A hormone secreted by the pineal gland. Chemically it is N-acety-5-methoxytryptamine. Research has indicated that there are daily rhythms in secretion of melatonin, in particular due to the depressing effect on melatonin production by light received by the retina. Conversely it appears that melatonin may influence the circadian rhythms of animals. There is some experimental evidence that administration of melatonin may increase the amount of sleep in people with sleep disorders. However, the evidence is not convincing and the effect is not profound. Nevertheless, the deregulation of melatonin and its availability over-the-counter has led to many people taking melatonin to help sleep, without consulting a physician.
As A Treatment"...Cautions, Contraindications and Side-Effects On the basis of theoretical ideas about how melatonin works, some authorities specifically recommend against using it for depression, schizophrenia, autoimmune diseases and other serious illnesses, or by pregnant or nursing women..."
a hormone secreted by the pineal gland; may inhibit reproductive activities
hormone secreted by the pineal gland; secretion stimulated by exposure to light.
As A Treatment"...John's Wort or tryptophan may help as well..."
A naturally occuring hormone secreted by the "pineal" gland. In humans, it likely plays a role in establishing 24-hour (circadian) sleep rhythms.
endocrine hormone secretd from the pineal gland involved with the diurnal cycle, melatoinin levels are high in dark, low in daylight. (More? Endocrine Notes | Pineal Gland)
A hormone, chemically related to both the pigment mela nin and the neurotransmitter sero tonin, it is produced primarily in the pineal gland (in the absence of light) from the neurotransmitter serotonin. It appears to be the chemical agent for several functions of the pineal gland having to do with timing and cycles. A powerful anti-oxidant, it enhances the immune system and is involved in the regulation of other hormonal levels. See text, Chapter 4. See also, "hormone," "neurohormone," "neurotransmitter, " "pineal gland" and "serotonin."
a human hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms.
a hormone produced rhythmically in vertebrates by the pineal gland, a pea sized organ at the center of the human brain. See also Melatonin.com
a natural hormone of the pineal gland. It is only released during the night.
Melatonin is a hormone produced by the pineal gland. It's main function is to signal the rest of your body as to when it is time to go to sleep.
(mehl'-aw-TO-nihn) A hormone secreted by the pineal gland that may play a role in circadian rhythms.
The hormone made in the pineal gland that controls circadian rhythms. It is also a powerful antioxidant for hydroxyl free radicals.
A neurohormone secreted by the pineal gland that is involved in regulating the sleep-waking cycle.
Hormone synthesised by the pineal gland. Secretion increases during exposure to light. In mammals, it influences hormone production and in many species regulates seasonal changes such as reproductive patterns. In humans, it is implicated in the regulation of sleep, mood, puberty and ovarian cycles.
Melatonin has been shown to strengthen immune systems, protect cells and reduce the effects of jet lag. Studies suggest this low-dose supplement can promote sleep without the hazards or side effects associated with prescription sleeping pills. Researchers also believe that melatonin can reduce the ravages of age. Although the body produces a lot of melatonin early in life, production begins to decline steadily as it ages. I use it every night. It helps me sleep very soundly.
a hormone that helps regulate the biological clock (sleep-wake cycles).
this hormone is a natural sleep and relaxation aid that may also have important anti-aging benefits; in addition, it may play a role in boosting immune responses and protecting cells from the damage caused by free radicals.
A hormone secreted by the pineal gland; inhibits secretion of MSH and GnRH.
hormone produced by the pineal gland in the brain and released mainly at night in the absence of light on the retina. Melatonin regulates the onset and timing of sleep and such seasonal changes in the body as winter weight gain. Levels of melatonin decline with age, which may explain why many elderly people suffer from insomnia. Melatonin is being investigated as a sleep promoter and to prevent or reduce jet lag. Melatonin is present in some foods but in fairly small amounts. Reported side effects include reduced fertility, inhibition of male sexual drive, hypothermia, and damage to retina.
Melatonin is a substance secreted by the pineal gland that passes by way of the blood or through the fluid of the third ventricle to the anterior pituitary gland to control gonadotropic hormone secretion; melatonin can be manufactured artificially and is showing several possible beneficial medical uses.
A naturally occurring hormone associated with sleep. Synthetic forms of melatonin are sold as sleep aids, although clinical data supporting melatonin use are insufficient.
A naturally occurring hormone, involved in the body's circadian rhythms and also in certain types of cancer, suggested by some studies to be affected by magnetic fields
A hormone that can influence the hypothalamus and pituitary gland and may affect appetite and sleep. It is derived from the amino acid, tryptophan.
a compound that regulates restorative restful sleep. When MSH is low, supplemental melatonin is usually ineffective in restoring normal sleep
A naturally occurring hormone in the body, which when supplemented provides dietary support for the maintenance of normal restful sleep.
in nature, a hormone that is secreted by the pineal gland in the brain in response to darkness, and has been linked to regulation of circadian rhythms; a derivative of melatonin marketed as a health food supplement is commercially available.
is made from serotonin when there is an absence of light. It is secreted by the pineal gland, a pea-size structure at the center of the brain, as our eyes register the fall of darkness. At night, melatonin is produced to help our bodies regulate our sleep-wake cycles. The amount of melatonin released at night varies among individuals, but can be related to age. Children, on average, secrete more melatonin than adults; melatonin levels may decrease with age. However, research has shown that older people with sleep problems do not always have lower melatonin levels than people who experience normal sleep.
