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Life Extension vs NOW Foods Melatonin (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
Life Extension (A overall) outscores NOW Foods (B+ overall) primarily because its low-dose formulation better aligns with current clinical evidence on optimal melatonin dosing. NOW Foods' 3mg dose is not harmful but is likely higher than most people need. Life Extension's cost per day is slightly higher, but the dose advantage justifies it. For evidence-based melatonin use, Life Extension's low-dose approach is the better choice.
Melatonin 300 mcg (0.3mg)
Life Extension
Melatonin 3mg
NOW Foods
Head-to-Head Comparison
| Category | Melatonin 300 mcg (0.3mg) Life Extension | Melatonin 3mg NOW Foods |
|---|---|---|
| Overall | A | B+ |
| Evidence | A | B+ |
| Quality & Purity | B+ | B |
| Value | A | A |
| Transparency | A | A |
| Cost/Day | $0.05 | $0.04Winner |
| Dose/Serving | 0.3mg | 3mg |
| Form | Immediate-release tablet | Immediate-release capsule |
| Third-Party Tested | ✓ Yes | No |
| Proprietary Blend | No | No |
Why This Comparison Matters
This comparison highlights a critical issue in melatonin supplementation: dose. Research increasingly suggests that lower melatonin doses (0.3-1mg) are more physiologically appropriate than the 3-10mg doses commonly sold. Life Extension offers a low-dose option aligned with this research. NOW Foods offers a standard 3mg dose.
The irony of melatonin is that more is not better. Higher doses can cause next-day grogginess, may reduce the body's own melatonin production over time, and do not improve sleep onset more than lower doses in most studies. The optimal dose for most people is likely 0.5-1mg.
We scored both products with attention to dose appropriateness as part of the evidence score.
Detailed Score Breakdown
Melatonin 300 mcg (0.3mg)
Life Extension
0.3mg matches the physiologically validated dose from Dollins et al. 1994 - raises blood melatonin to natural nighttime levels without supra-physiological excess
Third-party tested, GMP certified. Life Extension has a strong quality track record but does not hold USP or NSF Certified for Sport designation
$0.04-$0.06/day - outstanding value; 100-count bottle typically under $5
Single-ingredient, no proprietary blends, dose clearly stated in both mcg and mg which reduces consumer confusion
One of the only mainstream brands selling the physiologically appropriate dose. Most studies showing melatonin works used 0.3-1mg. Starting here is the right call before ever trying a 5mg or 10mg product.
Melatonin 3mg
NOW Foods
3mg is within the clinically effective range and is the upper end of doses where the evidence is consistently positive; higher doses are not meaningfully more effective for most people
GMP certified, NPA A-rated GMP facility. No independent third-party sport certification (NSF/USP), but NOW Foods has a strong industry reputation for manufacturing quality
$0.03-$0.05/day - one of the best values in the category; 180-count bottles frequently available under $8
Single melatonin ingredient with clearly stated dose, standard excipients listed, no proprietary blends
Solid choice at a reasonable dose. 3mg is arguably the highest dose most people need - if this is not working, the problem is likely not the dose.
How We Compared These Products
Every product in our database is scored on four equally-weighted categories: clinical evidence quality, third-party testing and purity verification, cost per clinically effective dose (not cost per pill), and label transparency. These scores combine into an overall letter grade from A+ through F.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.