{"id":29646,"date":"2025-12-01T11:50:10","date_gmt":"2025-12-01T10:50:10","guid":{"rendered":"https:\/\/www.neolifesalud.com\/?p=29646"},"modified":"2025-12-01T11:50:10","modified_gmt":"2025-12-01T10:50:10","slug":"melatonin-from-sleep-to-the-gut-brain-heart-axis","status":"publish","type":"post","link":"https:\/\/www.neolifesalud.com\/en\/blog\/hormonal-balance\/melatonin-from-sleep-to-the-gut-brain-heart-axis\/","title":{"rendered":"Melatonin: from sleep to the gut-brain-heart axis"},"content":{"rendered":"<hr \/>\n<h1 style=\"text-align: justify;\">Melatonin has evolved from being considered merely the \u201csleep hormone\u201d to a systemic modulator with significant effects on cardiovascular, metabolic, immune, and cognitive health. Recently, some controversy arose following the publication of preliminary observational data suggesting a possible association between long-term melatonin use and an increased risk of heart failure.<\/h1>\n<p style=\"text-align: justify;\">However, a critical review and detailed analysis of the information published by the American Heart Association (AHA) indicate that these types of studies do not establish a causal relationship and have important limitations. This is because they rely on large population databases and lack control over key factors such as dosage, duration of use, comorbidities, and participants\u2019 sleep quality. These limitations reduce the clinical relevance of the findings, which should be interpreted as hypothesis-generating rather than definitive conclusions. For this reason, at Neolife we aim to share, with scientific rigor, the beneficial properties of melatonin beyond its role in regulating the circadian rhythm.<\/p>\n<p style=\"text-align: justify;\"><em> Dr. S\u00e1nchez &#8211; Neolife Medical Team <\/em><\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>Beyond Sleep: A Key Molecule in Global Homeostasis<\/strong><\/p>\n<p style=\"text-align: justify;\">To date, no randomized clinical trials have confirmed any direct adverse effect of melatonin on the cardiovascular system. On the contrary, improving sleep quality\u2014one of its main functions\u2014helps reduce the risk of hypertension, diabetes, inflammation, and cardiovascular mortality.<\/p>\n<p style=\"text-align: justify;\">What we do know about melatonin is that it shortens sleep latency and improves overall sleep quality, particularly in cases of sleep-onset insomnia. Moreover, it has a clear antioxidant effect and acts as an immune regulator with potential neuroprotective properties. And, importantly, it has a superior safety profile compared to benzodiazepines\u2014melatonin does not cause dependence or cognitive impairment.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-1057 size-large\" src=\"https:\/\/www.neolifesalud.com\/wp-content\/uploads\/Melatonina-1-1.png\" alt=\"melatonin\" width=\"1024\" height=\"683\" \/><\/p>\n<p style=\"text-align: justify;\">In recent years, <strong>melatonin <\/strong>has been found to play a fundamental role in maintaining the balance of the gut microbiome, opening up new therapeutic perspectives. It is now known that the gut contains concentrations of melatonin up to 400 times higher than those found in the brain. Melatonin is not only produced in the pineal gland but also in the gastrointestinal tract, where it acts locally on enteric receptors to modulate motility, immunity, and intestinal permeability.<br \/>\nThis production occurs through intestinal bacteria, which can influence the conversion of tryptophan into serotonin\u2014and subsequently into melatonin\u2014directly affecting both its <strong>systemic production and function<\/strong>. This explains why patients with dysbiosis (an imbalance in the gut flora) often experience sleep disturbances, circadian rhythm alterations, and mood disorders.<br \/>\nMelatonin promotes the growth and maintenance of beneficial bacteria such as Lactobacillus and Bifidobacterium, while reducing pro-inflammatory species (LPS-producing bacteria), thus promoting a state of eubiosis (microbial balance). This activity helps reduce intestinal inflammation, improve mucosal integrity, and enhance immune response.<\/p>\n<p style=\"text-align: justify;\"><strong>Melatonin<\/strong> is the only hormone with antioxidant properties, and its interaction with the microbiota reduces <strong>oxidative stress<\/strong> and inflammatory markers (TNF-alpha, IL-6), improving insulin sensitivity, lipid metabolism, and neuroendocrine regulation through the gut\u2013brain axis.