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  1. #1
    Registered User johnnyfry's Avatar
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    Melatonin and testosterone?

    Hello,

    I have been taking Melatonin at night to help me sleep (I have been trying to sleep more on my back and I never find it comfortable) and I have been searching information about it's effect on testosterone.

    I have read that Melatonin inhibits the secretion of testosterone and I am trying to find out how much truth there is to this. Can anyone here either verify if this is true or not. The article I read was a paper written quite a few years back.

    Thanks.
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    Registered User pecan's Avatar
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    news to me. the only connection with testosterone that i am aware of is that melatonin is, in fact, a hormone..generally highest within one's childhood years.

    possibly, you might consider valerian? i use it to sleep. the trick is, take it about an hour before bed and then lay down.
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  3. #3
    Registered User johnnyfry's Avatar
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    I hope you are right, I will investigate some more. Thanks for your response.
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  4. #4
    nevigsawkufelgnisaton in10city's Avatar
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    The one that I am aware of that draws this conclusion is a rat study -> Melatonin inhibits testosterone secretion by acting at hypothalamo-pituitary-gonadal axis in the rat.


    HOWEVER, this one shows "that long-term melatonin administration does not alter the secretory patterns of reproductive hormones in normal men." -> Long-term melatonin administration does not alter pituitary-gonadal hormone secretion in normal men


    This one shows "decreased semen quality " and at the same time supports that the "effect of exogenous melatonin on pituitarygonadal hormones in men has been studied during the last 25 years and has revealed no effect on basal morning hormone levels (Nordlund and Lerner, 1977; Wright et al, 1986; Seabra et al, 2000; Siegrist et al, 2001) or on the nocturnal pulsatile secretion of hormones (Lubo****zky et al, 2000)." -> Melatonin administration alters semen quality in healthy men.
    Last edited by in10city; 09-19-2007 at 08:35 AM.
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  5. #5
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    As far as I know melatonin boosts GH secretion at night.
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  6. #6
    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by Fidelitas626 View Post
    As far as I know melatonin boosts GH secretion at night.
    References?
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  7. #7
    Inquire about Zapnin SolidSteel86's Avatar
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    Melatonin is a naturally occuring hormone, it signals sleep time. Usually influenced by how light or dark it is (artificial lights can affect this too).

    I highly doubt it will affect your T levels to any real degree.
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  8. #8
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    Originally Posted by in10city View Post
    References?

    LOOOOONG post lol


    Growth Dev Aging. 1990 Winter;54(4):165-71. Related Articles, Links


    Melatonin increases serum growth hormone and insulin-like growth factor I (IGF-I) levels in male Syrian hamsters via hypothalamic neurotransmitters.

    Vriend J, Sheppard MS, Borer KT.

    Department of Anatomy, University of Manitoba, Winnipeg, Canada.

    In male Syrian hamsters daily evening melatonin injections resulted in increased circulating levels of growth hormone (GH), as well as a modest increase in body weight. A substantial increase in serum levels of insulin-like growth factor I (IGF-I) was observed in all hamsters receiving evening injections of melatonin for 10 weeks. The melatonin-induced increase in serum IGF-I levels was interpreted as a result of increased release of GH during the 10 week period of melatonin administration. The increase in serum GH and IGF-I was associated with significantly decreased hypothalamic turnover of norepinephrine (NE). Since blocking NE synthesis with alpha methyl-p-tyrosine reduced serum GH, the melatonin-induced increase in GH could not readily be attributed to decreased NE turnover. Highly significant increases in 5-hydroxyindole acetic acid (5HIAA) concentrations and in ratios of 5HIAA to serotonin (5HT) were noted in extracts of hypothalamus and in extracts of brain stem, suggesting a serotonergic component to melatonin-induced increase in GH-induced IGF secretion and subsequent growth

    Clin Endocrinol (Oxf). 1987 Apr;26(4):453-8. Related Articles, Links


    Effect of oral administration of melatonin on GH responses to GRF 1-44 in normal subjects.

    Valcavi R, Dieguez C, Azzarito C, Edwards CA, Dotti C, Page MD, Portioli I, Scanlon MF.

    Sezione Endocrino Metabolica, Unita Sanitaria Locale, Reggio Emilia, Italy.

