Melatonin

Mechanisms:

• Binds to MT1 and MT2 receptors in the suprachiasmatic nucleus (SCN)
• Signals "biological darkness" to the brain
• Reduces core body temperature (promotes sleep onset)
• Synchronizes peripheral circadian clocks
• Acts as an antioxidant (particularly in mitochondria)
• Modulates immune function

Key studies:

• Ferracioli-Oda et al. (2013): Meta-analysis of 19 RCTs showing reduced sleep latency and improved sleep quality
• Herxheimer & Petrie (2002): Cochrane review confirming efficacy for jet lag
• Brzezinski et al. (2005): Meta-analysis of 17 studies on sleep parameters

Effect sizes:

• Sleep onset latency: Reduced by ~7 minutes (CI: 4-10 min)
• Total sleep time: Increased by ~8 minutes
• Sleep quality: Improved (standardized mean difference 0.22)
• Jet lag severity: Significantly reduced across 5+ time zones

Endogenous production:

• Naturally produced by the pineal gland
• Suppressed by light exposure (especially blue light)
• Peaks around 2-3 AM in most adults
• Declines significantly with age

Dosing for sleep:

• Start with 0.5mg - many people respond to low doses
• Standard range: 0.5-3mg
• Higher doses (5-10mg) not more effective and may cause grogginess
• Take 30-60 minutes before desired sleep time
• Sublingual forms act faster than pills

Dosing for jet lag:

• 0.5-5mg at destination bedtime
• Start on arrival day, continue for 2-5 days
• More effective traveling east than west
• Works best crossing 5+ time zones

Timing optimization:

• Consistent timing is key - same time each night
• Earlier dosing (2-3 hours before bed) can help shift circadian phase
• For delayed sleep phase: take 5-6 hours before natural sleep time
• Avoid bright light after taking melatonin

Forms:

• Immediate-release: Best for sleep onset issues
• Extended-release: May help with sleep maintenance
• Sublingual: Fastest absorption
• Gummies: Often contain added sugar

Common mistakes:

• Taking too much (more is not better)
• Taking too late (right at bedtime vs. 30-60 min before)
• Inconsistent timing
• Exposure to bright light after taking

Known side effects (generally mild):

• Morning grogginess (usually from high doses)
• Vivid dreams
• Headache (rare)
• Dizziness (rare)
• Nausea at high doses

Contraindications:

• Autoimmune conditions (may modulate immune function)
• Pregnancy and breastfeeding (insufficient data)
• Depression (some concern about worsening symptoms)
• Bleeding disorders (may affect clotting)

Drug interactions:

• Blood thinners (warfarin) - may enhance effect
• Immunosuppressants - may interfere
• Diabetes medications - may affect blood sugar
• Sedatives/CNS depressants - additive effects
• Birth control pills - may increase melatonin levels

Safety notes:

• Generally recognized as safe (GRAS) for short-term use
• Long-term studies up to 2 years show good safety profile
• Does not appear to suppress natural production
• Not habit-forming

Ideal for:

• Frequent travelers crossing time zones
• Shift workers rotating schedules
• People with delayed sleep phase (night owls)
• Older adults (natural melatonin declines with age)
• Those with difficulty falling asleep (not staying asleep)
• Blind individuals (for circadian entrainment)

Should approach cautiously:

• Pregnant or breastfeeding women
• Those with autoimmune conditions
• People taking immunosuppressants
• Those with depression (consult doctor)

Best responders:

• Those with clear circadian disruption
• Older adults (50+)
• People whose sleep onset is the main issue
• Travelers crossing 5+ time zones

What to measure:

• Time to fall asleep (sleep latency)
• Wake time consistency
• Sleep quality (1-10 subjective scale)
• Morning alertness
• Jet lag recovery time

Tools:

• Sleep tracker or smartwatch
• Sleep diary (pen and paper works)
• Oura Ring for detailed sleep staging

Signs it's working:

• Falling asleep faster (within 15-20 min)
• More consistent wake time
• Feeling refreshed in the morning
• Faster jet lag recovery

Signs to adjust:

• Morning grogginess (try lower dose)
• No effect (try different timing)
• Waking up too early (may need extended-release)

Recommended brands:

• NOW Foods Melatonin - GMP certified, multiple doses available
• Life Extension Melatonin - High quality, various formulations
• Natrol Melatonin - Popular, time-release option available

Low-dose options (recommended to start):

• NOW Foods 1mg - Good starting dose
• Source Naturals 0.5mg - Sublingual, fast-acting

Extended-release:

• Natrol Time Release - For sleep maintenance issues

What to avoid:

• Doses above 10mg (no added benefit)
• Products with excessive additives
• Unverified brands (quality varies widely)

Typical costs:

• Basic tablets: $0.03-0.05/dose
• Quality brands: $0.05-0.10/dose
• Extended-release: $0.10-0.15/dose
• Sublingual: $0.08-0.12/dose

Cost comparison (90-day supply):

• Budget option: ~$8-12
• Quality brand: ~$10-15
• Extended-release: ~$15-20

Cost-per-benefit assessment:

Melatonin is extremely cost-effective. Even premium brands cost less than $0.15/dose, making it one of the cheapest evidence-based sleep interventions available.

Researchers:

• Russel Reiter, PhD - Leading melatonin researcher, 1000+ publications
• Richard Wurtman, MD - MIT, early melatonin research pioneer

Practitioners:

• Andrew Huberman, PhD - Low-dose protocols, timing optimization
• Matthew Walker, PhD - Sleep science context

Reddit communities:

• r/sleep - General sleep optimization
• r/Supplements - Melatonin discussions
• r/Nootropics - Dosing optimization

Common positive reports:

• "0.5mg works better than the 10mg I was taking"
• "Game changer for jet lag - recovered in 2 days instead of a week"
• "Finally falling asleep within 20 minutes"
• "Vivid dreams but worth it for the sleep quality"

Common complaints:

• "Made me groggy until I lowered the dose"
• "Doesn't help me stay asleep"
• "Vivid dreams can be disturbing"
• "Stopped working after a while" (often timing issue)

Pairs well with:

• Morning sunlight - Anchors circadian rhythm (AM light + PM melatonin)
• Blue light blocking - Preserves natural melatonin production
• Sleep environment - Optimize temperature and darkness
• Magnesium glycinate - Complementary mechanisms for sleep
• Glycine - Lowers core body temperature

Protocol stack for jet lag:

1. Melatonin at destination bedtime
2. Morning bright light upon waking
3. Avoid caffeine after noon destination time
4. Time meals to destination schedule

Protocol stack for sleep onset:

1. Blue light blocking 2 hours before bed
2. Melatonin 30-60 minutes before target sleep time
3. Cool bedroom (65-68F / 18-20C)
4. Consistent wake time (even weekends)

Avoid combining with:

• Alcohol (disrupts sleep architecture)
• Late caffeine (blocks adenosine, confuses signals)
• Bright screens after taking melatonin