Third-Party Tested Magnesium Glycinate 2026: Certified
The cheapest third-party tested magnesium glycinate with a label check is Nature’s Truth, at $0.35 per 200 mg at list price, on NSF/ANSI 173. Revive MD costs $0.33, but Informed Sport tests for banned drugs, not the label. Our best magnesium glycinate pick is Revive MD, on Informed Sport, at $0.33 a day. For a label check, Nature Made is USP Verified, at $0.73 a day.
Our recommendation
Buy Revive MD Magnesium Glycinate
Informed Sport tests every batch for drugs banned in sport. It does not check the label. 2 capsules give 200 mg, all glycinate, for $0.33.
Buy on Amazon- Want a label check, not only a drug test? Nature Made is the only USP Verified glycinate capsule we found, and USP also tests bottles bought from stores. It costs $0.73 per 200 mg. The lowest-cost label check is Nature’s Truth Magnesium Glycinate, at $0.35.
- Drug-tested in sport? Core Med Science Magnesium Bisglycinate is on NSF Certified for Sport (#1810008), $0.40 per 200 mg.
Which magnesium glycinate supplements are third-party tested? (9)
An outside program lists each of these by name. All are glycinate only. Tap a badge to see the listing.
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Our pick, and the lowest cost (banned-drug test only)
Revive MD Pure Magnesium Glycinate
200 mg of magnesium in 2 capsules. Listing read August 24, 2026; Revive MD’s own page says it is Informed Sport certified.
$0.33 per 200 mg
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USP Verified: checks the label
Nature Made Magnesium Glycinate 200 mg
200 mg of magnesium in 2 capsules
$0.73 per 200 mg
Check price -
Lowest cost with a label check
Nature’s Truth Magnesium Glycinate 200 mg
200 mg of magnesium in 2 capsules
$0.35 per 200 mg
Buy on Amazon -
Double Wood Magnesium Glycinate 400 mg
60 mg of magnesium in one capsule. 200 mg is about 3 capsules.
$0.37 per 200 mg
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Lowest cost on NSF Certified for Sport
Core Med Science Magnesium Bisglycinate
NSF Certified for Sport #1810008NSF/ANSI 173
150 mg of magnesium in one capsule
$0.40 per 200 mg
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Thorne Magnesium Glycinate (capsules)
120 mg of magnesium in one capsule. The label allows up to 4 a day (480 mg), over the limit. Take 1 or 2.
$0.48 per 200 mg
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$0.50 per 200 mg
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Thorne Magnesium Bisglycinate Powder
NSF Certified for Sport #1507934NSF/ANSI 173
200 mg of magnesium in one scoop (3.77 g)
$0.87 per 200 mg
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$2.10 per 200 mg
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Cost is 200 mg of magnesium at each brand’s own list price, checked October 20, 2026; Amazon’s can differ. Also on a list, sold only by the brand or in stores: Momentous Magnesium Bisglycinate (NSF Certified for Sport, listing 1808823; sold on its own site) and up&up Magnesium Glycinate 200 mg (NSF/ANSI 173; sold at Target).
What is the cheapest certified magnesium glycinate?
Nature’s Truth Magnesium Glycinate, among products whose list checks the label. Here is the cheapest in each form:
| Form | Cheapest on a list |
|---|---|
| Capsules | Revive MD Pure Magnesium Glycinate, $0.33 (Informed Sport) |
| Powder | Codeage Liposomal Magnesium Glycinate Powder, $0.50 (NSF/ANSI 173) |
| Gummies | Nature Made Magnesium Glycinate Gummies, $2.10 (USP Verified). The only one we found. |
Some products sold as glycinate also mix in magnesium oxide. Why that matters.
Which magnesium glycinate is NSF certified?
6 of the glycinates above are on an NSF list. The cheapest is Nature’s Truth Magnesium Glycinate, on NSF/ANSI 173, which checks that the bottle holds what the label says. Core Med Science Magnesium Bisglycinate (#1810008) and Thorne Magnesium Bisglycinate Powder (#1507934) are also on NSF Certified for Sport, which screens each lot for banned drugs. Thorne’s capsules are on NSF/ANSI 173 only.
Is NOW magnesium glycinate third-party tested?
Not on a public list. NOW has no listings on NSF/ANSI 173, and its glycinate tablets and bisglycinate powder are not on USP Verified, Informed Choice or Informed Sport. Its NPA GMP seal is a factory audit, not a test of the bottle.
Not on any testing list (6)
We found no listing for these on the five public lists we searched. That is not a failed test: brands pay to join, and many do not. It means no outside group lists them for you to check.
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Nutricost Magnesium Glycinate
Nutricost says it is third-party tested but names no program you can look up.
$0.20 per 200 mg
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Doctor’s Best High Absorption Magnesium
Magnesium bound to lysine and glycine. The label names no testing program.
