~ means approximate; — means no published value in this record. Customer ratings are the named publisher’s snapshot and may include multiple sizes or earlier formulas. The Supplement Explained Score is our source-reviewed editorial assessment out of 25, separate from customer stars. Compare the five criteria and the same intended use; the total is not a clinical ranking. Prices are dated USD offer snapshots; cost uses the reviewed pack and label serving.
Label clarity: 5/5
Evidence transfer: 4/5
Safety fit: 4/5
Quality proof: 4/5
Value fit: 3/5
Thorne Magnesium Bisglycinate is a lightly sweetened powder with 200 mg elemental magnesium per scoop. Its specific powder listings in the NSF Certified for Sport directory are a reason to investigate it when sport certification matters. Check the tub size, scoop instructions and lot: the 187 g and 226.2 g records are separate, and neither should be assumed to cover a different capsule product.
Magnesium can interact with medicines and may be unsafe with impaired kidney function. Check your full supplement and medicine list with a clinician or pharmacist before adding it.
The manufacturer declares 200 mg elemental magnesium per scoop and 60 servings. The grams of powder are not grams of elemental magnesium. The powder includes the magnesium compound and other ingredients. [1]
Use the scoop and serving instructions supplied with your own tub. A 3.11 g scoop from the 187 g record is not automatically the right measuring instruction for the 226.2 g pack. Do not compare this powder’s serving with a similarly named capsule by product name alone.
Is this exact powder NSF Certified for Sport?
Yes, NSF lists Magnesium Bisglycinate powder in both 187 g and 226.2 g records. The records identify powder, serving weight and listed lots. They are more precise than a statement that the entire brand is certified. [2][3]
Confirm the package weight and product name on the seller’s bottle.
Open the matching NSF entry, not just any Thorne listing.
Check the bottle’s lot against the listed lot information. If you cannot match it, ask the seller or certification provider.
We have not examined a purchased tub or matched its physical lot. Do not transfer this powder listing to capsules or travel packs without checking their own exact record. Certification also does not prove that magnesium is needed or that the powder works better for sleep than a less expensive product.
Does it contain monk fruit, and is it easy to drink?
It contains monk fruit concentrate and citric acid. That makes it an added-sweetener formula, not a plain magnesium-only powder. Whether that is helpful or undesirable depends on your taste and ingredient preferences. [1]
The practical advantage is avoiding a tablet or capsule. The trade-off is measuring and mixing a drink. We have not tasted or mixed it, so we cannot promise a pleasant taste, no residue or a particular texture. For a format decision rather than a brand decision, see magnesium powder vs capsules.
How much does a serving cost?
The manufacturer lists $52 for 60 scoops, one-time purchase, checked October 7, 2026. That is approximately $0.87 per 200 mg serving or $0.433 per 100 mg elemental magnesium. It is not the current price of the linked 187 g iHerb offer. [1]
No matched fresh USD serving-cost benchmark was available for the score review. The reviewed Magnesium Bisglycinate · reviewed 187 g powder supplies 60 label servings of Elemental magnesium 200 mg, using 1 scoop (3.11 g for 187 g pack) per serving. Sixty servings of the reviewed 187 g powder are identifiable; pack differences prevent a matched fresh USD serving-cost claim.
Tax, shipping, coupons and subscription pricing are excluded. The normalized amount compares labels; it is not a suggested dose or a claim about absorption.
The sport listing may justify checking this option when you specifically need that program. If it is not a requirement, compare cost, the sweetener and the format rather than assuming a higher price buys better clinical results.
What if you want no added sweetener or a tablet?
Our three-powder comparison includes Solaray’s citric-acid formula and Doctor’s Best lysinate glycinate powder with no other ingredients listed. They differ in scoop weight, declared magnesium, price and certification evidence.
Solaray’s powder supplies 350 mg in a rounded scoop, not Thorne’s 200 mg. Neither its formula nor its testing evidence should be treated as interchangeable with Thorne’s.
What should you check before taking it?
The US adult upper limit is 350 mg per day from supplements and medicines, excluding naturally occurring food magnesium, unless a healthcare professional directs otherwise. One 200 mg scoop contributes to that supplemental total; other products can add more. Diarrhea, nausea and cramping remain possible. [4]
Ask about medication spacing, kidney disease, pregnancy or breastfeeding rather than using a product review as an individual dosing plan. Our magnesium interaction guide covers medicine-specific questions, and the magnesium guide explains forms and evidence.
FAQ
Is 200 mg the magnesium amount or the total powder weight?
It is elemental magnesium. Total scoop weight includes the magnesium compound and other ingredients; it is not the same measurement.
Are the 187 g and 226.2 g tubs the same certification record?
No. NSF lists them separately, with different serving weights: 3.11 g and 3.77 g respectively. Match the tub and lot to the appropriate record.
Does Thorne Magnesium Bisglycinate powder contain a sweetener?
Yes. Its manufacturer ingredient list includes monk fruit concentrate, along with citric acid.
Does the powder’s NSF listing also certify Thorne magnesium capsules?
Not automatically. A different format needs its own exact-product certification check; a powder record is not brand-wide coverage.
Updated October 7, 2026: checked both NSF powder records, the ingredient list and manufacturer price. Label-based analysis; no hands-on test. Editorial policy.
Five equally weighted criteria, with a product-specific reason for every point. This is a buying-decision assessment, separate from customer stars and personal medical suitability.
Label clarity 5/5
Reviewed Magnesium Bisglycinate · reviewed 187 g powder: 1 scoop (3.11 g for 187 g pack); 60 label servings. Elemental magnesium 200 mg.
Evidence transfer 4/5
A 200 mg elemental serving helps compare magnesium intake; NSF sport testing does not establish a clinical sleep benefit.
Safety fit 4/5
Kidney impairment, medicine spacing and GI tolerance remain relevant; citric acid/monk fruit affect preference.
Quality proof 4/5
The reviewed 187 g powder has an NSF Certified for Sport record with specified lots; 226.2 g uses a separate scoop record.
Value fit 3/5
Sixty servings of the reviewed 187 g powder are identifiable; pack differences prevent a matched fresh USD serving-cost claim.
Review basis: Published labels, manufacturer/retailer information, clinical sources and exact-product quality records where available. We did not buy, personally use or laboratory-test this product for this assessment.
Product labels and independent directory records identify a formula or testing scope. Clinical references concern ingredients or studied regimens unless the explanation explicitly matches the finished formula.
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