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Magnesium

BulkSupplements.com Magnesium Glycinate Powder

500 g bag (SKU MAGGLY500), about 227 servings, 300 mg magnesium per 3/4 tsp (about 2.2 g)

$25.97US price, checked Oct 23, 2026

Low-cost magnesium powder, glycinate plus oxide, named in NSF's listing

Check price at BulkSupplements.com Full review →

Magnesium

Momentous Magnesium Bisglycinate

60 capsules (30 servings)

$16.99US price, checked Oct 23, 2026

200 mg magnesium bisglycinate in two capsules, with an NSF sport listing

Check price at Momentous Full review →

Criterion	BulkSupplements.com Magnesium Glycinate Powder	Momentous Magnesium Bisglycinate
US price	$25.97Checked Oct 23, 2026 · Price details in the review	$16.99Checked Oct 23, 2026 · Price details in the review
Three-year ownership estimate	$151.25 Planning total.	$637.12 Planning total.
Choose if	You want a low-cost magnesium powder with no other ingredients and a listing in NSF's own database.	You want a labeled 200 mg of magnesium bisglycinate in capsules, with an NSF sport listing, for under $17 a bottle.
Main trade-off	The label declares glycinate plus oxide, not glycinate alone, and opened bags get only a partial refund.	A bottle lasts only 30 days, and delivered bottles generally can't be returned.
Key specifications	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	Dose per serving: 200 mg elemental magnesium as magnesium bisglycinate (48% DV) per 2 capsules Servings per container: 30 (60 capsules at 2 per serving) Price per serving: About $0.57 at the $16.99 one-time price. On a subscription, about $0.42 for the first delivery ($12.74) and about $0.51 after that ($15.29) Certification: NSF Certified for Sport. NSF lists "Magnesium Bisglycinate" by Momentous as an unflavored capsule, 2 capsules per serving, package size 60, lot # "All" Other ingredients: Hypromellose, silica, magnesium stearate, microcrystalline cellulose. Labeled vegan, gluten free and GMO free Directions: 2 capsules 30 to 60 minutes before bed, or at another time of day, per Momentous Medication caution: Momentous says to check with your doctor first if you take diuretics, antibiotics or bisphosphonates
Exact variant	500 g bag (SKU MAGGLY500), about 227 servings, 300 mg magnesium per 3/4 tsp (about 2.2 g)	60 capsules (30 servings)
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.	Momentous doesn't state the bottle's dimensions. Momentous's online store lists a weight of 3.0 oz (85 g) for the 60-capsule bottle.
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.	No installation. Momentous's directions are 2 capsules 30 to 60 minutes before bed, or at another time of day.
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.	The magnesium is magnesium bisglycinate, which Momentous says is chelated to glycine, an amino acid. It doesn't name the supplier. The Supplement Facts image lists hypromellose, silica, magnesium stearate and microcrystalline cellulose as the other ingredients. The label is marked vegan, gluten free and GMO free, and NSF's listing carries the same free-of claims. Momentous doesn't state what the bottle is made of.
Warranty	Not stated by the manufacturer. BulkSupplements' refund and shipping policies describe returns and damaged items but no product warranty.	Not stated by the manufacturer. The product page shows a "30 day money back guarantee" with no terms, and the refund policy mentions none.
Returns	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.	Momentous's refund policy says it generally doesn't accept returns of delivered products, except where the law requires it. Original and return shipping costs aren't refundable either, with the same exception. The policy doesn't limit your rights under consumer protection laws, and it asks you to contact Momentous if there's a problem. It gives no return window. If you bought from a retailer, the policy says to contact that retailer.
Unresolved questions	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	Who supplies the magnesium bisglycinate: Momentous doesn't name a source Bottle dimensions and material Which magnesium form the insomnia analysis Momentous cites covered

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.