<\/p>\n<p style=\"text-align: justify;\">Multiple studies suggest potential benefits of melatonin as an adjunct treatment in irritable bowel syndrome, stress- or antibiotic-induced dysbiosis, metabolic diseases (such as insulin resistance and obesity), and neurodegenerative disorders including Parkinson\u2019s and Alzheimer\u2019s.<\/p>\n<p style=\"text-align: justify;\">Paradoxically, the same mechanisms that some observational studies have linked to <strong>cardiovascular harm<\/strong> are, in fact, those that protect the endothelium and reduce systemic inflammation, as supported by physiological evidence. Through its antioxidant action and its influence on the gut microbiome, <strong>melatonin<\/strong> reduces lipid peroxidation, enhances mitochondrial function (ATP production, i.e., energy), promotes a healthier lipid profile, regulates blood pressure and heart rate variability, and modulates the autonomic balance between the sympathetic and parasympathetic systems (vagal tone).<\/p>\n<p style=\"text-align: justify;\">The bidirectional interaction between <strong>melatonin<\/strong> and the microbiome is emerging as an essential mechanism in the regulation of multiple physiological functions. Modulating this axis represents a promising therapeutic pathway in inflammatory, metabolic, and neurological disorders.<\/p>\n<p style=\"text-align: justify;\">In this context, <strong>melatonin<\/strong> transcends its traditional role as a sleep regulator\u2014it acts as a global modulator of the circadian\u2013immune\u2013microbial axis, with far-reaching <strong>effects on cardiovascular<\/strong>, metabolic, and neuroendocrine health.<\/p>\n<p style=\"text-align: justify;\">Taken together, melatonin\u2019s overall impact on the body is protective and homeostatic, especially when dosing and treatment are personalized by healthcare professionals.<br \/>\nAt <strong>Neolife<\/strong>, the regulation of the circadian rhythm and quality sleep are considered fundamental pillars of treatment, with proven benefits for our patients\u2019 well-being. We know that <strong>melatonin supplementation <\/strong>can help restore gut ecosystem balance (eubiosis) and serve as an adjunct therapy in conditions such as irritable bowel syndrome, stress-induced dysbiosis, and certain metabolic or neurodegenerative diseases.<\/p>\n<p style=\"text-align: justify;\">The current clinical challenge lies in personalizing its use, adapting it to each individual\u2019s age, chronotype, gut microbiome status, comorbidities, and clinical goals. While we await further research, current evidence supports a rational, safe, and medically supervised use of melatonin within a comprehensive, integrative approach to overall health and <strong>healthy longevity<\/strong>.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\">BIBLIOGRAPHY<\/p>\n<p>(1) Iesanu, M. I., Zahiu, C. D. M., Dogaru, I.-A., Chitimus, D. M., Pircalabioru, G. G., Voiculescu, S. E., Isac, S., Galos, F., Pavel, B., O\u2019Mahony, S. M., &amp; Zagrean, A.-M. (2022). Melatonin\u2013Microbiome Two-Sided Interaction in Dysbiosis-Associated Conditions. <em>Antioxidants<\/em>, <em>11<\/em>(11), 2244. <a href=\"https:\/\/doi.org\/10.3390\/antiox11112244\">https:\/\/doi.org\/10.3390\/antiox11112244<\/a><\/p>\n<p>(2) American Heart Association. <em>Long-term use of melatonin supplements to support sleep may have negative health effects.<\/em> News release, 3 Nov 2025.<\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>Melatonin has evolved from being considered merely the \u201csleep hormone\u201d to a systemic modulator with significant effects on cardiovascular, metabolic, immune, and cognitive health. Recently, some controversy arose following the publication of preliminary observational data suggesting a possible association between long-term melatonin use and an increased risk of heart failure. However, a critical review and [&hellip;]<\/p>\n","protected":false},"author":30,"featured_media":29630,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[333],"tags":[935,412,337,4082,171,4980,388,190,713,1609],"class_list":["post-29646","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hormonal-balance","tag-brain","tag-cardiovascular-system","tag-circadian-rhythm","tag-estres-oxidativo-en","tag-health","tag-healthy-longevity","tag-heart","tag-hormone","tag-melatonin","tag-microbiota"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Melatonin: from sleep to the gut-brain-heart axis<\/title>\n<meta name=\"description\" content=\"Melatonin has evolved from being considered a &quot;sleep hormone&quot; to a systemic modulator with significant effects on cardiovascular, metabolic, immune, and cognitive health. 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