Best magnesium glycinate supplement
Momentous Magnesium Bisglycinate
200 mg magnesium bisglycinate in two capsules, with an NSF sport listing
$16.99
US price, checked
Magnesium
BulkSupplements.com Magnesium Glycinate Powder
Low-cost magnesium powder, glycinate plus oxide, named in NSF's listing
$25.97US price, checked
Check price at BulkSupplements.com for BulkSupplements.com Magnesium Glycinate Powder Our reviews rest on published sources, not hands-on testing. Our method
Porsche also cofounded Superhuman Chambers, which sells hyperbaric chambers · About the author. This is general information, not medical advice, and no clinician has reviewed it.
The verdict
BulkSupplements Magnesium Glycinate Powder gives 300 mg of magnesium per 2.2 g serving, and NSF's own dietary supplement listing names it. The 500 g bag is $25.97, about $0.11 a serving. The catch is the label: it declares magnesium glycinate and magnesium oxide, not glycinate alone.
The trade-off
The label declares glycinate plus oxide, not glycinate alone, and opened bags get only a partial refund.
At a glanceMagnesium
- Dose per serving
- 300 mg magnesium (70% Daily Value) as magnesium glycinate and magnesium oxide…
- Servings per container
- About 227 in the 500 g bag
- Price per serving
- About $0.11 at the $25.97 one-time price
- Form
- Powder, with two forms of magnesium declared and no split stated
Model reviewed: 500 g bag (SKU MAGGLY500), about 227 servings, 300 mg magnesium per 3/4 tsp (about 2.2 g)
$25.97
Check price at BulkSupplements.com US price, checked
No affiliate commission on this link. Check the exact variant before buying.
- Returns 30 days from the invoice date for a full refund on unopened items. See conditions
- Delivery Flat-rate shipping starts at $9.95, and orders over $59 ship free in the contiguous US.
About this price
This is the one-time price for the 500 g powder on BulkSupplements' US store, before tax and shipping: $25.97, about $0.11 a serving. The 100 g, 250 g and 1 kg powders list at $20.97, $22.97 and $34.97. A subscription price takes 10% off and isn't used here.
$50
Related comparisons: Thorne vs Momentous Magnesium Bisglycinate
A GOOD FIT FOR
You want a low-cost magnesium powder with no other ingredients and a listing in NSF's own database.
- A low-cost magnesium powder with no other ingredients, listed in NSF's own dietary supplement database
- A 300 mg dose for an adult not taking other magnesium, against NIH's 350 mg adult limit for supplemental magnesium
THINK TWICE IF
- If you want magnesium glycinate alone, the label declares glycinate and oxide
- If you already take another magnesium supplement or medicine, the 350 mg limit covers all of them combined and one serving is 300 mg
- If you're buying for a child or teen, NIH's upper limits run from 65 to 350 mg by age
- If you take oral bisphosphonates, tetracycline or quinolone antibiotics, or diuretics, ask a clinician first, since NIH lists interactions or effects on magnesium status
What still needs checking
- Whether a given bag's lot number is covered by NSF's listing, which shows no lot numbers
- The NSF certification date, which the listing doesn't show
- How much of the 300 mg comes from glycinate and how much from oxide
- Where the magnesium is made
Is BulkSupplements third party tested?
NSF’s own dietary supplement listing names BulkSupplements.com’s Magnesium Glycinate powder among 29 products from its Henderson, Nevada facility4. The listing shows no lot numbers or certification date4.
The product page’s own text doesn’t mention NSF or third-party testing1. The label shows 300 mg of magnesium per serving as glycinate and oxide3.
The practical details.
| Exact variant | 500 g bag (SKU MAGGLY500), about 227 servings, 300 mg magnesium per 3/4 tsp (about 2.2 g) |
|---|---|
| Dose per serving | 300 mg magnesium (70% Daily Value) as magnesium glycinate and magnesium oxide, in 3/4 tsp (about 2.2 g) |
| Servings per container | About 227 in the 500 g bag |
| Price per serving | About $0.11 at the $25.97 one-time price |
| Form | Powder, with two forms of magnesium declared and no split stated |
| Other ingredients | None, per the label. Free of added sugar, soy, dairy, yeast and gluten, per the page |
| Dose vs. upper limit | 300 mg per serving, under the 350 mg adult upper limit for supplemental magnesium and leaving 50 mg for any other supplement or medicine |
| Certification | NSF's dietary supplement listing (NSF/ANSI Standard 173) names Magnesium Glycinate powder with a 3/4 tsp (about 2.2 g) serving, made at a Henderson, Nevada facility |
| Directions | 3/4 tsp (about 2.2 g) in 8 to 12 oz of water, or as directed by your health care provider |
| Delivery | Flat-rate shipping starts at $9.95, and orders over $59 ship free in the contiguous US |
| Dimensions | Not stated by the manufacturer. The 500 g label gives a net weight of 500 g and about 227 servings, but no bag dimensions. |
| Materials | The only ingredient is magnesium, 300 mg a serving, declared as magnesium glycinate and magnesium oxide. The 500 g label says Other Ingredients: None and Allergens: None, and the page lists it as free of added sugar, soy, dairy, yeast and gluten and marks it vegan. BulkSupplements doesn't say how much of the 300 mg comes from each form, where the magnesium is made or what the bag is made of. |
Before you buy
InstallationNo installation
No installation. The label says to take 3/4 tsp (about 2.2 g) with 8 to 12 ounces of water, or as directed by your health care provider, and to store it in a dry, cool, dark place.
