

variants or recommended dietary allowance

often capitalized R&D&A

: the amount of a nutriment (as a vitamin or mineral) that is recommended for daily consumption by the Food and Nutrition Board of the National Academy of Sciences

—abbreviation RDA