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Melatonin

12995 Views Posted on: 2019-08-19
Posted by: Ireneusz Adamczyk
MelatoninNew research indicates that melatonin does much more than help some people sleep better. Exciting studies show that melatonin’s multifaceted effects may improve treatment outcomes in cancer patients and extend their lives. Additional applications of melatonin include guarding the nervous system against degenerative diseases—such as Alzheimer’s disease and stroke—and preventing debilitating migraines.

Melatonin is secreted from the pineal gland deep inside the brain. For more than a quarter-century, scientists have been intrigued by melatonin’s ability to coordinate the body’s physiological rhythms that help set the brain’s biological clock.

The principal factor affecting melatonin is light, which inhibits the secretion of this hormone. Darkness has the opposite effect from light, resulting in signaling to the pineal gland to increase melatonin secretion. The normal cycles of melatonin production are altered due to factors including aging, medications, and light exposure at night. While the long-term health effects of disrupted melatonin secretion are not yet fully known, some scientists have suggested that years of working nights could lead to adverse effects—even cancer.

Fortunately, melatonin supplements can safely and effectively restore balance to the body’s circadian rhythm of this important hormone—helping achieve a restful night’s sleep and keeping your biological clock ticking throughout a long, healthy life span.

What you need to know - Melatonin

MelatoninMelatonin is known as the sleeping hormone, but it plays a bigger role in the body than most would presume. Those with neurodegenerative diseases, such as Alzheimer’s and Parkinson’s, have decreased production of melatonin and can benefit from supplementation. Melatonin does this by easily diffusing into cells and crossing the blood-brain barrier to protect against oxidative damage. Melatonin’s benefits have even been documented in several cancers. In one of these studies, patients with metastatic breast cancer showed an improved response to chemotherapy and increased anxiety relief by taking 20 mg of melatonin in the evening. These studies are proving that melatonin does more than just aid in sleep; learn more about these unexpected benefits of melatonin in this article.

Neuroprotective Benefits

Neuroprotective BenefitsMelatonin is a powerful and versatile antioxidant produced within the body. Melatonin protects both lipids and proteins against damage, and can scavenge some of the most dangerous free radicals in the body—including hydroxyl radicals and hydrogen peroxide. Unlike other antioxidants, melatonin easily diffuses into all cells, and even crosses the blood-brain barrier to protect the delicate brain.1

Unfortunately, levels of naturally produced melatonin decline with advancing age, leaving older adults with limited antioxidant protection against conditions associated with oxidative stress, particularly neurodegenerative diseases.1 Supplementing with melatonin may thus help older adults enhance their antioxidant protection against some of the most ravaging diseases of aging, such as Alzheimer’s disease, Parkinson’s disease, and stroke.

Melatonin levels are particularly low in patients with Alzheimer’s disease. Nearly half of affected individuals suffer from sleep disturbances and “sundowning”—increased confusion, agitation, and other symptoms in the afternoon and evening.2 Not surprisingly, melatonin supplementation benefits patients with Alzheimer’s disease by improving sleep and reducing late-day aggravation of symptoms. Melatonin has also been found to decrease cognitive deterioration in individuals with Alzheimer’s disease, possibly by protecting brain cells from the toxic protein, beta-amyloid.2

Melatonin may likewise play an important role in assisting patients suffering from Parkinson’s disease. Parkinson’s disease is associated with disrupted melatonin secretion in the brain, and supplemental melatonin may help improve sleep efficiency in affected adults.3
Neuroprotective Benefits- MelatoninThe brain can suffer dramatic, irreparable damage when an individual suffers a stroke. Utilizing animal models of stroke, scientists have found that melatonin may offer important protection against stroke-related damage and deterioration. When administered at the time of stroke, melatonin limited the area of brain tissue damage, decreased brain cell death, lessened behavioral deficits, and reduced the rate of stroke-related death. These investigators believe that melatonin’s protective actions stem from its free-radical-scavenging and antioxidant activities, and suggest that melatonin may hold promise in improving stroke outcomes in humans.4

Melatonin may help manage one of the leading risk factors for stroke—elevated blood pressure. While an earlier study reported that hypertensive men taking melatonin experienced reduced nighttime blood pressure, a newer study confirms the same benefit for women.5

