serotonin, circadian rhythm, vitamin d, pineal gland, thyroid hormone, cortisol, hormone, estrogen, adenosine, nitric oxide, glutathione, prolactin, caffeine, dopamine, prostaglandin, tryptophan, beta endorphin, gamma aminobutyric acid, glucocorticoid, neurohormone, progesterone, antidiuretic hormone, glutamate, ghrelin, estradiol, histamine, salicylates, doxepin, anthocyanins, folate, nicotinamide, luteolin, citrulline, monoamines, vasopressin, wakefulness, thyroxine, curcumin, corticosterone, acetylcholine, carotenoid, antioxidants, aldosterone, scopolamine, oxytocin, noradrenaline, neurotransmitter, metabolism, vitamin e, oestrogen, androgen, adrenocorticotropic hormone, vitamin c, riboflavin, ergocalciferol, retinol, neurotransmission, ethosuximide, valproic acid, norepinephrine, luteinizing hormone, antidepressant, catecholamine, tyrosine, flecainide, insulin, flavonol, folic acid, ubiquinone, phenylethylamine, renin, enos, valerian, secretion, adrenal cortex, drowsiness, anthocyanin, catalase, quercetin, niacin, thiamine, reserpine, sleepiness, ovulation, indomethacin, glutamine, polyphenol, spironolactone, cytokines, glycyrrhizin, methylphenidate, melanin, zeaxanthin, thyrotropin, digoxin, ginkgo biloba, fructose, hesperidin, cannabinoid, levodopa, butterbur, calcium, testosterone, phenylalanine, choline, fsh, glucose, histidine, lysine, endorphin, striatal, 1a, aminobutyric, antigen, benzodiazepine, corticosteroid, cytokine, diazepam, enantioselective, extragonadal, fucose, globin, heme, hemoglobin

epiphysis, epiphysis cerebri, melanoderma, pineal body, pineal gland

internal secretion