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Mood disturbances, such as anxiety, depression, and irritability: These mental health symptoms can indicate a severe deficiency

Known FcRn expression sites include the bloodbrain barrier, the placenta, the liver, the genital tract, the skin, muscle tissue, the kidneys, the bladder, the intestines and stomach, the eyes, the lung and nasal epithelium, certain immune cells, and certain endocrine tissue

Glutathione reductase is another enzyme that helps maintain cellular redox homeostasis by maintaining the supply of reduced glutathione

Peptides are short chains of amino acids that act as signaling molecules in the body, as MedlinePlus describes in its overview of peptide hormones