Momentous Magnesium Bisglycinate

1. Ingredients 25% of the rating 3 of 5

   One active, magnesium bisglycinate, but silica, magnesium stearate and microcrystalline cellulose are added, against the page’s “no unnecessary fillers”.

2. Independent testing 35% of the rating 4 of 5

   NSF lists the product and Momentous posts two lot certificates (231 and 244 mg magnesium, lead 0.010 and 0.040 µg a day, run by Light Labs, a lab Momentous pays), but they are the maker’s own and no independent test exists.

3. Evidence 15% of the rating 3 of 5

   The glycinate form and 200 mg dose fit our guide, but its sleep evidence is one small trial and the page’s cramp and stress claims are not supported.

4. Trust 10% of the rating 3 of 5

   Two 2021 Prop 65 lead notices named Momentous protein powders (withdrawn), and its best-known advisor, Dr. Andrew Huberman, is paid by the brand (he discloses it).

5. Value 15% of the rating 4 of 5

   $16.99 for 30 servings is $0.57 for 200 mg, the lowest per dose of the tested magnesium products on this list.

The rating, 3.5 of 5, is the weighted average of these scores. See how we rank vitamins & minerals and our standard.

• Target (opens in a new tab) approx. $13 on sale 2026-11-03 (regularly approx. $17). Titled 30ct; the page says 30 servings of 2 capsules, which matches Momentous’s 60-capsule bottle. Sold by Target (the page names no other seller). In stock on 2026-11-03, with the sale price marked as ending that day.
• Amazon (opens in a new tab) approx. $17. The 60-capsule bottle (30 servings of 2 capsules), sold by Momentous US (the brand’s name) and shipped by Amazon. Seen 2026-11-03.

Prices as we saw them on October 23, 2026. They change often. These links carry no tracking code and earn us nothing.

1. Magnesium (as magnesium bisglycinate) 200 mg per two capsules
2. Hypromellose (capsule)
3. Silica
4. Magnesium stearate
5. Microcrystalline cellulose

• Paid certification NSF Certified for Sport

  Lists “Magnesium Bisglycinate”, Momentous: capsule, 60 count, serving size 2 capsules, lot field “All”. Momentous pays for the program. NSF says it verifies label contents, heavy metals and microbes, and 290 banned substances. It publishes no results. Open ↗ (opens in a new tab)

• Maker’s own test Momentous (lot certificate it publishes; heavy metals run by Light Labs, a lab Momentous pays) April 2026

  Lot 0136D6: magnesium 231.1 mg per two capsules against 200 mg claimed; arsenic 0.002, lead 0.010, cadmium and mercury under 0.001 µg a day; gluten under 20 ppm; no Salmonella, E. coli or Staph. aureus. Open ↗ (opens in a new tab)

• Maker’s own test Momentous (second lot certificate it publishes; heavy metals run by Light Labs, a lab Momentous pays) April 2026

  Lot 0136D6A: magnesium 243.9 mg per two capsules against 200 mg claimed; lead 0.040, cadmium 0.001, arsenic and mercury under 0.001 µg a day; gluten under 20 ppm; no Salmonella, E. coli or Staph. aureus. Open ↗ (opens in a new tab)

Is Momentous an influencer-sponsored brand?

In part. Huberman Lab’s own disclosure page (opens in a new tab) says Dr. Huberman is a scientific advisor to Momentous and is paid for it, and a Humble Growth stake was announced in 2024 (opens in a new tab). We rely on the certifier listing and lot data, not the endorsements.

Has Momentous had lead problems?

Two April 2021 Prop 65 notices (2021-00833 (opens in a new tab), 2021-00911 (opens in a new tab)) alleged lead in Momentous protein powders and were withdrawn that September. Neither named a vitamin or mineral. The two lot certificates show lead at 0.010 and 0.040 µg a day, against the 0.5 µg Prop 65 level.

Does magnesium bisglycinate really help sleep, stress or cramps?

A little, for some people. Our sleep and stress guide rests on one 46-person trial in older adults that used 500 mg. A Cochrane review of 11 trials (opens in a new tab) found magnesium unlikely to reduce cramps in older adults. We rate the page’s claims as stronger than the research.

Does it really contain no unnecessary fillers?

The label lists microcrystalline cellulose, silica and magnesium stearate. They are common flow agents, but they are fillers, so we scored the ingredients down.

• NSF’s Certified for Sport database lists “Magnesium Bisglycinate” from Momentous: capsule, 60 count, serving size 2 capsules. The listing shows its lot field as “All”.
• Momentous posts certificates of analysis. We opened both: lot 0136D6 (made 27 April 2026) measured 231.1 mg of magnesium per two capsules against 200 mg on the label, with arsenic 0.002, lead 0.010 and cadmium and mercury under 0.001 µg a day; lot 0136D6A (made 28 April 2026) measured 243.9 mg, with lead 0.040, cadmium 0.001 and arsenic and mercury under 0.001 µg a day. Both show gluten under 20 ppm and no Salmonella, E. coli or Staph. aureus.
• The form is magnesium bisglycinate, which our guide to the types of magnesium describes as well absorbed and the gentlest on the stomach. The label gives the elemental amount: 100 mg per capsule, 200 mg per serving.
• At $16.99 for 30 servings it costs about $0.57 a serving. That is roughly two thirds of the per-serving price of our Thorne magnesium bisglycinate powder ($0.87, same 200 mg).

