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Melatonin – The sleep hormone for better regeneration
What is Melatonin?
Melatonin is a hormone produced by the pineal gland in the brain and plays a central role in regulating the circadian rhythm – the internal sleep-wake cycle. It is released in the dark, signaling to the body that it is time to sleep. As a supplement, melatonin is synthetically produced and is one of the most widely used remedies for sleep problems worldwide. Unlike traditional sleeping pills, it is not addictive and hardly negatively affects sleep architecture.
Biochemical Mechanism of Action
Melatonin binds to MT1 and MT2 receptors in the suprachiasmatic nucleus of the hypothalamus, the central "pacemaker" of the circadian rhythm. This binding inhibits the activity of neurons responsible for wakefulness and promotes the transition to sleep. Melatonin is also a potent antioxidant: it directly neutralizes free radicals and stimulates endogenous antioxidant enzymes such as superoxide dismutase and glutathione peroxidase. Melatonin secretion is inhibited by light – especially blue light – via the retinohypothalamic tract.
Scientifically Proven Effects
| Effect | Evidence Level | Effect Size |
|---|---|---|
| Shortening sleep onset latency | Strong (numerous RCTs, meta-analyses) | Low–Medium |
| Alleviation of jet lag | Strong (several RCTs) | Medium–High |
| Improvement for shift work | Moderate (some studies) | Low–Medium |
| Antioxidant effect | Moderate (in vitro + some in vivo) | Medium |
| Sleep quality in older individuals | Moderate (several studies in older adults) | Medium |
Dosage & Intake
| Goal | Recommended Dose | Time of Intake |
|---|---|---|
| General sleep aid | 0.5–1 mg | 30–60 min before sleep |
| Jet lag (traveling east) | 2–5 mg | At bedtime in destination |
| Shift work | 1–3 mg | Immediately before planned sleep |
| Antioxidant use | 3–10 mg | In the evening |
Low doses (0.5–1 mg) are often just as effective as higher ones and have fewer side effects. Sustained-release formulations may be beneficial for maintaining sleep.
Synergies & Combinations
Melatonin works particularly well in combination with L-theanine, which promotes relaxation without causing sedation. Magnesium glycinate supports muscle relaxation and complements the sleep-promoting effect. Ashwagandha can further improve sleep quality by lowering cortisol. Combinations with alcohol or other sedating substances should be avoided.
Possible Side Effects & Contraindications
At low doses, melatonin is well tolerated. Occasionally, headaches, next-morning drowsiness, mood swings, or vivid dreams may occur. For autoimmune diseases, intake should be discussed with a doctor. Pregnant and breastfeeding women should avoid melatonin. In children, use only under medical supervision.
Frequently Asked Questions (FAQ)
Is melatonin addictive?
No. Unlike traditional sleeping pills, melatonin has no addictive potential. The body's own production is not permanently reduced by taking it.
Can I take melatonin long-term?
Short-term use over weeks to a few months is well documented. Data for long-term use are still limited – a time-limited application is recommended.
Why doesn't melatonin work for me?
Individual reactions vary greatly. Sometimes a different dosage or a different time of intake helps. Good sleep hygiene – no bright light after intake, cool sleep environment, no caffeine in the evening – is equally important.
Conclusion
Melatonin is a safe, well-researched supplement for sleep problems, jet lag, and regulating the sleep rhythm. It is particularly effective at low doses and in combination with good sleep hygiene – ideal for frequent travelers, shift workers, and people with difficulty falling asleep.
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