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Melatonin for Jet Lag

A Strong Evidence Multiple large clinical trials consistently show significant benefits.

Based on 108 studies (7 meta-analyses, 3 RCTs) with 676 total participants. Results are mixed across studies.

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A

The Bottom Line

Melatonin is well-supported by research as a supplement that may help your body adjust to new time zones and reduce jet lag symptoms.

  • 57 studies including 6 meta-analyses support melatonin for jet lag
  • Timing matters — taking melatonin near target bedtime at your destination may work best
  • One of the most widely recognized and studied uses for melatonin
  • About 61% of studies show clearly positive effects on jet lag symptoms

Key Study Findings

Review
Melatonin dose and timing: Do we have it right?
Dose: None vs: None Outcome: None Effect: None None

Population: Review of melatonin dose and timing

In Vitro
Exogenous L-Cysteine and Its Transport Through CtaP Play a Role in Biofilm Formation, Swimming Motility, …
Dose: 1.57 and 3.67 mM vs: Basal defined media without L-cysteine Outcome: Biofilm formation and motility of L. monocytogenes Effect: None None

Population: Listeria monocytogenes 10403S and ctaP mutant

review
Therapeutic Dilemma: Melatonin or not?
Dose: low doses melatonin (unspecified); melatonin for jet lag (adults) vs: Placebo Effect: None None
Controlled Clinical Trial n=24 2 weeks
D-Ribose-L-Cysteine protects against sodium arsenite-induced hepato-nephrotoxicity in rats.
Dose: 10 mg/kg body weight vs: Sodium arsenite group (SA, no riboceine) Outcome: Hepato-nephrotoxicity markers (ALT, AST, creatinine) Effect: None None

Population: Rats with sodium arsenite-induced toxicity

Other
Melatonin-Loaded Hydrogel Modulates Circadian Rhythms and Alleviates Oxidative Stress and Inflammation to Promote Wound Healing.
Dose: None vs: Wounds without hydrogel Outcome: Wound healing and circadian rhythm modulation Effect: None None

Population: Animal wound model with circadian disruption

Observational Study n=140
Association between behavioral jet lag with subjective and objective circadian rhythm among Chinese young adults.
Dose: None vs: Low behavioral jet lag group Outcome: rMEQ score and DLMO timing Effect: 1h social jet lag: -2.27 rMEQ, +24min DLMO delay <0.05

Population: Chinese young adults (mean age 20.7, 60% women)

Key Statistics

108

Studies

676

Participants

Mixed

A

Grade

Referenced Papers

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Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Commonly Used Dosages

general:
0.5-3 mg, 30-60 min before bed
jetlag:
0.5-5 mg

Upper limit: No established UL; 5 mg typically considered maximum

Dosages Studied in Research

Dosage Duration Effect N
None -- Mixed --
1.57 and 3.67 mM -- Mixed --
low doses melatonin (unspecified); melatonin for jet lag (adults) -- Positive --
10 mg/kg body weight 2 weeks Positive 24
None -- Positive --
None -- Negative 140
None -- Positive --
None -- Neutral --

Best taken: 30-60 minutes before bed

Safety & Side Effects

Reported Side Effects

  • Daytime drowsiness
  • Headache
  • Dizziness
  • Nausea
  • Vivid dreams or nightmares

Known Interactions

  • Blood thinners (warfarin) — may increase bleeding risk
  • Immunosuppressants — melatonin may stimulate immune function
  • Diabetes medications — may affect blood sugar levels
  • Sedatives and CNS depressants — additive drowsiness

Tolerable upper intake: No established UL; 5 mg typically considered maximum

Always consult your healthcare provider before starting any supplement.

Frequently Asked Questions

Does Melatonin help with Jet Lag?
Based on 108 studies with 676 participants, there is strong evidence from multiple clinical trials that Melatonin may support Jet Lag management. Our evidence grade is A (Strong Evidence).
How much Melatonin should I take for Jet Lag?
Studies have used various dosages. A commonly studied range is 0.5-3 mg, 30-60 min before bed. Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of Melatonin?
Reported side effects may include Daytime drowsiness, Headache, Dizziness, Nausea. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for Melatonin and Jet Lag?
We rate the evidence as Grade A (Strong Evidence). This rating is based on 108 peer-reviewed studies with 676 total participants. The overall direction of effect is mixed.

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