Estimated Average Requirement (EAR) and Recommended Dietary Allowance (RDA) for amino acids (protein) for healthy adults 19 years and older, mg/kg/day:
- Estimated Average Requirement (EAR): average, estimated to meet the requirements of 50% of people.
- Recommended Dietary Allowance (RDA): average, sufficient to meet the nutrient requirements of nearly all.
Amino Acids EAR and RDA:
- Phenylalanine + Tyrosine - 27 / 33
- Valine - 97 / 24
- Threonine - 16 / 20
- Tryptophan - 4 / 5
- Methionine + cysteine - 15 / 19
- Leucine - 34 / 42
- Isoleucine - 15 / 19
- Lysine - 31 / 38
- Histidine - 11 / 14
Other estimates of Amino Acid Requirements for adults, mg / kg per day
- Phenylalanine + tyrosine: 14
- Valine: 10
- Threonine: 7
- Tryptophan: 3.5
- Methionine + cystine: 13
- Leucine: 14
- Isoleucine: 10
- Lysine: 12
- Histidine: 8–12
