Melatonin CAS: 73-31-4

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I. Core Structure & Key Traits

1. Molecular Composition
   
   
   Melatonin is derived from the amino acid tryptophan via a two-step biosynthetic pathway: tryptophan is first converted to serotonin, then acetylated and methylated to form melatonin. Its chemical structure features an indole ring, an acetylamino group, and a methoxy group, which enable it to cross the blood-brain barrier efficiently and bind to specific receptors.
2. Formulation & Storage
   
   
   It is commercially available in various forms, including oral tablets, capsules, sublingual lozenges, and topical creams. For raw material storage, melatonin should be kept in a sealed container at 2–8°C away from light and heat, as it is prone to degradation under ultraviolet radiation and high temperatures.
3. Endogenous Secretion Rhythm
   
   
   Endogenous melatonin secretion exhibits a distinct circadian pattern: levels rise in the evening, peak during the middle of the night, and decline to undetectable levels by morning. This rhythm is regulated by the suprachiasmatic nucleus (SCN) of the hypothalamus, which responds to light-dark cycles.

II. Mechanisms of Action

1. Circadian Rhythm Regulation
   
   
   Melatonin exerts its primary effects by binding to G-protein-coupled melatonin receptors (MT₁ and MT₂) expressed in the SCN, retina, and peripheral tissues. Activation of MT₁ receptors suppresses neuronal firing in the SCN, promoting sleep onset; MT₂ receptor activation modulates the phase of circadian rhythms, helping align the body’s internal clock with external light-dark cycles.
2. Antioxidant Activity
   
   
   As a potent free radical scavenger, melatonin directly neutralizes reactive oxygen species (ROS) and reactive nitrogen species (RNS) without being depleted. It also stimulates the activity of endogenous antioxidant enzymes (e.g., superoxide dismutase, glutathione peroxidase) and enhances mitochondrial function, reducing oxidative stress in cells and tissues.
3. Other Physiological Effects
   • Immunomodulation: Enhances immune cell activity and cytokine production, supporting immune system function.
   • Reproductive Regulation: Inhibits the secretion of gonadotropin-releasing hormone (GnRH) in some species, regulating reproductive cycles.
   • Neuroprotection: Reduces neuronal damage caused by ischemia, hypoxia, or neurodegenerative conditions by mitigating oxidative stress and inflammation.
   
   

III. Applications & Research Value

1. Sleep Disorders Management
   
   
   Clinically and commercially used to alleviate insomnia, jet lag, and sleep disturbances associated with shift work. It is particularly effective for regulating sleep-wake cycles in individuals with delayed sleep phase syndrome.
2. Aging & Neurodegenerative Disease Research
   
   
   Studied for its potential anti-aging effects, as endogenous melatonin levels decline with age. Preclinical studies explore its protective role in Alzheimer’s disease, Parkinson’s disease, and other neurodegenerative disorders by reducing oxidative damage and neuroinflammation.
3. Dietary Supplement & Wellness Use
   
   
   Widely used as an over-the-counter supplement to promote sleep quality and overall well-being. It is also incorporated into cosmetic products for its antioxidant properties, which may help reduce skin aging caused by UV radiation.
4. Veterinary & Agricultural Applications
   
   
   Used in livestock farming to regulate the circadian rhythms of animals, improving feed efficiency and reproductive performance. It also helps protect plants from environmental stressors such as drought and salinity.