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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

Klean Magnesium

90 vegetarian capsules (SKU KA202599-90), 120 mg magnesium as magnesium glycinate per capsule

$26.50US price, checked Oct 24, 2026

120 mg magnesium glycinate capsule that NSF's Certified for Sport database lists

Check price at Klean Athlete Full review →

Criterion	BulkSupplements.com Magnesium Glycinate Powder	Klean Magnesium
US price	$25.97Checked Oct 23, 2026 · Price details in the review	$26.50Checked Oct 24, 2026 · Price details in the review
Three-year ownership estimate	$151.25 Planning total.	$348.91 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 120 mg magnesium glycinate capsule that NSF's Certified for Sport database lists, with lot numbers you can check.
Main trade-off	The label declares glycinate plus oxide, not glycinate alone, and opened bags get only a partial refund.	Klean's directions allow up to 480 mg a day, above NIH's 350 mg upper limit for supplemental magnesium.
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: 120 mg magnesium as magnesium glycinate per capsule (29% of the Daily Value). Klean's directions are 1 capsule, 1 to 4 times daily Servings per container: 90 capsules at 1 capsule a serving, on Klean's label and in NSF's listings Price per serving: About $0.29 a capsule at the $26.50 retail price, or about $1.18 a day at 4 capsules Dose vs. upper limit: One capsule is 120 mg, under the 350 mg adult upper limit for magnesium from supplements and medications. Three capsules reach 360 mg, and the four Klean's directions allow reach 480 mg Other ingredients: Hydroxypropyl methylcellulose (vegetarian capsule) and ascorbyl palmitate. The label has no allergen statement Certification: NSF Certified for Sport lists two US entries for the 90-capsule product, with 11 and 13 certified lots Free-of statements: Klean's page shows gluten free, GMO free, vegan and vegetarian icons. NSF's entries list gluten free, GMO free and vegan claims Warning: Klean's label says to consult a health professional first if you're pregnant or lactating, have a health condition or take medication Where to buy: Klean's page lists a retail price but asks for a login to add to cart. Its shop address forwarded to a Klean Athlete storefront on Amazon on Oct 24, 2026
Exact variant	500 g bag (SKU MAGGLY500), about 227 servings, 300 mg magnesium per 3/4 tsp (about 2.2 g)	90 vegetarian capsules (SKU KA202599-90), 120 mg magnesium as magnesium glycinate per capsule
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.	Not stated by the manufacturer. Klean's page gives 90 vegetarian capsules per container, but no bottle size, net weight or capsule size. NSF's listings give a package size of 90 and a serving size of 1 capsule.
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. Klean's label says adults take 1 capsule, 1 to 4 times daily, or as a trainer, coach or health professional directs. The label doesn't mention food, but Klean's 2020 data sheet says to take it with a meal. The label says to use it only if the safety seal is intact and to store it in a cool, dry place.
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.	Each capsule holds 120 mg of magnesium as magnesium glycinate, which the label lists as 29% of the Daily Value. The other ingredients are hydroxypropyl methylcellulose (the vegetarian capsule) and ascorbyl palmitate. Klean's page shows gluten free, GMO free, vegan and vegetarian icons. The label has no allergen statement. Klean doesn't name the magnesium's source or say what the bottle is made of. The label says it's manufactured for Klean Athlete, Pittsburgh, Pennsylvania.
Warranty	Not stated by the manufacturer. BulkSupplements' refund and shipping policies describe returns and damaged items but no product warranty.	Klean gives no warranty term, per its return policy. The policy says Klean guarantees quality, purity and potency through the expiration date.
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.	30 days from receipt, with preauthorization and a 15% processing fee plus shipping. Klean's return policy says claims of shortage or damage must be made within 7 days of receiving the package. Authorized returns must reach Klean within 14 days of authorization. Returns are credited on receipt, less the 15% fee and the cost of shipping. The policy doesn't say whether an opened bottle qualifies.
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	Which NSF entry a given bottle's lot number sits in, and the certification date, which neither entry shows Whether the page's retail price applies to every buyer, since it asks you to log in Whether an opened bottle qualifies for return Who makes the magnesium glycinate and where it comes from Klean's bottle size and net weight Whether Klean's current directions call for a meal, since only its 2020 data sheet says so Whether the page's description means 120 mg of magnesium or of the glycinate compound, since the label panel says magnesium

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.