WarrantyNot stated by the manufacturer
Not stated by the manufacturer. BulkSupplements' refund and shipping policies describe returns and damaged items but no product warranty.
Returns30 days from the invoice date for a full refund on unopened items
30 days from the invoice date for a full refund on unopened items. Opened items returned within 30 days get a partial refund equal to the price of the smallest unit offered for that product. The policy's example is a 500 g bag, and the smallest powder size on this page is 100 g, at $20.97. BulkSupplements isn't responsible for return postage, and shipping charges and discount codes aren't refunded. Wholesale quantities are excluded from the opened-item refund, and customer service won't investigate disputes after the 30 days.
More about this assessment
BulkSupplements Magnesium Glycinate Powder gives 300 mg of magnesium per 2.2 g serving, declared on the label as magnesium glycinate and magnesium oxide. The 500 g bag lists at $25.97, about $0.11 a serving, or about $42 a year at one serving a day. NSF's own dietary supplement listing names the powder, with no lot numbers or certification date. Unopened items can be returned within 30 days for a full refund, but opened items get only a partial refund. FDA lists two recalls and a 2015 warning letter about other BulkSupplements.com products.
Strengths on paper
- 300 mg of magnesium per 2.2 g serving, with Other Ingredients: None
- NSF's own dietary supplement listing names the powder
- About $0.11 a serving, or about $42 a year, at the 500 g one-time price
- Unopened items can be returned within 30 days for a full refund
- Orders over $59 ship free in the contiguous US
Limitations
- The label declares magnesium glycinate and magnesium oxide, and NIH says oxide tends to be less bioavailable than the citrate, lactate, aspartate and chloride forms
- One serving is 300 mg, leaving 50 mg of room under the 350 mg adult limit for supplemental magnesium
- Opened bags get only a partial refund, and you pay return postage
- BulkSupplements says serving sizes on its site are subject to occasional adjustment
- FDA lists two voluntary recalls of other BulkSupplements.com products, in 2018 and 2025, and a 2015 warning letter on its caffeine powder that FDA closed out in 2016
- The page claims sleep, relaxation and bone benefits without citing a study
Running costs.
PLAN YOUR OWNERSHIP COSTS
What will it cost to own?
Change the assumptions to fit your use. Leave an unknown cost blank. Add water, subscriptions, cleaning, shipping and taxes if they apply. Use average operating power, not the maximum rating.
3-year planning total
$151.25Every field has a value. This is an estimate, not a quote.
Energy component: $0.00
Purchase + installation + years × (annual consumables + annual other) + watts/1000 × hours/day × 365 × years × $/kWh. Annualized allowances, not an exact replacement schedule. Excludes taxes, shipping, finance and resale unless entered.Replacement parts & cost assumptions
Recorded recurring parts and refills:
- Magnesium Glycinate Powder 500 g bag (MAGGLY500): $25.97 every 7.46 months. One bag lasts about 227 days (about 7.46 months) at the label dose of one serving a day. The cost is the $25.97 one-time price, before tax and shipping. The subscription price isn't included.
- Annual refills at the label dose of one serving a day: 365 servings / 227 per bag x $25.97 = $41.76 at the one-time price. That leaves out tax and shipping, and any subscription discount.
- The first $25.97 bag counts as the purchase, and refills cover three full years. So the three-year estimate includes about one bag more than 1,095 daily servings would need.
Evidence & sources.
Do creatine, fish oil, vitamin D and magnesium work? Our evidence review grades the research as Mixed. That grade is about the claim, not about this product.
- CertificationNSF's dietary supplement listing at info.nsf.org, titled NSF/ANSI Standard 173 Dietary Supplements and current as of Oct 20, 2026, names "MAGNESIUM GLYCINATE" as a powder with a serving of 3/4 tsp (about 2.2 g). It's one of 29 products NSF lists for Hard Eight Nutrition LLC, which sells as BulkSupplements.com, from a facility in Henderson, Nevada.4 The listing shows no lot numbers, package sizes, certification date or composition. It can't confirm the current glycinate-plus-oxide formula, and it names the powder only, not the capsules on the same page. A listing says what NSF checked in the product, not whether it has any health effect. The product page's text doesn't mention NSF or third-party testing.
