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An article published in the Journal of Nutrition states,

"The amino acids regarded as essential for humans arephenylalanine, valine,threonine, tryptophan,isoleucine, methionine,leucine, lysine, andhistidine."

-Wikipedia- Essential Amino Acids

A: There are nine amino acids that are considered essential.

Additionally, cysteine (or sulphur-containing amino acids), tyrosine (or aromatic amino acids), and arginine are required by infants and growing children. (3 conditional)

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14y ago

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