Definitions:

Estimated Average Requirement (EAR): The average daily nutrient intake level that
is estimated to meet the requirements of half of the healthy individuals in a particular life
stage and gender group.

Recommended Dietary Allowance (RDA): The average daily dietary nutrient intake
level that is sufficient to meet the nutrient requirements of nearly all (97-98 percent)
healthy individuals in a particular life stage and gender group.

Adequate Intake (AI): The recommended average daily intake level based on observed
or experimentally determined approximations or estimates of nutrient intake by
a group (or groups) of apparently healthy people that are assumed to be adequate;
used when an RDA cannot be determined.

Tolerable Upper Intake Level (UL): The highest average daily nutrient intake level
that is likely to pose no risk of adverse health effects to almost all individuals in the
general population. As intake increases above the UL, the potential risk of adverse
effects may increase.

Source:
Dietary Reference Intakes For Energy, Carbohydrate, Fiber, Fat, Fatty Acids,Cholesterol, Protein,and Amino Acids, Institute of Medicine of the National Academies, 2002 and 2005, THE NATIONAL ACADEMIES PRESS 500 Fifth Street, N.W. Washington, DC 20001

 

Classification of amino acids.

arrow Additional information can be found here.

Indispensable  Dispensable  Conditionally
Indispensable 
Precursors of Conditionally  Indispensable 
Conditionally indispensable is defined as requiring a dietary source when endogenous
synthesis cannot meet metabolic need.   Although histidine is considered indispensable, unlike the other eight indispensable amino acids, it does not fulfill the criteria of reducing protein deposition and inducing negative nitrogen balance promptly upon removal from the diet.
Histidine Alanine Arginine Glutamine/glutamate, aspartate
Isoleucine Aspartic acid Cysteine Methionine, serine
Leucine Asparagine Glutamine Glutamic acid/ammonia
Lysine Glutamic acid Glycine Serine, choline
Methionine Serine Proline Glutamate
Phenylalanine Tyrosine Phenylalanine
Threonine
Tryptophan
Valine

 

Source:
Dietary Reference Intakes For Energy, Carbohydrate, Fiber, Fat, Fatty Acids,Cholesterol, Protein,and Amino Acids, Institute of Medicine of the National Academies, 2002 and 2005, THE NATIONAL ACADEMIES PRESS 500 Fifth Street, N.W. Washington, DC 20001

 

RDA and EAR recommendations for essential amino acids.

 

Source:
Dietary Reference Intakes For Energy, Carbohydrate, Fiber, Fat, Fatty Acids,Cholesterol, Protein,and Amino Acids, Institute of Medicine of the National Academies, 2002 and 2005, THE NATIONAL ACADEMIES PRESS 500 Fifth Street, N.W. Washington, DC 20001

 

AI for Infants Ages 0 through 6 Months

0-6 months
214 mg/d or 36 mg/kg/day of histidine
529 mg/d or 88 mg/kg/day of isoleucine
938 mg/d or 156 mg/kg/day of leucine
640 mg/d or 107 mg/kg/day of lysine
353 mg/d or 59 mg/kg/day of methionine +cysteine
807 mg/d or 135 mg/kg/day of phenylalanine + tyrosine
436 mg/d or 73 mg/kg/day of threonine
167 mg/d or 28 mg/kg/day of tryptophan
519 mg/d or 87 mg/kg/day of valine

Infants Ages 7 through 12 Months

EAR for 7-12 mo
22 mg/kg/day of histidine
30 mg/kg/day of isoleucine
65 mg/kg/day of leucine
62 mg/kg/day of lysine
30 mg/kg/day of methionine + cysteine
58 mg/kg/day of phenylalanine + tyrosine
34 mg/kg/day of threonine
9 mg/kg/day of tryptophan
39 mg/kg/day of valine

RDA for 7-12 mo
32 mg/kg/day of histidine
43 mg/kg/day of isoleucine
93 mg/kg/day of leucine
89 mg/kg/day of lysine
43 mg/kg/day of methionine + cysteine
84 mg/kg/day of phenylalanine + tyrosine
49 mg/kg/day of threonine
13 mg/kg/day of tryptophan
58 mg/kg/day of valine

