The RDA of a particular vitamin or mineral is the amount that people need each day to stay healthy. RDA is an abbreviation for 'recommended daily amount'.
RDA in British English
abbreviation for
1.
Recommended Daily or Dietary Amount or Allowance
2.
(in England) Regional Development Agency
RDA in American English
Recommended Daily (or Dietary) Allowance: the amount of protein, vitamins, etc. suggested for various age groups by the National Food and Nutrition Board