1 Protocol
Hours
:
Mins
Optimal Protocol
Take At
90-120 mins before bed
8:00 PM
Your Dose
Clinically effective range
3 mg
Function
Helps signal onset of sleep
Circadian Shift
Method and basis
How the figure above is derived, and when not to act on it.
Less is More
MIT research suggests that 0.3 mg is the optimal physiological dose. Most supplements (3mg, 5mg, 10mg) are vastly overdosed, leading to grogginess.Melatonin Dosage Guide
| Dosage | User Type | Effect | Side Effect Risk |
|---|---|---|---|
| 0.3 - 0.5 mg** | **Recommended | Optimal phase shift | Low |
| 1 - 3 mg | Standard US Dose | Strong sedative effect | Moderate (Grogginess) |
| 5 - 10 mg | High Dose | Supraphysiological | High (Vivid Dreams, Headache) |
Timing
Take melatonin 90-120 minutes before desired bedtime. It signals "darkness" to the brain, shifting the circadian phase.WinSport Editorial & Research Standards
All formulas and reference values used in this tool are sourced from peer-reviewed scientific literature and validated clinical guidelines. Our research team continuously audits each calculator for accuracy and updates methodology as new evidence emerges.
Read the Science
Sports Science Articles- Melatonin for Jet Lag: The Timing Protocol That Actually WorksMelatonin timing is everything. A 1mg dose taken at the right circadian phase outperforms 10mg at the wrong time. For travelling athletes and shift workers, the difference is measurable in performance.4 min read
- Melatonin Dose: Why 0.5mg Outperforms 5mg for AthletesZeitzer 2000 proved 0.3–0.5mg melatonin is as effective as 3mg for circadian phase-shifting. Most pharmacy doses are 10–100× too high. Here's the receptor pharmacology behind the paradox.5 min read
- Blue Light and Athlete Sleep: The 90-Minute Melatonin DelayBlue light from screens delays melatonin onset by 60–90 minutes and reduces total sleep time. For athletes, that suppression window is their primary recovery period.5 min read
Explore More Tools
View All Tools- Sleep Cycle Calculator — Best Bedtime and Wake Time by 90-Minute CyclesFind your optimal bedtime or wake-up time based on 90-minute REM sleep cycles.
- Sleep Performance Calculator for AthletesCalculate your optimal sleep duration by sport, training load, and competition schedule. Evidence-based recommendations from NCAA and military performance research.
- Caffeine Half-Life CalculatorFind out when your coffee leaves your system so you can sleep.
Get the weekly research brief
One email per week. New calculators, methodology updates, and sports science summaries.