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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

Thorne Magnesium Bisglycinate

Powder, 60 scoops (SKU M204), 200 mg magnesium as magnesium bisglycinate per scoop, sweetened with monk fruit

$52US price, checked Oct 23, 2026

200 mg magnesium bisglycinate powder with an NSF Certified for Sport listing

Check price at Thorne Full review →

Criterion	BulkSupplements.com Magnesium Glycinate Powder	Thorne Magnesium Bisglycinate
US price	$25.97Checked Oct 23, 2026 · Price details in the review	$52Checked Oct 23, 2026 · Price details in the review
Three-year ownership estimate	$151.25 Planning total.	$1,000.99 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 magnesium drink powder with a short ingredient list and an NSF sport listing you can check by lot number.
Main trade-off	The label declares glycinate plus oxide, not glycinate alone, and opened bags get only a partial refund.	It costs about $0.87 a scoop, and approved returns carry a 25% restocking fee.
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 magnesium as magnesium bisglycinate (1 scoop). Thorne's page shows no % Daily Value Servings per container: 60 scoops Price per serving: About $0.87 at the $52 one-time list price Dose vs. upper limit: 200 mg per scoop, under the 350 mg adult upper limit for magnesium from supplements and medications Other ingredients: Citric acid, monk fruit concentrate. Labeled gluten free, dairy free and soy free Certification: NSF Certified for Sport. NSF lists it as an unflavored powder, 1 scoop (3.77 g) per serving, 7.98 oz (226.2 g) package, with 21 certified lots Directions: 1 scoop daily in at least 8 oz of water. For sleep, Thorne suggests 30 to 60 minutes before bed Side effects: Thorne says some people get gas, bloating or diarrhea, and that it resolves when the amount is reduced
Exact variant	500 g bag (SKU MAGGLY500), about 227 servings, 300 mg magnesium per 3/4 tsp (about 2.2 g)	Powder, 60 scoops (SKU M204), 200 mg magnesium as magnesium bisglycinate per scoop, sweetened with monk fruit
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. Thorne's page gives 60 one-scoop servings per tub, but no container size or net weight. NSF's listing gives a 3.77 g scoop and a package size of 7.98 oz (226.2 g). That matches 60 scoops, but NSF doesn't tie it to SKU M204.
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. Thorne's directions are to mix 1 scoop with at least 8 ounces of water daily, or as your health-care practitioner recommends. For sleep, Thorne suggests taking it 30 to 60 minutes before bed, with or without food.
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 scoop holds 200 mg of magnesium as magnesium bisglycinate. The other ingredients are citric acid and monk fruit concentrate. Thorne calls the powder lightly sweetened but doesn't name a flavor, and NSF lists it as unflavored. It's labeled gluten free, dairy free and soy free. Its badges also say "derived from natural flavors" and "derived from natural colors," though the ingredient list names neither. Thorne doesn't name the magnesium supplier or the tub material.
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. Neither the product page nor Thorne's returns FAQ mentions a warranty.
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.	Thorne's returns FAQ says you can request a return within 60 days of buying from Thorne. Its 60-Day Satisfaction Guarantee covers purchases from Thorne's website or authorized US sellers, for a refund or a product credit. All approved returns carry a 25% restocking fee. Thorne generally doesn't refund or exchange product past its expiration date. The page doesn't say who pays return shipping. For opened products, it only asks you to call Customer Service.
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: Thorne doesn't name a source Whether a given tub's lot number is among the 21 lots NSF lists Net weight and container size, which Thorne doesn't state What backs Thorne's claim that it's well absorbed, since the page cites no study Who pays return shipping

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.