The supplement market is flooded with jet lag products, but most contain a handful of core ingredients. Here's an honest ranking of what the evidence actually supports — so you can make an informed choice before your next long-haul flight.
1. Melatonin — Tier 1 (Strong Evidence)
The gold standard. Multiple randomised controlled trials confirm melatonin reduces jet lag severity and speeds circadian adjustment, particularly when flying east. Optimal dose: 0.5–3mg taken at destination bedtime. Available over the counter in Australia.
2. Magnesium — Tier 2 (Good Supporting Evidence)
Magnesium glycinate and magnesium threonate support sleep quality and reduce cortisol. Not a direct circadian reset agent, but improves the depth and restorative quality of sleep during adjustment. 200–400mg before bed is a common dose.
3. L-Theanine — Tier 2 (Good Supporting Evidence)
An amino acid found in green tea, L-theanine promotes calm alertness without sedation. Useful for managing anxiety-related sleep disruption during travel. Often stacked with low-dose caffeine for daytime alertness at the destination.
4. Ashwagandha — Tier 3 (Emerging Evidence)
An adaptogenic herb that helps regulate cortisol and stress response. Some evidence for improving sleep quality under stress conditions. Less direct evidence for jet lag specifically, but popular among frequent flyers.
5. Vitamin B12 — Tier 3 (Limited Evidence)
Some studies suggest B12 may influence circadian rhythm regulation. Evidence is weak but the supplement is low-risk and commonly included in jet lag formulas.
6. Valerian Root — Tier 3 (Mixed Evidence)
A traditional sleep aid with inconsistent clinical results. May help some travellers fall asleep faster but can cause grogginess in others. Use with caution on travel days.
Ingredients to Avoid
- High-dose melatonin (5–10mg) — more isn't better; causes grogginess and can worsen timing
- Diphenhydramine (antihistamine sleep aids) — suppresses REM sleep and causes next-day cognitive fog
- Alcohol-based tinctures — counterproductive for sleep quality
What to Look for in a Jet Lag Supplement
- Low-dose melatonin (0.5–3mg) as the primary ingredient
- Magnesium glycinate or threonate (not oxide)
- No proprietary blends that hide individual doses
- Third-party tested for purity
Our Pick for Australian Travellers
Jet Ease Tablets are a purpose-formulated jet lag supplement trusted by Australian long-haul travellers. Compact 32-tablet pack — ideal for carry-on. If you also experience travel sickness, the Jet Ease & Tripease combo addresses both conditions in one purchase.