Conditionally Essential Amino Acid

An amino acid that is normally synthesised adequately by the body under standard physiological conditions, but whose endogenous production becomes insufficient during periods of illness, intensive physical stress, or accelerated growth. L-Glutamine, L-Arginine, L-Tyrosine, and Taurine are commonly classified as conditionally essential. Formulators should be precise about which population and condition makes an amino acid "conditionally essential" when making label claims.