Fri November 16, 2012 By: Sm

In one of the questions of online test on this website, argenine has been given as correct answer as an essential amino acid. Most of the references do not recognize argenine as essential amino acid. Please clarify.

Expert Reply
Mon November 19, 2012
The amino acids arginine, cysteine, glycine, glutamine, histidine, proline, serine and tyrosine are considered conditionally essential, meaning they are not normally required in the diet, but must be supplied exogenously to specific populations that do not synthesize them in adequate amounts.
Arginine is required for the young, but not for adults so it is conditionally essential for some ages or medical conditions.
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