<p>Melatonin is believed to be responsible for the synchrony of circadian rhythm, modulating sleep patterns with day and night.</p>
<p>Melatonin is an <a href="/Antioxidant.php">antioxidant</a> and protects tissues from oxidative damage by <a href="/free-radical.php">free radical</a> elements. Further more, melatonin induces synthesis of endigenous antioxidants such as superoxide dismtase (SOD).</p>
<p>Several researches indicate that melatonin protects the gastrointestinal tract from irritation, reduces stress-induced lesion formation and heals ulcer.</p>