Natural Factors, Stress-Relax Nighttime Magnesium Bisglycinate Powder with Melatonin, GABA & L-Theanine, Tropical Fruit, 4.23 oz (120 g) vs NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets
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 Glycinate, 100 mg, 180 Tablets (#5): 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 Glycinate, 100 mg, 180 Tablets
$19.59Check 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 Glycinate, 100 mg, 180 Tablets | |
|---|---|---|
| Price | $20.97 | $19.59 |
| Magnesium Form | Magnesium bisglycinate | Albion magnesium bisglycinate |
| Elemental Magnesium | 200 mg per serving | 200 mg per serving; 100 mg per tablet |
| Serving Size | 1 scoop (4 g) | 2 tablets |
| Servings Per Container | 30 | 90 |
| 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; manufacturer states in-house quality testing |
| Other Ingredients | Citric acid, organic tapioca maltodextrin, natural flavors, stevia leaf extract, rice hull concentrate, organic beetroot juice | Citric acid, hydroxypropyl cellulose, stearic acid, silicon dioxide and vegetarian coating with hypromellose, sunflower lecithin, triethyl citrate and sunflower oil |
| Allergen/Diet Notes | Vegetarian/vegan; label states no dairy, wheat, gluten, soy, sesame, egg, fish, shellfish, animal products or tree nuts | Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nuts or sesame; facility processes other allergen-containing ingredients |
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 Glycinate, 100 mg, 180 Tablets made our Top 5 Magnesium Glycinate for Sleep, at #2 (best premium) and #5. 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. It matches Doctor's Best on elemental dose and has similarly strong recent sales, but costs more per active amount and uses a longer excipient list. With no stronger third-party verification to offset those disadvantages, it ranks fifth.
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 Glycinate, 100 mg, 180 Tablets 7.1. 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 Glycinate, 100 mg, 180 Tablets — independent certification or a published certificate of analysis. Value also separates them: 9 for the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets versus 5 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 Glycinate, 100 mg, 180 Tablets claws back ground on Dose vs Research.
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 Glycinate, 100 mg, 180 Tablets; 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 200 mg per serving; 100 mg per tablet on the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets; 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 2 tablets on the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets; 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 90 on the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets; 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 Glycinate, 100 mg, 180 Tablets; 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; manufacturer states in-house quality testing on the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets.
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 $19.59 for the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets, a $1.38 difference in the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets'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 Glycinate, 100 mg, 180 Tablets for the panel explicitly identifies 200 mg elemental magnesium from 2,000 mg Albion magnesium bisglycinate. and the bottle supplies 90 servings at approximately $0.22 per serving.; 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 Glycinate, 100 mg, 180 Tablets
- The panel explicitly identifies 200 mg elemental magnesium from 2,000 mg Albion magnesium bisglycinate.
- The bottle supplies 90 servings at approximately $0.22 per serving.
- More than 40,000 reviews and 90,000-plus recent sales provide substantial buyer-volume evidence.
- No USP, NSF, Informed Sport or published product-specific certificate is shown for the finished product.
- A serving requires two tablets and includes citric acid, cellulose derivatives, stearic acid, silicon dioxide and a multi-ingredient coating.
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 and Label Transparency. The NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets is the better fit for buyers wanting a widely purchased pure-bisglycinate tablet and people who want magnesium without melatonin or L-theanine, and the stronger choice if Value and Dose vs Research matter more to you than the overall score. If the $1.38 saving matters more than Third-Party Testing, the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets 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 Glycinate, 100 mg, 180 Tablets is a poor fit for buyers requiring product-specific external certification.
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 Glycinate, 100 mg, 180 Tablets if
- Buyers wanting a widely purchased pure-bisglycinate tablet
- People who want magnesium without melatonin or L-theanine
Skip it if
- Buyers requiring product-specific external certification
- People preferring a one-capsule or one-tablet serving
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 Glycinate, 100 mg, 180 Tablets?
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 7.1, with the biggest advantage in Third-Party Testing. The NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets is stronger on Value and Dose vs Research, 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 Glycinate, 100 mg, 180 Tablets?
$1.38 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 $19.59 for the NOW Foods, Magnesium Glycinate, 100 mg, 180 Tablets. 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 Glycinate, 100 mg, 180 Tablets?
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 Glycinate, 100 mg, 180 Tablets. 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.