Douglas Labs

Melatonin P.R. 3mg

Tablets · 180 tablets · 180 servings · $0.26/serving

  • Adults seeking prolonged-release melatonin support for overnight sleep cycles
  • Individuals who wake mid-sleep and want sustained 3mg melatonin delivery
  • Shift workers supporting circadian rhythm reset with timed-release melatonin
  • Dosing · 42% of verified reviews
Quality & Trust Score
85 Strong Evidence
★★★★☆ 4.4 (783) 8 sources
See breakdown →
Manufacturing61
Lab Verification78
Review Consensus93.2
Brand-verified ·Good manufacturing practices verifiedQuality ingredients with verified sourcingClean FDA regulatory recordPositive consumer reviews and community feedbackAuthorized distribution channel verified
Referenced by  A Midwestern Doctor, Dr. Joseph Mercola & Sayer Ji + 8 more →
$47.99
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Ingredients & product label

The complete ingredient list and product label have not yet been published for this item. Please check the manufacturer’s label or contact us before ordering if you need to confirm an ingredient or allergen.

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About Douglas Labs - Melatonin P.R. 3mg

Melatonin P.R. 3mg from Douglas Labs is a prolonged-release melatonin supplement designed to support healthy sleep onset and duration. Unlike immediate-release formats, the prolonged-release delivery gradually disperses 3mg of melatonin over several hours, more closely mimicking the body's natural nocturnal melatonin curve. It's formulated for adults seeking support for occasional sleeplessness or those with disrupted sleep cycles.

Why It's Worth Considering: The prolonged-release matrix distinguishes this from standard fast-dissolve melatonin, making it particularly relevant for individuals who fall asleep easily but struggle to stay asleep through the night.

Why Gabriel Recommends This

Quality & Trust Score: 85 Strong Evidence
Quality Verified
Douglas Labs products are evaluated across 50+ quality signals including manufacturing standards, lab verification, and ingredient sourcing transparency.
Label details
Ingredient amounts and serving sizes are shown in the product label section when supplier information is available.
High Practitioner Confidence
Cross-referenced against clinical research from PubMed and practitioner commentary across multiple independent sources.
Manufacturing Standards
Douglas Labs maintains GMP-certified manufacturing. Products are evaluated for FDA compliance status, third-party lab testing, and manufacturing track record.
Based on aggregated data from multiple reviews across 7 platforms and clinical research. How the Quality & Trust Score works →
Recommendation generated by Gabriel AI based on publicly available practitioner commentary and quality data. Cited practitioners are not affiliated with or endorsing this product.

How to Take

Follow the directions on the label. Product-specific guidance hasn't been published for this item yet.
Ask Gabriel about timing & dosing →

Who Benefits

Best For

  • Adults seeking prolonged-release melatonin support for overnight sleep cycles
  • Individuals who wake mid-sleep and want sustained 3mg melatonin delivery
  • Shift workers supporting circadian rhythm reset with timed-release melatonin
  • Practitioners protocols requiring low-dose extended-release melatonin for sleep maintenance

Cautions

  • Autoimmune conditions (melatonin stimulates immune activity)
  • Depression (may worsen in some individuals)
  • Taking blood thinners or blood pressure medications
  • Children under 3 (consult pediatrician)

What to Expect

1
Day 1
Immediate Effect
Faster sleep onset (20-30 min)
2
Day 1–7
Rhythm Reset
Circadian clock begins recalibrating
3
Week 2–4
Consistent Sleep
Reliable sleep-wake pattern established
4
Month 1+
Maintenance
Use lowest effective dose or cycle periodically
Based on melatonin supplementation research. Works best as a circadian rhythm signal, not a sedative.

Frequently Taken Together

Pure Encapsulations - Magnesium (Glycinate)
Sleep Stack
Magnesium Glycinate
Melatonin signals 'time to sleep' while magnesium glycinate promotes muscle relaxation and GABA activity. The definitive sleep stack.
Pure Encapsulations - Magnesium (Glycinate)
$46.99
Pure Encapsulations - L-Theanine
Calm Without Sedation
L-Theanine
L-theanine reduces pre-sleep anxiety and racing thoughts via alpha brain waves, complementing melatonin's circadian signal.
Pure Encapsulations - L-Theanine
$65.99
Thorne - Glycine
Sleep Quality
Glycine
Glycine lowers core body temperature (a sleep trigger) and improves sleep quality and next-day alertness. Different mechanism than melatonin.
Thorne - Glycine
$31.99

Frequently Asked Questions

  • Start with 0.3-0.5mg, this is the physiological dose that mimics natural production. Most supplements are dosed at 3-10mg which is 10-30x the physiological amount. Higher is NOT better, studies show 0.3mg is often more effective than 3mg because excess melatonin can cause morning grogginess and disrupt the receptor sensitivity.

