Which of the following amino acids is conditionally essential in humans?

A Arginine
B Glutamine ✓
C Cysteine
D Tyrosine

Explanation

Glutamine is considered conditionally essential because it can be synthesized by the body under normal conditions, but its synthesis may be impaired during times of stress or illness, making dietary supplementation necessary.

Source

Journal of Nutrition
Protein Metabolism Nutrition Amino Acid Metabolism Hard MEDICAL Confidence: medium