Children Ages 1 through 3 Years

EAR for 1-3 y
16 mg/kg/day of histidine
22 mg/kg/day of isoleucine
48 mg/kg/day of leucine
45 mg/kg/day of lysine
22 mg/kg/day of methionine + cysteine
41 mg/kg/day of phenylalanine + tyrosine
24 mg/kg/day of threonine
6 mg/kg/day of tryptophan
28 mg/kg/day of valine
RDA for 1-3 y
21 mg/kg/day of histidine
28 mg/kg/day of isoleucine
63 mg/kg/day of leucine
58 mg/kg/day of lysine
28 mg/kg/day of methionine + cysteine
54 mg/kg/day of phenylalanine + tyrosine
32 mg/kg/day of threonine
8 mg/kg/day of tryptophan
37 mg/kg/day of valine

Children Ages 4 through 8 Years

EAR for 4-8 y
13 mg/kg/day of histidine
18 mg/kg/day of isoleucine
40 mg/kg/day of leucine
37 mg/kg/day of lysine
18 mg/kg/day of methionine + cysteine
33 mg/kg/day of phenylalanine + tyrosine
19 mg/kg/day of threonine
5 mg/kg/day of tryptophan
23 mg/kg/day of valine

RDA for 4-8 y
16 mg/kg/day of histidine
22 mg/kg/day of isoleucine
49 mg/kg/day of leucine
46 mg/kg/day of lysine
22 mg/kg/day of methionine + cysteine
41 mg/kg/day of phenylalanine + tyrosine
24 mg/kg/day of threonine
6 mg/kg/day of tryptophan
28 mg/kg/day of valine

Boys Ages 9 through 13 Years

BOYS
EAR for 9-13 y
13 mg/kg/day of histidine
18 mg/kg/day of isoleucine
40 mg/kg/day of leucine
37 mg/kg/day of lysine
18 mg/kg/day of methionine + cysteine
33 mg/kg/day of phenylalanine + tyrosine
19 mg/kg/day of threonine
5 mg/kg/day of tryptophan
23 mg/kg/day of valine

BOYS
RDA for 9-13 y
17 mg/kg/day of histidine
22 mg/kg/day of isoleucine
49 mg/kg/day of leucine
46 mg/kg/day of lysine
22 mg/kg/day of methionine + cysteine
41 mg/kg/day of phenylalanine + tyrosine
24 mg/kg/day of threonine
6 mg/kg/day of tryptophan
28 mg/kg/day of valine

Girls Ages 9 through 13 Years

GIRLS
EAR for 9-13 y
12 mg/kg/day of histidine
17 mg/kg/day of isoleucine
38 mg/kg/day of leucine
35 mg/kg/day of lysine
17 mg/kg/day of methionine + cysteine
31 mg/kg/day of phenylalanine + tyrosine
18 mg/kg/day of threonine
5 mg/kg/day of tryptophan
22 mg/kg/day of valine

GIRLS
RDA for 9-13 y
15 mg/kg/day of histidine
21 mg/kg/day of isoleucine
47 mg/kg/day of leucine
43 mg/kg/day of lysine
21 mg/kg/day of methionine + cysteine
38 mg/kg/day of phenylalanine + tyrosine
22 mg/kg/day of threonine
6 mg/kg/day of tryptophan
27 mg/kg/day of valine

Boys Ages 14 through 18 Years

BOYS
EAR for 14-18 y
12 mg/kg/day of histidine
17 mg/kg/day of isoleucine
38 mg/kg/day of leucine
35 mg/kg/day of lysine
17 mg/kg/day of methionine + cysteine
31 mg/kg/day of phenylalanine + tyrosine
18 mg/kg/day of threonine
5 mg/kg/day of tryptophan
22 mg/kg/day of valine

