Could depression be caused by an amino acid deficiency?

Could depression be caused by an amino acid deficiency?
(Natural News) According to a study by researchers from the University of Eastern Finland (UEF), individuals with major depressive disorder (MDD) have reduced arginine levels. Arginine is an amino acid that the body needs to produce nitric oxide. Nitric oxide is an immune defense and nervous system mediator. Additionally, nitric oxide is necessary for vascular regulation. The global arginine bioavailability ratio (GABR) is…
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