• The page says “free of unnecessary fillers”, but the label lists microcrystalline cellulose, silica and magnesium stearate next to the hypromellose capsule. They are common flow agents, not a safety concern.
• Two capsules a serving means a 60-capsule bottle lasts 30 days, and 200 mg is more than half of the 350 mg upper limit for supplemental magnesium. Count magnesium from other supplements, and ask a clinician first if you have kidney disease or take medicines that interact with it.
• The two certificates show 115% and 122% of the label amount, and the specification allows up to 150%. That is a normal margin for a mineral, but a serving can hold more than 200 mg.
• Momentous’s certificate page lists only two batches for this product so far (0136D6 and 0136D6A). Check that the lot on your bottle appears on that page.
• The page promises better sleep, less muscle tension and cramps, and “reduced stress reactivity”. Our sleep and stress guide finds modest evidence, and a Cochrane review (opens in a new tab) found magnesium unlikely to prevent cramps in older adults.

Third-party tested

Yes

Tested by

NSF (Certified for Sport)

Label accuracy

Momentous’s certificates for two lots show 231.1 and 243.9 mg against 200 mg on the label

Certificate of analysis

Yes

1. Momentous Magnesium Bisglycinate product page. Maker’s page. Price ($16.99, or about $12.74 on a subscription), ingredients and claims as seen 2026-10-23. Open ↗ (opens in a new tab)
2. Target: Momentous Magnesium Bisglycinate capsules, 30ct. Independent source. A store listing: 200 mg of magnesium as magnesium bisglycinate per 2-capsule serving; other ingredients hypromellose, silica, magnesium stearate and microcrystalline cellulose. $16.99 and in stock on 2026-10-23. Open ↗ (opens in a new tab)
3. NSF Certified for Sport listing: Momentous Magnesium Bisglycinate. Certifier or regulator listing. NSF also lists Momentous Magnesium Malate and Magnesium Threonate as separate products. Open ↗ (opens in a new tab)
4. NSF Certified for Sport: what the mark means. Certifier or regulator listing. NSF’s description of what it verifies: 290 banned substances, label contents, no unsafe contaminants, GMP audits. Open ↗ (opens in a new tab)
5. Momentous certificate of analysis, magnesium bisglycinate 200 mg, lot 0136D6. Maker’s page. Published by Momentous. Magnesium, heavy-metal, gluten and microbial results; names Light Labs for the heavy metals. Open ↗ (opens in a new tab)
6. Momentous certificate of analysis, magnesium bisglycinate 200 mg, lot 0136D6A. Maker’s page. Published by Momentous. A second lot, made 28 April 2026: 243.9 mg magnesium, lead 0.040 µg a day; names Light Labs for the heavy metals. Open ↗ (opens in a new tab)
7. California Code of Regulations, Title 27, section 25805: Prop 65 maximum allowable dose levels. Independent source. Lists lead at 0.5 micrograms a day (the level behind our Prop 65 comparisons) and cadmium at 4.1 micrograms a day by mouth. Open ↗ (opens in a new tab)
8. Light Labs (home page). Independent source. A testing company that sells to brands; its home page lists Momentous among its customers. Open ↗ (opens in a new tab)
9. Magnesium for skeletal muscle cramps (Cochrane review, 2020). Independent source. 11 trials, 735 people. In older adults with idiopathic cramps, magnesium made little or no difference. Open ↗ (opens in a new tab)
10. Huberman Lab: disclaimer and disclosures. Independent source. States that Dr. Huberman is a scientific advisor to Momentous (among others) and receives financial compensation. Open ↗ (opens in a new tab)
11. Momentous announces strategic partnership with Humble Growth (press release, 29 February 2024). Independent source. Says Humble Growth acquired a significant minority stake. Open ↗ (opens in a new tab)
12. California Attorney General Prop 65 notice 2021-00833 (Momentous). Certifier or regulator listing. Protein powders only; withdrawn 2021-09-13. Open ↗ (opens in a new tab)
13. California Attorney General Prop 65 notice 2021-00911 (Momentous). Certifier or regulator listing. Protein powders only; withdrawn 2021-09-13. Open ↗ (opens in a new tab)

• Thorne Magnesium Bisglycinate (powder) NSF listing but no public batch certificate; about $52 for 60 servings of 200 mg. Citric acid and monk fruit sweeten it.
• Food first Magnesium also comes from food. See why it matters and where to get it.

• Types of Magnesium Article Glycinate vs citrate vs oxide vs threonate — which forms work best for what
• Why Magnesium Matters Article Role in 300+ enzymatic reactions and the scope of widespread deficiency
• Sleep and Stress Article Effects on sleep quality, anxiety, and muscle relaxation
• How to Tell if a Supplement Is Pure and Accurate Article What audits found in supplement bottles, which products are riskiest, and what third-party seals, lab certificates and FDA tools can and cannot tell you.