BOYS
RDA for 14-18 y
15 mg/kg/day of histidine
21 mg/kg/day of isoleucine
47 mg/kg/day of leucine
43 mg/kg/day of lysine
21 mg/kg/day of methionine + cysteine
38 mg/kg/day of phenylalanine + tyrosine
22 mg/kg/day of threonine
6 mg/kg/day of tryptophan
27 mg/kg/day of valine

Girls Ages 14 through 18 Years

GIRLS
EAR for 14-18 y
12 mg/kg/day of histidine
16 mg/kg/day of isoleucine
35 mg/kg/day of leucine
32 mg/kg/day of lysine
16 mg/kg/day of methionine + cysteine
28 mg/kg/day of phenylalanine + tyrosine
17 mg/kg/day of threonine
4 mg/kg/day of tryptophan
20 mg/kg/day of valine

GIRLS
RDA for 14-18 y
14 mg/kg/day of histidine
19 mg/kg/day of isoleucine
44 mg/kg/day of leucine
40 mg/kg/day of lysine
19 mg/kg/day of methionine + cysteine
35 mg/kg/day of phenylalanine + tyrosine
21 mg/kg/day of threonine
5 mg/kg/day of tryptophan
24 mg/kg/day of valine

Adults Ages 19 Years and Older

EAR FOR ADULTS
19 y and older
11 mg/kg/day of histidine
15 mg/kg/day of isoleucine
34 mg/kg/day of leucine
31 mg/kg/day of lysine
15 mg/kg/day of methionine + cysteine
27 mg/kg/day of phenylalanine + tyrosine
16 mg/kg/day of threonine
4 mg/kg/day of tryptophan
19 mg/kg/day of valine

RDA FOR ADULTS
19 y and older
14 mg/kg/day of histidine
19 mg/kg/day of isoleucine
42 mg/kg/day of leucine
38 mg/kg/day of lysine
19 mg/kg/day of methionine + cysteine
33 mg/kg/day of phenylalanine + tyrosine
20 mg/kg/day of threonine
5 mg/kg/day of tryptophan
24 mg/kg/day of valine

Pregnancy

EAR FOR PREGNANCY
For all ages
15 mg/kg/day of histidine
20 mg/kg/day of isoleucine
45 mg/kg/day of leucine
41 mg/kg/day of lysine
20 mg/kg/day of methionine + cysteine
36 mg/kg/day of phenylalanine + tyrosine
21 mg/kg/day of threonine
5 mg/kg/day of tryptophan
25 mg/kg/day of valine

RDA FOR PREGNANCY
For all ages
18 mg/kg/day of histidine
25 mg/kg/day of isoleucine
56 mg/kg/day of leucine
51 mg/kg/day of lysine
25 mg/kg/day of methionine + cysteine
44 mg/kg/day of phenylalanine + tyrosine
26 mg/kg/day of threonine
7 mg/kg/day of tryptophan
31 mg/kg/day of valine

Lactation

EAR FOR LACTATION
For all ages
15 mg/kg/day of histidine
24 mg/kg/day of isoleucine
50 mg/kg/day of leucine
42 mg/kg/day of lysine
21 mg/kg/day of methionine + cysteine
41 mg/kg/day of phenylalanine + tyrosine
24 mg/kg/day of threonine
7 mg/kg/day of tryptophan
28 mg/kg/day of valine

RDA FOR LACTATION
For all ages
19 mg/kg/day of histidine
30 mg/kg/day of isoleucine
62 mg/kg/day of leucine
52 mg/kg/day of lysine
26 mg/kg/day of methionine + cysteine
51 mg/kg/day of phenylalanine + tyrosine
30 mg/kg/day of threonine
9 mg/kg/day of tryptophan
35 mg/kg/day of valine

Source:
Dietary Reference Intakes For Energy, Carbohydrate, Fiber, Fat, Fatty Acids,Cholesterol, Protein,and Amino Acids, Institute of Medicine of the National Academies, 2002 and 2005, THE NATIONAL ACADEMIES PRESS 500 Fifth Street, N.W. Washington, DC 20001

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