- Manufacturer claimBulkSupplements says the powder is a gentle and bioavailable form of magnesium. The page lists benefits for restful sleep, relaxation and bone health and carries the standard notice that the FDA hasn't evaluated these statements. It cites no studies.1 These are BulkSupplements' marketing claims for a dietary supplement, and none is tied to a study on the page.
- Independent testNIH's Office of Dietary Supplements says a Supplement Facts panel declares elemental magnesium. It says the aspartate, citrate, lactate and chloride forms tend to have higher bioavailability than magnesium oxide and sulfate. It sets the upper limit for supplemental magnesium at 350 mg for adults, and 65 to 350 mg for children and adolescents depending on age. High doses from supplements or medications can cause diarrhea, nausea and abdominal cramping. NIH also lists interactions with oral bisphosphonates, tetracyclines and quinolone antibiotics.7 One serving's 300 mg is under the adult limit, with 50 mg to spare for any other supplement or medicine. The fact sheet doesn't discuss the glycinate form.
- Published studyA 2025 randomized, double-blind, placebo-controlled trial enrolled 155 adults aged 18 to 65 who reported poor sleep (Schuster and colleagues, Nature and Science of Sleep). They took 250 mg of elemental magnesium a day as magnesium bisglycinate, or a placebo. By week 4, Insomnia Severity Index scores fell 3.9 points with magnesium and 2.3 with placebo. The difference was small (Cohen's d 0.2) and only just significant (p = 0.049). Other psychological measures showed no significant difference.8 The trial tested magnesium bisglycinate, not a glycinate and oxide blend or this product. Sleep was self-reported, and the abstract gives a four-week comparison. One author directs a contract research organization that receives funding from nutraceutical companies.
- Regulator recordopenFDA's food enforcement reports list two voluntary, Class II recalls by Hard Eight Nutrition, which owns the BulkSupplements.com trademark. Both are marked terminated. One began Aug 6, 2018, over undeclared shellfish in glucosamine sulfate potassium. The other began Jun 25, 2025, over possible Staphylococcus aureus contamination of inositol powder. FDA's Aug 27, 2015 warning letter called the firm's caffeine powder adulterated. A Feb 5, 2016 letter says the firm appeared to have addressed the violations.191112 None of these involves magnesium.
Sources (12)
- Magnesium Glycinate Powder BulkSupplements.com · manufacturer · checked Oct 20, 2026
- Magnesium Glycinate Powder sizes and one-time prices BulkSupplements.com · manufacturer · price read from the store’s product data · checked Oct 23, 2026
- Magnesium Glycinate Powder 500 g label (Supplement Facts) BulkSupplements.com · manufacturer · checked Oct 20, 2026
- NSF/ANSI Standard 173 Dietary Supplements listing: Hard Eight Nutrition LLC dba BulkSupplements.com NSF · certifier · checked Oct 20, 2026
- Refund policy BulkSupplements.com · manufacturer · checked Oct 20, 2026
- Shipping policy BulkSupplements.com · manufacturer · checked Oct 20, 2026
- Magnesium: Fact Sheet for Health Professionals NIH Office of Dietary Supplements · independent test · checked Oct 20, 2026
- Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial (Nat Sci Sleep 2025, doi:10.2147/NSS.S524348) PubMed · study · checked Oct 20, 2026
- openFDA food enforcement reports, search for Hard Eight Nutrition U.S. Food and Drug Administration · regulator · data file · checked Oct 20, 2026
- Warning Letters, search for BulkSupplements U.S. Food and Drug Administration · regulator · checked Oct 20, 2026
- Hard Eight Nutrition LLC warning letter, Aug 27, 2015 (Internet Archive copy of FDA's page captured Apr 23, 2019) U.S. Food and Drug Administration · regulator · checked Oct 20, 2026
- Hard Eight Nutrition LLC close-out letter, Feb 5, 2016 (Internet Archive copy of FDA's page captured Apr 25, 2019) U.S. Food and Drug Administration · regulator · checked Oct 20, 2026
Other options.
Back to our third-party-tested supplements picks →Klean Athlete
Klean Magnesium
120 mg magnesium glycinate capsule that NSF's Certified for Sport database lists
$26.50
US price, checked
Thorne
Thorne Magnesium Bisglycinate
200 mg magnesium bisglycinate powder with an NSF Certified for Sport listing
$52
US price, checked
About this review. The facts on this page come from manufacturer pages, certification listings, regulator records, published studies and independent tests, checked between Oct 20 and Oct 23, 2026. The sources are listed above.
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