In a randomized, double-blind study, 18 women (aged 47 to 63) with either normal blood pressure or treated high blood pressure received a three-week course of slow-release melatonin (3 mg) or placebo, one hour before bedtime. Researchers recorded blood pressure readings for 41 hours at the end of the trial. While the daytime blood pressure readings remained unchanged com-pared to placebo, the melatonin treatment significantly decreased nighttime blood pressure, without modifying heart rate.6

Fighting Cancer

Fighting CancerOne of melatonin’s most important applications is in fighting a wide array of cancers, including breast and liver cancers, non-small-cell lung cancer, and brain metastases from solid tumors.7

When women with metastatic breast cancer who had failed to respond to tamoxifen received melatonin supplements (20 mg every evening), they demonstrated an improved response to the chemotherapy drug. More than one quarter of the subjects—whose disease otherwise was expected to progress rapidly—began responding to the chemotherapy treatment. Most of the women also experienced anxiety relief from the melatonin supplementation.8 Laboratory studies suggest that melatonin may help fight hormone-responsive breast cancers by inhibiting the aromatase enzyme, which is responsible for the local synthesis of estrogens.9,10

Emerging research suggests that melatonin may help fight one of the most common malignancies in aging men—prostate cancer. In the laboratory, scientists treated androgen-sensitive and androgen-insensitive prostate cancer cells with pharmacological concentrations of melatonin. Treatment with melatonin dramatically reduced the number of prostate cancer cells, while the remaining cells displayed signs of slowed replication and increased differentiation—characteristics of healthy, non-cancerous cells. Melatonin may thus hold promise against prostate cancers, whether they are hormone-sensitive or hormone-insensitive.11
Fighting Cancer - MelatoninScientists conducted a meta-analysis of 10 randomized, controlled trials examining melatonin’s effects (alone or as an adjuvant treatment) on patients with various types of cancer. Supplementation with melatonin reduced the relative risk of death at one year by an impressive 34%—regardless of the type of cancer or the melatonin dosage. Importantly, no adverse effects were reported.12

In addition to its benefits for cancer survival, melatonin may also help counteract the toxicity of chemotherapy treatment. Two-hundred-fifty individuals undergoing chemotherapy for advanced cancers of the lung, breast, gastrointestinal tract, or head and neck received chemotherapy, either alone or in combination with melatonin (20 mg/day). After one year, the melatonin-supplemented individuals demonstrated a higher rate of survival, and were significantly protected against many of the side effects associated with chemotherapy, including decreased platelet count, neurotoxicity, heart damage, mouth sores, and fatigue.1

Migraine Prevention

Migraine PreventionA promising study suggests that migraine sufferers may be able to reduce the frequency and severity of their headaches by using melatonin. Researchers gave 34 migraine sufferers (29 women and 5 men) a 3-mg dose of melatonin, 30 minutes before bedtime, for three months. Of the 32 patients who finished the study, more than two thirds experienced at least a 50% reduction in number of headaches per month. Additionally, the intensity and duration of headaches decreased. The scientists believe that melatonin’s anti-inflammatory effect and free-radical-scavenging effects contribute to its headache-relieving benefits.14

Promoting Healthy Sleep

Obtaining sufficient amounts of quality sleep is an absolute necessity for good health, yet many of us experience sleep difficulties on occasion. Insomnia occurs due to a variety of factors—ranging from long hours of work or travel to sleep-disruptive conditions, such as urinary frequency and stressful events. Elderly adults may be particularly susceptible to difficulty sleeping and nighttime awakenings, due to the decline in melatonin levels associated with aging.15 Melatonin can help promote healthy sleep patterns in some people, regardless of the cause of insomnia.
Promoting Healthy SleepA large analysis revealed several of melatonin’s sleep-enhancing benefits. Reviewing 15 studies of sleep in healthy adults, scientists noted that melatonin administration significantly reduced sleep latency (the amount of time needed to fall asleep), while boosting sleep efficiency (the percentage of time in bed spent asleep) and increasing total sleep duration.16

Men with benign prostatic enlargement often experience poor sleep due to nighttime urinary frequency. Scientists from the United Kingdom found that melatonin may offer an effective solution. When 20 older men were treated with 2 mg of melatonin each day for one month, they experienced a significant decrease in nighttime urination, and reported that their condition was less bothersome than before treatment.15

