Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) vs Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)
Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) (#1, best overall) vs Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) (#2, best premium): in our Magnesium Glycinate for Sleep scoring the Thorne, Magnesium…
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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 reviewTopsFive comparison scores
Side by side
| Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) | Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) | |
|---|---|---|
| Price | $52 | $20.97 |
| Magnesium Form | Magnesium bisglycinate | Magnesium bisglycinate |
| Elemental Magnesium | 200 mg per serving | 200 mg per serving |
| Serving Size | 1 scoop (3.11 g) | 1 scoop (4 g) |
| Servings Per Container | 60 | 30 |
| Added Sleep Ingredients | None; no melatonin or L-theanine | Melatonin 2.5 mg; L-theanine 50 mg; GABA 100 mg from 125 mg PharmaGABA |
| Third-Party Verification | NSF Certified for Sport | ISURA Verified Clean and Non-GMO |
| Other Ingredients | Citric acid; monk fruit concentrate | Citric acid, organic tapioca maltodextrin, natural flavors, stevia leaf extract, rice hull concentrate, organic beetroot juice |
| Allergen/Diet Notes | Gluten-free | Vegetarian/vegan; label states no dairy, wheat, gluten, soy, sesame, egg, fish, shellfish, animal products or tree nuts |
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 Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) and the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) made our Top 5 Magnesium Glycinate for Sleep, at #1 (best overall) and #2 (best premium). Its NSF Certified for Sport listing gives it a decisive advantage on the highest-weighted criterion, while the pure bisglycinate form and transparent 200 mg elemental dose remain strong. The premium price prevents a higher Value score but does not outweigh its certification advantage. 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.
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 Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) totals 8.9 out of 10 and the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) 8.3. The widest gap is Third-Party Testing, where the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) scores 10 against 8 for the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) — independent certification or a published certificate of analysis. Dose vs Research also separates them: 8 for the Thorne, Magnesium Bisglycinate, 6.5 oz (187 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 Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) claws back ground on Label Transparency and Value.
On paper, the specifications that actually differ: Serving Size — 1 scoop (3.11 g) on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus 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); Servings Per Container — 60 on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus 30 on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g); Added Sleep Ingredients — None; no melatonin or L-theanine on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus 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); Third-Party Verification — NSF Certified for Sport on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus 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); Other Ingredients — Citric acid; monk fruit concentrate on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus Citric acid, organic tapioca maltodextrin, natural flavors, stevia leaf extract, rice hull concentrate, organic beetroot juice on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g); Allergen/Diet Notes — Gluten-free on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus Vegetarian/vegan; label states no dairy, wheat, gluten, soy, sesame, egg, fish, shellfish, animal products or tree nuts on the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g). They match on Magnesium Form and Elemental Magnesium.
Pricing as of August 5, 2026: $52 for the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) and $20.97 for the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g), a $31.03 difference in the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)'s favor. Owners praise the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) for the exact 187 g powder appears in the NSF Certified for Sport database. and the panel clearly states 200 mg of elemental magnesium as magnesium bisglycinate.; the most common complaint is at $0.87 per 200 mg serving, it has the highest cost per active ingredient in the list. 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.
Thorne, Magnesium Bisglycinate, 6.5 oz (187 g)
- The exact 187 g powder appears in the NSF Certified for Sport database.
- The panel clearly states 200 mg of elemental magnesium as magnesium bisglycinate.
- One scoop provides the complete serving without a multi-capsule or multi-tablet dose.
- At $0.87 per 200 mg serving, it has the highest cost per active ingredient in the list.
- Citric acid and monk fruit concentrate make it unsuitable for buyers wanting an unsweetened, single-ingredient powder.
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.
Which should you buy?
The Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) is the better fit for buyers prioritizing the strongest independent certification and people who prefer one mixed scoop instead of tablets or capsules — it is the higher-scoring pick here, chiefly for Third-Party Testing and Dose vs Research. 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, and the stronger choice if Label Transparency and Value matter more to you than the overall score. If the $31.03 saving matters more than Third-Party Testing, the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) is the better value. The Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) is a poor fit for budget-focused buyers; 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.
Choose the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) if
- Buyers prioritizing the strongest independent certification
- People who prefer one mixed scoop instead of tablets or capsules
Skip it if
- Budget-focused buyers
- People avoiding monk fruit or citric acid
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
Common questions
Is the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) better than the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)?
In our Magnesium Glycinate for Sleep ranking the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) scores higher overall, 8.9 to 8.3, with the biggest advantage in Third-Party Testing. The Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) is stronger on Label Transparency and Value, so it is the better pick if those matter most to you.
How much more does the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) cost than the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)?
$31.03 more as of August 5, 2026: $52 for the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) against $20.97 for the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g). Prices move, so the merchant page shows the current figure. What the extra buys is mostly Third-Party Testing — 10 versus 8 in our scoring.
What is the main difference between the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) and the Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g)?
The headline spec difference is Serving Size: 1 scoop (3.11 g) on the Thorne, Magnesium Bisglycinate, 6.5 oz (187 g) versus 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). In use, the gap that matters most is Third-Party Testing (10 vs 8 in our scoring): independent certification or a published certificate of analysis.