Our verdict
Momentous sells a straightforward bisglycinate capsule: 200 mg of elemental magnesium in two capsules, 30 servings per bottle. Its decisive feature is NSF Certified for Sport, which we confirmed in NSF's public directory for this product. That certification screens for banned substances and checks label claims, which matters most to drug-tested athletes. At $16.99 one-time it costs about $0.28 per 100 mg. The one-time purchase showed as backordered when we checked.
Best for: Drug-tested athletes and anyone who wants an independently certified product.
Check Momentous's current price, shipping and return terms on the seller's site. Status on our check date: one-time purchase backordered.
We may earn a commission from qualifying purchases. Our rating method is independent of compensation.
Dose, formula and the elemental magnesium calculation
The label lists 200 mg of elemental magnesium as magnesium bisglycinate per two-capsule serving, 48% of the Daily Value, with 30 servings in a 60-capsule bottle. Other ingredients are a hypromellose capsule, silica, magnesium stearate and microcrystalline cellulose.
The compound weight is not listed separately, which is fine: the elemental figure is the one to compare.
Testing and manufacturing: what has actually been verified?
Momentous Magnesium Bisglycinate is listed in the NSF Certified for Sport directory (opens in a new tab) as a 60-capsule, two-capsule-serving product, covering all lots. NSF Certified for Sport includes facility audits, label-claim testing and screening for substances banned in sport.
That places it on tier 1 of our evidence ladder. Keep the scope in mind: certification is about what is in the bottle, not whether the product improves sleep or recovery.
Evidence tiers: tier 1 is publicly verifiable, product-specific evidence; tier 2 is product-specific evidence our editors verified privately; tier 3 is manufacturer-level information without finished-product results; tier 4 is unverified. Full definitions.
Price and value: the fair way to compare
| Option | Price | Per serving | Per 100 mg |
|---|---|---|---|
| One-time, 60 capsules | $16.99 | $0.57 | $0.28 |
The subscribe-and-save price was $12.74 (25% off). We compare one-time prices across brands so subscriptions don't skew the table. We compare one-time prices on the same date across brands, never a sale price against another brand's list price. Cost per 100 mg is a comparison tool, not a dose recommendation.
Cost per 100 mg across all eight
We may earn a commission from qualifying purchases. Our rating method is independent of compensation.
Customer reviews, reputation and support
The product page showed 4.9 stars from 13 reviews when we checked. That is a small sample, so it gets limited weight.
We weigh verified-purchase feedback, sample size, review dates and repeated complaints such as tablet size, stomach upset or shipping delays. We don't treat self-reported sleep changes or a five-star average as clinical evidence.
Claims check
The bottle highlights deep, restorative sleep and full-body calm. Those are structure-function claims, not results from a trial of this product. The best human trial of bisglycinate found a modest change in insomnia scores; see the sleep evidence.
Who should consider it, and who might choose an alternative?
Pros
- NSF Certified for Sport, confirmed in NSF's directory
- Clear 200 mg elemental label
- About $0.28 per 100 mg one-time
- 25% off with a subscription
Cons
- One-time purchase backordered on our check date
- Small review sample (13)
- Certification does not prove sleep or recovery benefits
Alternatives worth comparing
Frequently asked questions
How much elemental magnesium does Momentous provide?
200 mg of elemental magnesium as magnesium bisglycinate per two-capsule serving.
Is Momentous magnesium third-party tested?
Yes. It is NSF Certified for Sport, and the listing appears in NSF's public directory.
Is Momentous magnesium good for sleep?
Certification shows what is in the bottle, not that it improves sleep. Human sleep evidence for magnesium is modest and inconsistent.
Is Momentous the best value?
At about $0.28 per 100 mg one-time, it is mid-pack. The subscription price lowers that to about $0.21.
How we reviewed Momentous
We reviewed the product page, Supplement Facts, price and any testing documents on November 10, 2026, and compared them with the published human research. We have not lab tested this product ourselves. Rankings follow how we score supplement quality, and the same criteria apply to every brand. Read our affiliate disclosure, magnesium glycinate versus other forms, magnesium glycinate sleep evidence and magnesium for muscle and exercise.
Sources
- livemomentous.com product page, checked Nov 10, 2026
- Momentous certification listing
- NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals.
- Lopresti AL, Smith SJ, Drummond PD. Magnesium Supplementation for Sleep in Adults: A Systematic Review of Randomized Controlled Trials. Journal of Dietary Supplements, 2026.
- Schuster J, Cycelskij I, Lopresti A, Hahn A. Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial. Nature and Science of Sleep, 2025.
Last source review: November 10, 2026. Next scheduled price check: December 2026. Spot an error? See our corrections policy.