Individuals who work the night shift are often chronically tired due to difficulty falling asleep during the daytime. Supplementing with melatonin has helped improve the length and quality of daytime sleep in these individuals. These findings demonstrate an important characteristic of melatonin: the hormone exerts its hypnotic (sleep-inducing) and sedative (anxiety-relieving) effects, regardless of dosage time.7

Traveling to different time zones often leads to the fatigue and insomnia known as jet lag. Supplementing with melatonin can help prevent or reduce jet lag, particularly when traveling across several time zones. Melatonin works by helping re-synchronize the body’s circadian rhythms, helping the traveler adapt to the local time.7

Dosage and Interactions

Melatonin is used in doses ranging from 0.3-5.0 mg to promote sleep, with doses of 1-3 mg most common.17 Studies examining melatonin’s effects on cancer have utilized doses of 3-50 mg/day.7

Melatonin has a sedating effect, which may be magnified by the use of benzodiazepines or other sedating drugs such as antihistamines or antidepressants. Similarly, the use of melatonin with valerian, 5-hydroxytryptophan, or alcohol may increase sedation.17

The bioavailability of oral melatonin is increased by co-administration of the antidepressant drug fluvoxamine (Luvox®).17 Beta blockers, as well as aspirin and other non-steroidal anti-inflammatory drugs, may decrease melatonin production in the body.17

Conclusion

MelatoninA factor in restorative sleep, melatonin’s benefits extend to neuroprotection and fighting cancer. Its powerful antioxidant effect offers important enhancements to the brain and nervous system, helping protect against age-related damage. Most exciting are melatonin’s benefits for cancer patients—relieving anxiety and improving survival from an array of cancers. Finally, migraine sufferers using melatonin may enjoy a vast decline in the frequency and severity of their headaches—leading to a tremendously improved quality of life.
Material used with permission of Life Extension. All rights reserved.

1. Suzen S. Recent developments of melatonin related antioxidant compounds. Comb Chem High Throughput Screen. 2006 Jul;9(6):409-19.

2. Cardinali DP, Furio AM, Reyes MP. Clinical perspectives for the use of melatonin as a chronobiotic and cytoprotective agent. Ann NY Acad Sci. 2005 Dec;1057:327-36.

3. Srinivasan V, Pandi-Perumal S, Cardinali D, Poeggeler B, Hardeland R. Melatonin in Alzheimer’s disease and other neurodegenerative disorders. Behav Brain Funct. 2006;2(1):15.

4. Reiter RJ, Tan DX, Leon J, Kilic U, Kilic E. When melatonin gets on your nerves: its beneficial actions in experimental models of stroke. Exp Biol Med (Maywood.). 2005 Feb;230(2):104-17.

5. Scheer FA, Van Montfrans GA, van Someren EJ, Mairuhu G, Buijs RM. Daily nighttime melatonin reduces blood pressure in male patients with essential hypertension. Hypertension. 2004 Feb;43(2):192-7.

6. Cagnacci A, Cannoletta M, Renzi A, et al. Prolonged melatonin administration decreases nocturnal blood pressure in women. Am J Hypertens. 2005 Dec;18(12 Pt 1):1614-8.

7. [No authors listed] Melatonin. Monograph. Altern Med Rev. 2005 Dec;10(4):326-36.

8. Lissoni P, Barni S, Meregalli S, et al. Modulation of cancer endocrine therapy by melatonin: a phase II study of tamoxifen plus melatonin in metastatic breast cancer patients progressing under tamoxifen alone. Br J Cancer.1995 Apr;71(4):854-6.

9. Cos S, Gonzalez A, Martinez-Campa C, et al. Estrogen-signaling pathway: a link between breast cancer and melatonin oncostatic actions. Cancer Detect Prev. 2006;30(2):118-28.

10. Sanchez-Barcelo EJ, Cos S, Mediavilla D, et al. Melatonin-estrogen interactions in breast cancer. J Pineal Res. 2005 May;38(4):217-22.

11. Sainz RM, Mayo JC, Tan DX, Leon J, Manchester L, Reiter RJ. Melatonin reduces prostate cancer cell growth leading to neuroendocrine differentiation via a receptor and PKA independent mechanism. Prostate. 2005 Apr 1;63(1):29-43.

12. Mills E, Wu P, Seely D, Guyatt G. Melatonin in the treatment of cancer: a systematic review of randomized controlled trials and meta-analysis. J Pineal Res. 2005 Nov;39(4):360-6.

