Updated Nov 10, 2026 · 8 products · one scoring framework
Some labels spotlight the weight of the magnesium glycinate compound. Others tell you the elemental magnesium you actually get. We compared eight products on that number, cost per 100 mg, and the testing documents you can check for yourself. This is a research review of public and brand-supplied information; we have not lab tested these products.
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Labeled serving size, from each product's Supplement Facts.
350 mg adult supplemental upper limit (NIH)
Three labels allow more than one serving a day: NOW Foods and Doctor's Best (up to 400 mg) and Pure Encapsulations (up to 480 mg). All three exceed the 350 mg upper limit at their maximum.
Order reflects our provisional editorial ranking. Cost per 100 mg = one-time price ÷ total elemental mg in the container × 100. Download the full dataset (or CSV). See how we score supplement quality.
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Scroll sideways to see every column.
| # | Product | Form | Elemental Mg | Price | Per 100 mg | Evidence tier | Watch for | Merchant link |
|---|---|---|---|---|---|---|---|---|
| 01 | Nootropics DepotMagnesium Glycinate Capsules, 180 capsules | Magnesium bisglycinate chelate monohydrate | 200 mg2 capsules | $27.99nootropicsdepot.com | $0.16 | T1Publicly verifiable | None | Check price for Nootropics Depot |
| 02 | MomentousMagnesium Bisglycinate, 60 capsules | Magnesium bisglycinate | 200 mg2 capsules | $16.99livemomentous.com | $0.28 | T1Publicly verifiable | Backordered | Check price for Momentous |
| 03 | EO VITAMagnesium Glycinate Capsules, 90 capsules | Magnesium glycinate | 275 mg3 capsules | $25.00eovita.io | $0.30 | T2Privately verified | None | Check price for EO VITA |
| 04 | ThorneMagnesium Bisglycinate Powder, 60 scoops (187 g) | Magnesium bisglycinate (TRAACS) | 200 mg1 scoop | $52.00thorne.com | $0.43 | T1Publicly verifiable | None | Check price for Thorne |
| 05 | Transparent LabsMagnesium Bisglycinate, 90 capsules | Magnesium bisglycinate chelate | 300 mg3 capsules | $16.99transparentlabs.com | $0.19 | T1Publicly verifiable | Sold out | Check price for Transparent Labs |
| 06 | Pure EncapsulationsMagnesium (Glycinate), 180 capsules | Magnesium glycinate | 120 mg1 capsule | $44.60Vitacost | $0.21 | T3Manufacturer level | Up to 480 mg/day | Check price for Pure Encapsulations |
| 07 | NOW FoodsMagnesium Glycinate Tablets, 180 tablets | Magnesium bisglycinate (Albion) | 200 mg2 tablets | $19.59Vitacost | $0.11 | T3Manufacturer level | Up to 400 mg/day | Check price for NOW Foods |
| 08 | Doctor's BestHigh Absorption Magnesium, 120 tablets | Magnesium lysinate glycinate chelate (Albion TRAACS) | 200 mg2 tablets | $13.99Vitacost | $0.12 | T3Manufacturer level | Mixed chelate | Check price for Doctor's Best |
Labels, prices and certifications change. A certification for Thorne's powder does not automatically apply to every Thorne magnesium product. Prices for Pure Encapsulations, NOW Foods and Doctor's Best are from Vitacost because the brands' sites did not show a usable one-time price. Evidence tiers: T1 publicly verifiable, T2 privately verified by our editors, T3 manufacturer-level information only. Tier definitions.
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Key strength. Public, lot-specific certificates of analysis; 200 mg in two capsules; about $0.16 per 100 mg.
Important limitation. Read each report for analytes, methods and the issuing lab. A PDF alone does not prove every quality attribute.
Key strength. NSF Certified for Sport, confirmed in NSF's directory; clear 200 mg elemental label; 30 servings.
Important limitation. Certification covers contents and banned substances, not better sleep. The one-time purchase showed as backordered.
Key strength. States 275 mg elemental from 2,500 mg compound; four-ingredient capsule; lot report verified by our editors.
Important limitation. The report isn't public yet, so readers can't check it themselves. Three capsules per serving.
Key strength. NSF Certified for Sport on this powder; 200 mg per scoop; 60 servings; short ingredient list.
Important limitation. Highest cost per 100 mg in this group, and a flavored powder rather than a neutral capsule.
Key strength. 300 mg per serving; purity and ingredient reports linked from the product page.
Important limitation. 300 mg sits close to the 350 mg supplemental upper limit before other sources. Sold out on our check date.
Key strength. 120 mg per capsule makes small, adjustable doses easy; two-ingredient capsule.
Important limitation. No third-party testing named on the brand page. The label allows up to four capsules (480 mg) a day.
Key strength. Lowest cost per 100 mg we found; Albion bisglycinate; widely sold.
Important limitation. Directions allow two tablets twice daily, or 400 mg, above the 350 mg upper limit. Large tablets.
Key strength. Albion TRAACS chelate with a clearly named form; inexpensive.
Important limitation. A lysinate glycinate blend, not glycinate alone. Directions of two tablets twice daily reach 400 mg.
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A label reading 2,500 mg magnesium glycinate does not mean 2,500 mg of magnesium. Look for the elemental figure.
Bisglycinate and glycinate usually mean magnesium bound to glycine. Some products use a lysinate glycinate blend or add oxide.
A certification tied to the product, or a lot report with methods, outweighs the phrase lab tested.
Price per 100 mg = bottle price ÷ total elemental mg × 100. Compare per serving too.
New to this? Start with what magnesium glycinate is, or see how glycinate compares with citrate. Worked example: $19.59 ÷ (200 mg × 90 servings) × 100 = $0.11 per 100 mg for NOW Foods.
Magnesium is essential for muscle and nerve function, energy metabolism and bone health. Those roles don't mean a supplement treats insomnia or prevents cramps. A 2026 systematic review of 12 randomized sleep trials found inconsistent benefits and low to very low certainty evidence (Lopresti, 2026). A 2025 placebo-controlled trial of 250 mg magnesium as bisglycinate found a small improvement in insomnia scores after four weeks (Schuster, 2025), but one trial doesn't override the broader review.
The NIH Office of Dietary Supplements sets the adult upper limit for supplemental magnesium at 350 mg a day, separate from food (NIH ODS). Too much can cause diarrhea, and kidney disease and some medications need a clinician's input. This site is educational and does not replace individual medical advice.
Read the evidence for magnesium and sleep and magnesium for muscle recovery.
Labels often use the two words for the same thing: magnesium bound to glycine. Read the exact ingredient, because some products use a mixed chelate or add magnesium oxide.
No brand has been shown to work better for insomnia in head-to-head trials. Choose on testing, dose and tolerability, and talk to a clinician about persistent insomnia.
It depends on your diet, other supplements and health. The adult upper limit for supplemental magnesium is 350 mg a day, so count every source. More is not automatically better.
Check the current Supplement Facts, look for product-specific certification or lot reports, compare cost per 100 mg of elemental magnesium, and read enough reviews to spot repeat problems.
It is the one-time bottle price divided by the total elemental magnesium in the bottle, times 100. It lets you compare a 120 mg capsule with a 300 mg serving fairly.
Most healthy adults tolerate it well at or below 350 mg of supplemental magnesium a day. Too much can cause diarrhea. People with kidney disease or on certain medications should ask a clinician first.
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