Table 1.

Dietary requirements of essential amino acids and safe upper limit of consumption for adults.

Amino Acid	Requirement (mg.kg/day)1	Safe upper limit mg/kg/day2 (reference)
Histidine	18	64 [27]
Isoleucine	23	117 [28]
Leucine	49	657 [29]
Lysine	48	71 [30]
Methionine	23	71 [31]
Phenylalanine	48	143 [32]
Threonine	28	85 [33]
Tryptophan	8	64 [34]
Valine	32	97 [2]

¹Refs [2,4], based upon DRIs; ²Above habitual intake.