Understand the source comparison
Melatonin for Jet Lag: Method Comparison
Melatonin protocols vary widely in published literature. The table below compares the most studied approaches based on clinical trial data, focusing on timing strategy, dose range, and outcome evidence. Pre-Flight Circadian Priming Begin 3 days before travel.
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Melatonin protocols vary widely in published literature. The table below compares the most studied approaches based on clinical trial data, focusing on timing strategy, dose range, and outcome evidence.
- Pre-Flight Circadian Priming
- Begin 3 days before travel. Dose at destination bedtime (converted to home time)
- 0.5–2mg immediate-release
- Gradual phase shift starts before departure
- Moderate. Small trials (n=60–120) show 20–30% faster adaptation
- Best for long eastward flights (>6 time zones). Requires planning but reduces Day 1–2 impairment.
- Destination-Only Protocol
- First dose on arrival night at local bedtime, continue 5–7 nights
- 0.5–3mg immediate-release
- Phase shift begins night 1, accumulates daily
- Strong. Supported by Cochrane meta-analysis (n=796)
- Most practical for travelers who don't pre-plan. Effective for 4–8 hour eastward shifts. No benefit westward <4 zones.
- Split-Dose Protocol
- 0.5mg upon waking + 2mg at destination bedtime
- Morning: 0.5mg; Evening: 2mg
- Mixed. Morning dose may enhance light-driven phase delay
- Weak. Limited to 2 small studies, conflicting results
- Not recommended. Morning dosing outside PRC window shows no added benefit and increases daytime sedation risk.
- High-Dose Sedative Approach
- 5–10mg taken when traveler "wants to sleep"
- 5–10mg immediate or sustained-release
- Sedation within 60–90 min, no reliable phase shift
- Poor. Dosing not aligned with circadian biology
- Common in consumer use but ineffective for jet lag. Produces subjective sleepiness without accelerating circadian adaptation.
- The destination-only protocol using 0.5–3mg immediate-release melatonin at destination bedtime for 5–7 consecutive nights represents the most evidence-backed approach. Pre-flight priming adds marginal benefit for extreme time zone shifts (8+ hours) but is unnecessary for most travel.