“It was found that L-aspartate inhibits norepinephrine-stimulated melatonin production as well as serotonin N-acetyltransferase activity reversibly and dose-dependently, the concentrations required for 50% inhibition being 150 and 175 microM, respectively.”
“These results suggest that pinealocytes use L-aspartate , as well as L-glutamate, as a negative regulator for melatonin production.”