    In order to investigate the role of melatonin on the neuroregulation of GH secretion, eight healthy male volunteers each underwent four separate tests in random order separated by at least 1 week. Following oral administration of melatonin (500 mg at -60 min and at -30 min) plasma GH levels were higher than after placebo at 45 min (mean +/- SEM 2.9 +/- 0.8 vs 0.9 +/- 0.4 ng/ml, P less than 0.01) and 60 min (mean +/- SEM 2.9 +/- 0.4 vs 0.8 +/- 0.1 ng/ml, P less than 0.05). Likewise, after prior administration of melatonin, GH responses to GRF 1-44 (1 micrograms/kg i.v. at 0 min) were greater than placebo plus GRF at 15 min (mean +/- SEM 22.4 +/- 6.1 ng/ml vs 11.3 +/- 2.3 ng/ml, P less than 0.05), 45 min (mean +/- SEM 26.2 +/- 5.3 ng/ml vs 13.3 +/- 2.5 ng/ml, P less than 0.01) and 60 min (mean +/- SEM, 24.7 +/- 7.4 ng/ml vs 11.1 +/- 2.5 ng/ml, P less than 0.05). In contrast we did not observe any effect of either 10(-9)M, 10(-7)M melatonin on in-vitro basal GH release and GH responses to 10(-8)M GRF by rat anterior pituitary cells in monolayer culture. These data suggest that melatonin plays a facilitatory role in the neuroregulation of GH secretion, probably by acting at the hypothalamic level.


    Clin Endocrinol (Oxf). 1993 Aug;39(2):193-9. Related Articles, Links


    Melatonin stimulates growth hormone secretion through pathways other than the growth hormone-releasing hormone.

    Valcavi R, Zini M, Maestroni GJ, Conti A, Portioli I.

    2a Divisione di Medicina Interna, Arcispedale S. Maria Nuova, Reggio Emilia, Italy.

    OBJECTIVE: There is evidence that melatonin plays a role in the regulation of GH secretion. The aim of this study was to investigate the neuroendocrine mechanisms by which melatonin modulates GH secretion. Thus we assessed the effect of oral melatonin on the GH responses to GHRH administration and compared the effects of melatonin with those of pyridostigmine, a cholinergic agonist drug which is likely to suppress hypothalamic somatostatin release. DESIGN: The study consisted of four protocols carried out during the afternoon hours. Study 1: oral melatonin (10 mg) or placebo were administered 60 minutes prior to GHRH (100 micrograms i.v. bolus). Study 2: GHRH (100 micrograms i.v. bolus) or placebo were administered at 0 minutes; oral melatonin or placebo were given at 60 minutes and were followed by a second GHRH stimulus (100 micrograms i.v. bolus) at 120 minutes. Study 3: placebo; oral melatonin (10 mg); oral pyridostigmine (120 mg); melatonin (10 mg) plus pyridostigmine (120 mg) were administered on separate occasions. Study 4: placebo; oral melatonin (10 mg); oral pyridostigmine (120 mg); melatonin (10 mg) plus pyridostigmine (120 mg) were administered on separate occasions 60 minutes prior to a submaximal dose (3 micrograms i.v. bolus) of GHRH. SUBJECTS: Four groups of eight normal male subjects, ages 22-35 years, were randomly assigned to each protocol. MEASUREMENTS: Growth hormone was measured by RIA at 15-minute intervals. RESULTS: Oral melatonin administration had a weak stimulatory effect on GH basal levels. Prior melatonin administration approximately doubled the GH release induced by supramaximal (100 micrograms) or submaximal (3 micrograms) doses of GHRH. Melatonin administration restored the GH response to a second GHRH challenge, given 120 minutes after a first GHRH i.v. bolus. The GH releasing effects of pyridostigmine, either alone or followed by GHRH, were greater than those of melatonin. However, the simultaneous administration of melatonin and pyridostigmine was not followed by any further enhancement of GH release, either in the absence or in the presence of exogenous GHRH. CONCLUSIONS: Our data indicate that oral administration of melatonin to normal human males increases basal GH release and GH responsiveness to GHRH through the same pathways as pyridostigmine. Therefore it is likely that melatonin plays this facilitatory role at the hypothalamic level by inhibiting endogenous somatostatin release, although with a lower potency than pyridostigmine. The physiological role of melatonin in GH neuroregulation remains to be established.