Hormone produced by the pineal gland that regulates circadian rhythms; helps induce sleep and acts as an antioxidant.
a hormone manufactured in the centre of the brain which is sensitive to the light detected by the eyes. Its secretion begins in the evening, triggered by darkness, and peaks in the middle of the night. A powerful anti-oxidant.
Hormone secreted by the brain during sleep that appears to play a role in establishing normal body rhythms, etc. Melatonin seems sensitive to the amount and timing of the body's exposure to light, reflective of the time of day and seasonal changes. The decline of melatonin production with age may have a causal effect on the entire endocrine system. [See Pineal Gland
A hormone produced by the pineal gland in the brain and released mainly at night in the absence of light on the retina. Regulates the onset and timing of sleep and seasonal changes in the body such as winter weight gain. Levels of melatonin decline with age. Melatonin is being investigated as a sleep promoter and to prevent or reduce jet lag. Synthetic melatonin and melatonin derived from bovine pineal glands are available as over-the-counter dietary supplements. Melatonin occurs naturally in some foods but in fairly small amounts. Reported side effects include reduced fertility, inhibition of male sexual drive, hypothermia, damage to the retina. Some physicians and scientists advise against taking melatonin as a long-term supplement.
a hormone secreted by the pineal gland used as a marker of circadian rhythmicity in humans
naturally occurring hormone produced by the pineal gland, manufactured in the body from the amino acid Tryptophan, which is then converted to serotonin. Very useful for travelers in dealing with jet lag. Aids in sleep for most people. Typical dose: 3mg. Those who do not get good results with melatonin might try 5-HTP.
Produced from serotonin, melatonin is released by the pineal gland into the bloodstream. It affects physiological changes related to time and lighting cycles.
A hormone produced by the pineal gland, melatonin is intimately involved in regulating the sleeping and waking cycles, among other processes. Melatonin supplements are sometimes used by people who have chronic insomnia. Always see your doctor before taking melatonin, as it is not recommended for all patients with sleep problems.
a hormone secreted from the pineal gland. Its concentration in the blood varies following a daily cycle. The maximum concentration occurs in the night, triggering sleepiness, with the minimal concentration around noon.
A natural hormone available in synthetic form for supplementation. Used extensively as a sleep aid.
A hormone (a chemical produced by the body and carried by the bloodstream to another part of the body to stimulate or retard its function) produced in the hypothalamus of the brain that causes a drop in body temperature and sleepiness.
A peptide hormone synthesized from serotonin in the pineal gland. Primarily involved in proper sleep cycle function, it also serves as a potent antioxidant for the brain, heart and other tissues.
A hormone secreted by the pineal gland in the brain. Melatonin has been reported to have hypnotic properties, leading some to suggest that melatonin, which is released at night, may be an endogenous sleep inducer.
A hormone made by the pineal gland (tiny organ near the center of the brain). Melatonin helps control the body's sleep cycle, and is an antioxidant. It is also made in the laboratory and sold as a supplement.
A hormone produced by the pineal gland in the brain; sold as a sleep aid in many pharmacies and healthfood stores.
The only hormone secreted into the bloodstream by the pineal gland. The hormone appears to inhibit numerous endocrine functions, including the gonadotropic hormones. Research exists on the efficacy of melatonin in treating jet lag and certain sleep disorders. Dosages greater than l milligram have been associated with drowsiness, headaches, disturbances in sleep/wake cycles and is contraindicated in those who are on antidepressive medication. It also negatively influences insulin utilization.
hormone secreted by the pineal gland that is involved in the sleep/wakefulness cycle
a hormone secreted by the pineal gland in the brain, produced at night, in darkness, and brings on the urge to sleep.
A hormone produced by the pineal gland responsible for regulating biological rhythms.
a hormone secreted by the pineal gland that is derived from the amino acid tryptophan, which helps synchronize biological clock neurons in the suprachiasmatic nucleus.
Melatonin A hormone derived from serotonin and produced by the pineal gland that stimulates color change in the epidermis of amphibians and reptiles and plays a role in sleep, aging, and reproduction in mammals .
This hormone is mainly known for its ability to regulate the body's sleeping/waking cycle, but it is also a powerful antioxidant and immune stimulant.
As A Treatment"...It is not a part of your daily diet, unless you are in the habit of eating pineal glands! Because the body's own production of melatonin is probably the equivalent of only 0..." Related Topic"The only hormone secreted into the bloodstream by the pineal gland..."
A hormone produced by the pineal gland. The level of melatonin increases at night, but like other hormones, production of melatonin diminishes with age.
Melatonin, 5-methoxy-N-acetyltryptamine, is a hormone found in all living creatures from algae to humans, at levels that vary in a diurnal cycle. In higher animals melatonin is produced by pinealocytes in the pineal gland (located in the brain) and also by the retina and GI tract. It is naturally synthesized from the amino acid tryptophan (via synthesis of serotonin) by the enzyme 5-hydroxyindole-O-methyltransferase.