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Melatonin secretion is linked to both sleep-wakefulness and light-dark cycles. Ocular perception that ambient light is dimming has been shown to promote increased secretion of melatonin by the pineal gland through neural pathways involving the hypothalamus. Serum levels increase tenfold just before sleep and peak around midnight. Twenty-four-hour secretion is higher in winter than in summer. The decline of melatonin secretion with age has been blamed for the tendency to insomnia in the elderly. Because melatonin acts as an antioxidant in counteracting free radicals, it has been promoted as a means of delaying aging and preventing cancer, heart disease, and Alzheimer dementia. It has also been proposed as an antidepressant because serotonin (5-hydroxytryptamine), the metabolism of which is known to be disordered in clinical depression, is a chemical precursor of melatonin. Adequately controlled, large-scale studies of the efficacy, safety, and optimal dosage of melatonin are lacking. There is experimental evidence that long-term administration can reset the circadian pacemaker. Several studies support the effectiveness of melatonin in preventing or reducing jet lag, particularly for travelers flying east across five or more time zones. The direct soporific effect of melatonin varies widely from person to person. Limited studies suggest that it may increase the duration of restful nighttime sleep in the elderly. High doses of melatonin result in prolonged elevation of serum melatonin level and increased production of prolactin by the pituitary gland. Unlike most hormones, melatonin is readily absorbed from the digestive tract and is a component of some foods. Hence therapeutic formulations are not subject to federal drug regulations or purity standards. Testing of commercially available preparations of melatonin has indicated both variation in potency and the presence of possibly harmful contaminants.
melatonin/mel·a·to·nin/ (mel″ah-to´nin) a catecholamine hormone synthesized and released by the pineal body; in mammals it influences hormone production and in many species regulates seasonal changes such as reproductive pattern and fur color. In humans it is implicated in the regulation of sleep, mood, puberty, and ovarian cycles and it has been tried therapeutically for insomnia, jet lag, and other conditions.
melatoninA hormone formed by methylation and acetylation of serotonin, which is produced in a diurnal cycle by the pineal gland in response to light. L-tryptophan is metabolised to 5-hydroxytryptophan which in turn is metabolised to serotonin and finally to N-acetyl-serotonin (melatonin). The pineal gland is similar to the photosensory organ of lower vertebrates; its binding sites are concentrated in the suprarhiasmatic nucleus of the hypothalamus (directly connected to the eyes) and possibly also to the biological clock. Melatonin secretion is intimately linked to the light-dark cycle, which peaks around midnight, and is highest in winter; it decreases with age. Production may be markedly increased in patients with hypothalamic or hypogonadotropic hypogonadism, or delayed puberty, and may be decreased in precocious puberty. It helps sleep, stimulates the immune system, may reverse ageing phenomena and may be of use in treating depression.
Melatonin should not be used in those with leukaemia, Hodgkin lymphoma or myeloma; it should not be used in pregnancy.
Melatonin has acquired currency in the alternative healthcare community as a self-administered tonic; some believe melatonin can be used to slow the ageing clock, extend a person’s lifespan, invigorate one’s sex life, slow the growth of cancer cells, treat insomnia, prevent heart disease and revive the immune system.
melatoninA hormone synthesized from serotonin in the pineal gland and elsewhere. Melatonin production has a strong circadian rhythm, being secreted mainly in the period between about 2100 hours and 0800 hours. Bright light suppresses melatonin secretion and exogenous melatonin can alter the timing of the body clock. For these reasons it has been proposed as a means of combatting jet lag. Other methods have been found more generally useful.
melatonina hormone of the pituitary gland thought to inhibit reproductive activities.
n the only hormone secreted into the bloodstream by the pineal gland. It appears to inhibit numerous endocrine functions, including the gonadotropic hormones, and to decrease the pigmentation of the skin.
Patient discussion about melatonin
Q. is there a blood test for melatonin
Q. Any other treatment for sleeplessness problem than Melatonin??? 33 years male having acute sleeping problem awake until 08:00-09:00am. Taking Melatonin failed.
The sleepless conditions calling for Belladonna are due to congestion; sleep is extremely restless, as a rule it is interrupted by talking, startings, muscular jerkings and spasmodic motions; frightful images appear on closing the eyes and the patient therefore dreads sleep. Children awake from sleep frightened. The dreams found under Belladonna are frightful ones, and they constantly awaken the patient. It is probably our best remedy for insomnia due to cerebral hyperaemia; that is, it will be most often indicated, also after morphine which produces cerebral hyperaemia of a passive variety. Aconite comes in here, too, but with Aconite there is intense anxiety and restlessness, fear of disaster or death. Cuprum, Stramonium and Zincum have the symptom that the patient is aroused from sleep frightened. For the complete list: http://www.hpathy.com/diseases/insomnia-sleeplessness-treatment-cure.asp Hope this helps.