Nutrients that facilitate a reduction of raised cortisol and adrenaline in stress are vitamin C, vitamin B-complex, selenium, magnesium, complex carbohydrates, amino acids tyrosine, tryptophan, theanine, and phenylalanine. Tyrosine is the precursor of noradrenaline while tryptophan is required for secretion of serotonin which is 5-hydroxytryptamine (5-HT). Serotonin or 5HT receptors in the blood vessels help regulate blood pressure to reduce stress. Tryptophan in the diet or high carbohydrate low protein (CR PP) diet raises serotonin. Low levels of serotonin or tryptophan cause depression. The secretion of antidepressants dopamine and norepinephrine requires phenylalanine and tyrosine which can be metabolized only by vitamin C. Vitamin C also helps in faster recovery from emotional and physical stress.