    EUROPEAN JOURNAL OF ENDROCRINOLOGY, 1999, Vol 141, Iss 1, pp 22-26
    2. Melatonin enhances exercise-induced GH secretion

    There is evidence that melatonin may play a role in modulating pituitary secretion, although the mechanisms are unclear. Growth hormone (GH) is secreted by the pituitary gland, which is located on the lower part of the brain under the hypothalamus. The hypothalamus is a part of the brain involved in the functions of the autonomic nervous system, and in endocrine mechanisms, and it appears to play a role in neural mechanisms underlying moods and motivational states. This study examined the effects of a single dose of oral melatonin (5 mg) on exercise-induced GH secretion. Seven healthy males undertook an initial period of graded bicycle ergometric exercise to determine maximum workload and oxygen uptake (VO2max). They were subsequently studied on two further occasions, receiving either melatonin or placebo at the onset of each study. Bicycle exercise was performed for eight min at a workload corresponding to 70% of that achieved at VO2max. Serum GH and IGF-binding protein-1 (IGFBP-1) concentration was measured at 15-min intervals from the onset of the study until 120 min after exercise. Blood was also sampled for the measurement of blood glucose, insulin, non-esterified fatty acids, IGFBP-3, melatonin and vasopressin concentration. The results showed an exercise-induced increase in GH concentration following melatonin that was greater compared with placebo, as assessed by both area under the curve and peak increase in GH levels. The peak increase in IGFBP-1 levels after exercise was also significantly greater following melatonin compared with placebo but did not quite reach levels of significance as measured on a graph by area under the curve. Since exercise-induced GH secretion is thought to be caused indirectly through a hypothalamic pathway, it seems likely that melatonin facilitates GH secretion at a hypothalamic level.
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  9. #9
    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by Fidelitas626 View Post
    LOOOOONG post lol
    #1: Syrian hamsters ... lol ... and it wasn't oral administration

    #2: Dose was impractical - 500 mg of Melatonin

    #3: Dose was impractical - 10 mg of Melatonin

    #4: Dose was impractical - 5 mg of Melatonin. Also, this was refuted in more recent studies with an even higher dose, one being -
    Eur J Appl Physiol. 2006 Apr;96(6):729-39. Epub 2006 Feb 28.
    Effects of resistance exercise session after oral ingestion of melatonin on physiological and performance responses of adult men.
    PMID: 16506061 [PubMed - indexed for MEDLINE]
    Last edited by in10city; 09-19-2007 at 04:11 PM.
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  10. #10
    Registered User pecan's Avatar
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    bump.

    i forgot something: melatonin works BETTER in small dosages. i discovered this by accident, and started suggesting it to family/friends...who also noted the difference.

    1.5mg works wonderfully, and certainly wouldn't affect hormone levels at such a low dose.

    i'll use melatonin in the future also, i just like to rotate supplements (hence the current use of valerian).
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  11. #11
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    Originally Posted by in10city View Post
    #1: Syrian hamsters ... lol ... and it wasn't oral administration
    Hey, he wanted sources, I found some lol.

    But when you think about it, growth hormone peaks in the first few hours after sleep, and T is highest in the morning as well. Melatonin is naturally secreted by your body to tell you to go to sleep, which is why you get tired. So, you go to sleep, and all kinds of fun reactions occur, and GH and T go up.
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  12. #12
    nevigsawkufelgnisaton in10city's Avatar
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    Originally Posted by Fidelitas626 View Post
    Hey, he wanted sources, I found some lol.

    But when you think about it, growth hormone peaks in the first few hours after sleep, and T is highest in the morning as well. Melatonin is naturally secreted by your body to tell you to go to sleep, which is why you get tired. So, you go to sleep, and all kinds of fun reactions occur, and GH and T go up.
    That's what I was hoping your were going to say in the first place

    Melatonin won't directly induce increased GH secretion, but rather it has the ablility to regulate body rhythms and promote normal sleep for those with less than satisfactory patterns - which would facilitate the normal hGH pulsing that occurs during REM sleep ...
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  13. #13
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    Originally Posted by in10city View Post

    it has the ablility to regulate body rhythms and promote normal sleep for those with less than satisfactory patterns - which would facilitate the normal hGH pulsing that occurs during REM sleep ...
    I take 500mcg before bed because I sometimes have trouble sleeping through the night (i.e. waking up 6-7 times). It definitely helps me stay asleep, I usually only wake up to go to the bathroom anymore.
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    Originally Posted by pecan View Post
    bump.

    i forgot something: melatonin works BETTER in small dosages. i discovered this by accident, and started suggesting it to family/friends...who also noted the difference.

    1.5mg works wonderfully, and certainly wouldn't affect hormone levels at such a low dose.

    i'll use melatonin in the future also, i just like to rotate supplements (hence the current use of valerian).
    Didnt do a damn thing for me. Not at 1 mg, not at 5 mg, not at 50 mg.
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  15. #15
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    Originally Posted by Vadim Beliaev View Post
    Didnt do a damn thing for me. Not at 1 mg, not at 5 mg, not at 50 mg.
    I guess it's kinda the same way even creatine doesn't work for some.
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