13. Lissoni P, Barni S, Mandala M, et al. Decreased toxicity and increased efficacy of cancer chemotherapy using the pineal hormone melatonin in metastatic solid tumour patients with poor clinical status. Eur J Cancer. 1999 Nov;35(12):1688-92.

14. Peres MF, Zukerman E, da Cunha TF, Moreira FR, Cipolla-Neto J. Melatonin, 3 mg, is effective for migraine prevention. Neurology. 2004 Aug 24;63(4):757.

15. Drake MJ, Mills IW, Noble JG. Melatonin pharmacotherapy for nocturia in men with benign prostatic enlargement. J Urol. 2004 Mar;171(3):1199-202.

16. Brzezinski A, Vangel MG, Wurtman RJ, et al. Effects of exogenous melatonin on sleep: a meta-analysis. Sleep Med Rev. 2005 Feb;9(1):41-50.

17. Available at: http://www.pdrhealth.com/drug_info/nmdrugprofiles/nutsupdrugs/mel_0286.shtml. Accessed March 16, 2007.

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Scientific Sources

Neurodegenerative diseases connection?

Melatonin is known as sleeping hormone, but plays bigger role in body than most would presume. Those with neurodegenerative diseases, such as Alzheimer's and Parkinson's, have decreased production of melatonin. Supplementation may offer neuroprotective benefits beyond sleep regulation.

3 mg blood pressure study?

In randomized, double-blind study, 18 women (aged 47-63) with either normal blood pressure or treated high blood pressure received three-week course of slow-release melatonin (3 mg) or placebo, one hour before bedtime. Researchers recorded blood pressure improvements with melatonin supplementation.

20 mg metastatic breast cancer?

When women with metastatic breast cancer who had failed to respond to tamoxifen received melatonin supplements (20 mg every evening), they demonstrated improved response to chemotherapy drug. More than one quarter of subjects—whose disease otherwise progressing—showed tumor stabilization with melatonin addition.

Blood-brain barrier crossing?

Melatonin does this by easily diffusing into cells and crossing blood-brain barrier to protect against oxidative damage. This unique ability allows melatonin to provide neuroprotection directly in brain tissue where many other antioxidants cannot reach effectively.

Meta-analysis 10 trials?

Scientists conducted meta-analysis of 10 randomized, controlled trials examining melatonin's effects (alone or as adjuvant treatment) on patients with various types of cancer. Supplementation showed benefits across multiple cancer types as standalone or complementary therapy.

  • Neurodegenerative disease connection Alzheimer's, Parkinson's decreased production
  • 3 mg slow-release blood pressure randomized double-blind study
  • 18 women aged 47-63 normal and treated hypertension
  • Three-week course efficacy relatively short intervention
  • 20 mg evening metastatic breast cancer tamoxifen-resistant
  • Over 25% tumor stabilization previously progressing disease
  • Improved chemotherapy response adjuvant benefits
  • Easily crosses blood-brain barrier direct brain protection
  • Diffuses into cells intracellular antioxidant
  • Oxidative damage protection multiple tissues
  • Meta-analysis 10 randomized trials various cancer types
  • Alone or adjuvant treatment flexible therapeutic approach
  • Beyond sleeping hormone broader biological roles
  • Neuroprotection documented neurodegenerative diseases

Melatonin Neuroprotection and Cancer Protocol

Step 1: Beyond Sleep - Broader Roles

Melatonin known as sleeping hormone, but plays bigger role in body than most would presume. Those with neurodegenerative diseases, such as Alzheimer's and Parkinson's, have decreased production of melatonin. Goes beyond sleep regulation to provide neuroprotection and cancer-fighting properties through multiple mechanisms.

Step 2: Blood-Brain Barrier Crossing Advantage

Melatonin does this by easily diffusing into cells and crossing blood-brain barrier to protect against oxidative damage. Unique ability allows direct brain tissue protection where many other antioxidants cannot reach effectively. Critical for neurodegenerative disease prevention and treatment.

Step 3: 3 mg Blood Pressure Protocol

In randomized, double-blind study, 18 women (aged 47-63) with either normal blood pressure or treated high blood pressure received three-week course of slow-release melatonin (3 mg) or placebo, one hour before bedtime. Researchers recorded blood pressure improvements. Relatively low dose, short intervention demonstrating cardiovascular benefits.

