Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) vs NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)
Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) (#2, best premium) vs NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) (#3): in our Magnesium Glycinate for Sleep scoring the Natural Factors, Stress-Relax…
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Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)
$20.97Check price at iHerbRead full review
NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)
$14.69Check price at iHerbRead full reviewTopsFive comparison scores
Side by side
| Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) | NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) | |
|---|---|---|
| Price | $20.97 | $14.69 |
| Magnesium Form | Magnesium bisglycinate | Albion magnesium bisglycinate |
| Elemental Magnesium | 200 mg per serving | 300 mg per serving |
| Serving Size | 1 scoop (4 g) | 1 level teaspoon (approximately 3 g) |
| Servings Per Container | 30 | About 76 |
| Added Sleep Ingredients | Melatonin 2.5 mg; L-theanine 50 mg; GABA 100 mg from 125 mg PharmaGABA | None; no melatonin or L-theanine |
| Third-Party Verification | ISURA Verified Clean and Non-GMO | No qualifying finished-product certification shown; Non-GMO Project Verified |
| Other Ingredients | Citric acid, organic tapioca maltodextrin, natural flavors, stevia leaf extract, rice hull concentrate, organic beetroot juice | Citric acid |
| Allergen/Diet Notes | Vegetarian/vegan; label states no dairy, wheat, gluten, soy, sesame, egg, fish, shellfish, animal products or tree nuts | Vegetarian/vegan and kosher; not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, tree nuts or sesame |
How they differ in real use
Built from our magnesium glycinate for sleep scoring, each product's published specifications, and verified owner feedback — not hands-on testing.
Both the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) and the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) made our Top 5 Magnesium Glycinate for Sleep, at #2 (best premium) and #3. ISURA verification and complete disclosure keep it ahead of the uncertified products on the heavily weighted testing and transparency criteria. It ranks below Thorne because ISURA is less widely recognized than NSF and its L-theanine dose is well below the cited trial dose. The form, research-aligned dose, minimal ingredient list and exceptional value are stronger than the remaining uncertified products. Its low Third-Party Testing score keeps it below the independently verified top two despite leading the lighter-weight criteria.
We score magnesium glycinate for sleep on Third-Party Testing (30%), Form & Bioavailability (25%), Dose vs Research (20%), Label Transparency (15%) and Value (10%). On that basis the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) totals 8.3 out of 10 and the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) 7.9. The widest gap is Third-Party Testing, where the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) scores 8 against 3 for the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) — independent certification or a published certificate of analysis. Dose vs Research also separates them: 10 for the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) versus 7 for the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g). The NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) claws back ground on Value.
On paper, the specifications that actually differ: Magnesium Form — Magnesium bisglycinate on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus Albion magnesium bisglycinate on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g); Elemental Magnesium — 200 mg per serving on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus 300 mg per serving on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g); Serving Size — 1 scoop (4 g) on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus 1 level teaspoon (approximately 3 g) on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g); Servings Per Container — 30 on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus About 76 on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g); Added Sleep Ingredients — Melatonin 2.5 mg; L-theanine 50 mg; GABA 100 mg from 125 mg PharmaGABA on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus None; no melatonin or L-theanine on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g); Third-Party Verification — ISURA Verified Clean and Non-GMO on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus No qualifying finished-product certification shown; Non-GMO Project Verified on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g).
Pricing as of August 5, 2026: $20.97 for the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) and $14.69 for the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g), a $6.28 difference in the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)'s favor. Owners praise the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) for ISURA Verified Clean provides independent verification beyond an in-house quality statement. and all four active ingredients are individually disclosed rather than hidden in a proprietary blend.; the most common complaint is its 50 mg L-theanine dose is one quarter of the 200 mg daily dose used in the cited randomized human trial. Owners praise the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) for the 300 mg elemental dose is close to the 250 mg magnesium-bisglycinate dose used in the cited sleep trial. and at about $0.06 per 100 mg of elemental magnesium, it has the list's lowest active-ingredient cost.; the most common complaint is no USP, NSF, Informed Sport or published product-specific certificate is shown for the finished product.
Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)
- ISURA Verified Clean provides independent verification beyond an in-house quality statement.
- All four active ingredients are individually disclosed rather than hidden in a proprietary blend.
- One scoop supplies the serving, and the label declares a vegan formula free from the listed common allergens.
- Its 50 mg L-theanine dose is one quarter of the 200 mg daily dose used in the cited randomized human trial.
- Every serving fixes melatonin at 2.5 mg, so magnesium cannot be adjusted independently from melatonin.
NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)
- The 300 mg elemental dose is close to the 250 mg magnesium-bisglycinate dose used in the cited sleep trial.
- At about $0.06 per 100 mg of elemental magnesium, it has the list's lowest active-ingredient cost.
- The panel lists only magnesium bisglycinate and citric acid, without a proprietary blend.
- No USP, NSF, Informed Sport or published product-specific certificate is shown for the finished product.
- The label requires one teaspoon to be diluted in at least 6 oz of water or juice, making it less convenient than tablets or capsules.
Which should you buy?
The Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) is the better fit for buyers intentionally seeking a fixed magnesium-and-melatonin combination and people who value independent ISURA verification — it is the higher-scoring pick here, chiefly for Third-Party Testing. The NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) is the better fit for buyers prioritizing elemental-magnesium value and people comfortable mixing an unsweetened powder, and the stronger choice if Dose vs Research and Value matter more to you than the overall score. If the $6.28 saving matters more than Third-Party Testing, the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) is the better value. The Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) is a poor fit for people avoiding melatonin; the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) is a poor fit for people wanting capsules or tablets.
Choose the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) if
- Buyers intentionally seeking a fixed magnesium-and-melatonin combination
- People who value independent ISURA verification
Skip it if
- People avoiding melatonin
- Buyers wanting a magnesium-only formula
Choose the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) if
- Buyers prioritizing elemental-magnesium value
- People comfortable mixing an unsweetened powder
Skip it if
- People wanting capsules or tablets
- Buyers requiring external finished-product certification
Common questions
Is the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) better than the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)?
In our Magnesium Glycinate for Sleep ranking the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) scores higher overall, 8.3 to 7.9, with the biggest advantage in Third-Party Testing. The NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g) is stronger on Dose vs Research and Value, so it is the better pick if those matter most to you.
How much more does the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) cost than the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)?
$6.28 more as of August 5, 2026: $20.97 for the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) against $14.69 for the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g). Prices move, so the merchant page shows the current figure. What the extra buys is mostly Third-Party Testing — 8 versus 3 in our scoring.
What is the main difference between the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) and the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g)?
The headline spec difference is Magnesium Form: Magnesium bisglycinate on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) versus Albion magnesium bisglycinate on the NOW Foods, Magnesium Bisglycinate Powder, 8 oz (227 g). In use, the gap that matters most is Third-Party Testing (8 vs 3 in our scoring): independent certification or a published certificate of analysis.