  • Short-term use (up to 3 months) is well-established as safe. Long-term nightly use is common but some practitioners recommend periodic breaks (5 nights on, 2 off) to maintain receptor sensitivity. Melatonin does not cause dependence, your body still produces its own. However, addressing the root cause of insomnia (light exposure, stress, caffeine timing) is always preferred.

  • You're likely taking too much. The most common mistake is using 3-10mg when 0.3-1mg is sufficient. Melatonin is a circadian signal, not a sedative, excess stays in your system and causes morning drowsiness. Try cutting your dose in half. Also, take it 30-60 minutes before bed, not right at bedtime.

  • Yes, this is one of melatonin's best-studied uses. Take 0.5-3mg at the destination's bedtime for 3-5 days after arrival. For eastward travel (harder adjustment): start taking melatonin at destination bedtime 1-2 days before departure. For westward: take melatonin only upon arrival.

Real Reviews. Real Sources.

4.4
783 reviews
5 star
55%
4 star
25%
3 star
10%
2 star
6%
1 star
4%
All (783)
10 Clinical Research
iHerb
0 iHerb
Amazon
600 Amazon
11 Practitioners
Reddit
47 Reddit
X
30 X
TikTok
30 TikTok
Instagram
30 Instagram
Substack
5 Substack
783 ratings aggregated across 8 sources · full-text reviews below
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Apotheca's Analysis · 50+ Signals Across 6 Dimensions
Online discourse around melatonin is largely skeptical, citing improper dosing, limited efficacy for insomnia, and risks of grogginess and dependence.
Dosing
42%
Effectiveness
31%
Side Effects
22%
Sleep Quality
38%
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Compatibility Guide

Works Well With

Ask Gabriel for personalized stacking recommendations.

Take Separately From

No significant interactions identified. Always consult your healthcare provider.

Research Behind This

Douglas Labs Product Quality Assessment
Quality & Trust Score Analysis
This product has been evaluated across 50+ quality signals including third-party testing, manufacturing standards, ingredient sourcing, and clinical evidence. Douglas Labs products are analyzed against our comprehensive database of practitioner-grade supplements.
Practitioner Network Endorsement Data
Apotheca Practitioner Intelligence
Douglas Labs is referenced across our practitioner network of clinical recommendations, YouTube health channels, and professional forums. Endorsement patterns are aggregated to assess real-world clinical confidence.

Practitioner Insights

Who This Is For

✓ Great For

Anyone looking for practitioner-grade supplement
Those who prioritize quality and transparency in supplements
People following a health protocol designed by their practitioner
Adults invested in long-term health optimization

⚠ Important Notes

Always consult your healthcare provider before starting any supplement
Check for interactions with current medications
If pregnant or nursing, seek professional guidance first
Compare options using Apotheca's AI to find the best fit for your goals
Douglas Labs is part of Gabriel's curated marketplace of practitioner-grade supplement brands. Every product from Douglas Labs is evaluated across 50+ quality signals including manufacturing standards, ingredient sourcing, third-party testing, and clinical evidence.
Gabriel VerifiedQuality Analyzed

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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Douglas Labs
Douglas Labs - Melatonin P.R. 3mg
85
Strong Evidence
Quality & Trust Score
Strong quality signals. Meets recommended thresholds across most pillars.
Last updated: September 08, 2026
Score Breakdown
Manufacturing & GMP
61
Lab Verification
78
Review Consensus
93.2
Practitioner Confidence
57.0
Community & Social
56
Transparency
72
Consumer & Practitioner Intelligence
★★★★☆ 4.4 from 783 reviews across 8 sources
Clinical Research 30Practitioner Data 11Amazon 600Community 142+
Aggregated from verified purchases, practitioner clinical notes, and real-world outcome data
Scored across 50+ quality dimensions from 15+ independent databases. No brand can pay to influence their score. No sponsored rankings. Ever.
See how this product scores against your health profile · How the Quality & Trust Score works