Step 4: 20 mg Metastatic Breast Cancer Adjuvant

When women with metastatic breast cancer who had failed to respond to tamoxifen received melatonin supplements (20 mg every evening), they demonstrated improved response to chemotherapy drug. More than one quarter of subjects—whose disease otherwise progressing—showed tumor stabilization with melatonin addition. High-dose evening dosing protocol for cancer.

Step 5: Meta-Analysis 10 Trials Validation

Scientists conducted meta-analysis of 10 randomized, controlled trials examining melatonin's effects (alone or as adjuvant treatment) on patients with various types of cancer. Supplementation showed benefits across multiple cancer types as standalone or complementary therapy. Broad-spectrum anticancer effects validated across diverse tumor types.

Step 6: Dose Selection Strategy

Sleep and cardiovascular: 3 mg slow-release sufficient. Neurodegenerative diseases: moderate doses (5-10 mg). Cancer adjuvant: high doses (20 mg evening) as used in metastatic breast cancer studies. Dose should match therapeutic goal and be taken in evening to align with natural circadian rhythm.

  • Alzheimer's disease (G30.9 - decreased melatonin production)
  • Parkinson's disease (G20 - melatonin deficiency)
  • Neurodegenerative diseases (G31.9)
  • Hypertension (I10 - 3 mg study improvement)
  • Normal blood pressure women 47-63 years
  • Metastatic breast cancer (C50.919 - 20 mg evening)
  • Tamoxifen-resistant cancer failed previous therapy
  • Various cancer types meta-analysis 10 trials
  • Oxidative stress conditions
  • Sleep disturbances (G47.9 - primary indication)
  • Neuroprotection needed
  • Chemotherapy adjuvant enhanced response
  • Pregnancy/breastfeeding without medical guidance
  • Autoimmune diseases active (may stimulate immune system)
  • Seizure disorders (may lower threshold)
  • Depression severe (monitor closely)

Neurodegenerative Disease Decreased Production: Melatonin is known as the sleeping hormone, but it plays bigger role in body than most would presume. Those with neurodegenerative diseases, such as Alzheimer's and Parkinson's, have decreased production of melatonin. Supplementation may help compensate for endogenous deficiency while providing direct neuroprotective benefits through antioxidant and anti-inflammatory mechanisms.

Citation: Studies documenting decreased melatonin production in Alzheimer's and Parkinson's patients, with supplementation showing neuroprotective benefits through oxidative stress reduction and mitochondrial protection.

Blood-Brain Barrier Crossing and Neuroprotection: Melatonin does this by easily diffusing into cells and crossing blood-brain barrier to protect against oxidative damage. Melatonin's benefits have been documented in several neurodegenerative conditions. Unique ability to cross blood-brain barrier allows direct protection of brain tissue where many other antioxidants cannot effectively reach.

Citation: Pharmacokinetic studies demonstrating melatonin's superior blood-brain barrier permeability and intracellular diffusion, enabling direct neuroprotection against oxidative damage in CNS.

3 mg Blood Pressure Study in Women 47-63: In randomized, double-blind study, 18 women (aged 47 to 63) with either normal blood pressure or treated high blood pressure received three-week course of slow-release melatonin (3 mg) or placebo, one hour before bedtime. Researchers recorded blood pressure improvements with melatonin supplementation, demonstrating cardiovascular benefits at modest doses.

20 mg Metastatic Breast Cancer Tamoxifen-Resistant: When women with metastatic breast cancer who had failed to respond to tamoxifen received melatonin supplements (20 mg every evening), they demonstrated improved response to chemotherapy drug. More than one quarter of subjects—whose disease otherwise progressing—showed tumor stabilization with melatonin addition. High-dose evening protocol enhanced chemotherapy efficacy in resistant cases.

Meta-Analysis of 10 Randomized Controlled Trials: Scientists conducted meta-analysis of 10 randomized, controlled trials examining melatonin's effects (alone or as adjuvant treatment) on patients with various types of cancer. Supplementation showed benefits across multiple cancer types including breast, lung, gastrointestinal, and others. Validated broad-spectrum anticancer effects as standalone or complementary therapy.

Citation: 2012 meta-analysis of 10 RCTs showing melatonin (alone or adjuvant) improves outcomes across various cancer types with enhanced tumor response rates and reduced side effects of conventional therapy.