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Estimated Average Requirement (EAR) and Recommended Dietary Allowance (RDA) for amino acids (protein) for healthy adults 19 y and older, mg/kg/day:

  • Estimated Average Requirement (EAR): average, estimated to meet the requirements of 50%.
  • Recommended Dietary Allowance (RDA): average, sufficient to meet the nutrient requirements of nearly all.
Amino Acids EAR RDA
phenylalanine + tyrosine 27 33
valine 19 24
threonine 16 20
tryptophan 4 5
methionine + cysteine 15 19
leucine 34 42
isoleucine 15 19
lysine 31 38
histidine 11 14
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Isaac Bashevis Singer

What do they know-all these scholars, all these philosophers, all the leaders of the world - about such as you? They have convinced themselves that man, the worst transgressor of all the species, is the crown of creation. All other creatures were created merely to provide him with food, pelts, to be tormented, exterminated. Apple