$0.20 per 200 mg
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NOW Magnesium Bisglycinate Powder
Its seals (NPA GMP, Non-GMO Project) audit the factory or check for GMOs, not what is in the bottle.
$0.21 per 200 mg
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NOW Magnesium Glycinate Tablets
Its NPA GMP seal audits the factory, not what is in the bottle.
$0.36 per 200 mg
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KAL Magnesium Glycinate 350
The label names no testing program.
No list price
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Nature’s Bounty Magnesium Glycinate 240 mg
The label names no testing program.
No list price
Check price
Is your glycinate really glycinate?
Not always. Some products sold as glycinate also contain magnesium oxide, the cheap form the body absorbs less well (NIH). Oxide packs more magnesium into each gram, so a blend can print a bigger number for less money. These 2 are on a testing list, and their labels are honest about the blend:
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Codeage Liposomal Magnesium Glycinate (capsules)
NSF Certified for Sport #1785061NSF/ANSI 173
350 mg of magnesium in 4 capsules, from glycinate and oxide
$0.57 per 200 mg
Check price -
Designs for Sport Magnesium Bisglycinate
NSF Certified for Sport #1778775
300 mg of magnesium in 2 capsules, from glycinate and oxide
$0.40 per 200 mg
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Read the words in brackets on the magnesium line. “(as magnesium glycinate)” or “(as magnesium bisglycinate)” means glycinate only. If oxide is named too, it is a blend. When oxide is not on the label, it should not be in the bottle. In November 2025, Health Canada recalled two 200 mg magnesium bisglycinate products, Life Brand and MapleLife, because they held magnesium oxide the label did not list. NSF/ANSI 173 also checks for ingredients the label does not list, so it can catch that.
What does each program check?
| Program | What it tells you |
|---|---|
| USP Verified | The bottle holds what the label says, with no harmful levels of listed contaminants. USP also tests bottles bought from stores. |
| NSF/ANSI 173 | The bottle holds what the label says and nothing else, with no harmful levels of contaminants. Not a banned-drug test. |
| NSF Certified for Sport | Everything NSF/ANSI 173 checks, plus a screen of each lot for drugs banned in sport. You can match your lot number. |
| Informed Choice | Store-bought samples are tested for drugs banned in sport, at least monthly. Not a contents check. |
| Informed Sport | Every batch is tested for drugs banned in sport before it is sold. Not a contents check. |
Only a banned-drug program matters if you are drug-tested in sport. Only a contents program checks that the label is right.
How to check your own bottle
- Look for a USP Verified or NSF mark on the bottle. “Third-party tested” with no program named is the brand’s word.
- Search the program’s own list by company, then match the product name and form. A brand can have one product listed and others not.
- On NSF Certified for Sport, match the lot number on your bottle to the listing.
- No mark? Ask the brand for its lab report. A useful one names the lab, the lot number and the magnesium result.
- Read the magnesium line: the form in brackets and the mg. That mg is the magnesium itself.
How much to take, and when to be careful
- The limit. The upper limit for adults is 350 mg a day of magnesium from supplements and medicines. Food does not count toward it (NIH). Too much magnesium from pills most often causes diarrhea, sometimes with nausea and stomach cramps. That is why the limit is set where it is (NIH).
- Kidneys. If you have kidney disease, ask your doctor before you take magnesium. Weak kidneys cannot clear the extra, so it can build up (NIH).
- Pregnancy. Pregnancy raises the RDA by 40 mg (350 to 400 mg a day, by age). Ask your prenatal provider before adding a supplement.
- Antibiotics. Take tetracyclines (such as doxycycline) or quinolones (such as ciprofloxacin) at least 2 hours before or 4 to 6 hours after magnesium (NIH).
- Osteoporosis drugs. Bisphosphonates such as alendronate: take them at least 2 hours apart from magnesium (NIH).
Questions
Is Nature Made magnesium glycinate USP Verified?
Yes. USP’s own list includes “Nature Made High Absorption Magnesium Glycinate 200mg Capsules” and the glycinate gummies (read October 20, 2026). They are the only USP Verified glycinates we found: the capsules cost $0.73 and the gummies $2.10 per 200 mg. We did not find Nature Made’s magnesium oxide tablets on USP’s list.
Is Thorne magnesium NSF Certified for Sport?
Not the capsules. Thorne Magnesium Glycinate capsules are on NSF/ANSI 173, which checks what is in the bottle. NSF Certified for Sport lists Thorne’s Magnesium Bisglycinate powder (#1507934) and stick packs, a different product.
Is BulkSupplements magnesium glycinate pure glycinate?
No. Its label says “Magnesium (as Magnesium Glycinate and Magnesium Oxide) 300mg.” It is on NSF/ANSI 173, which checks that the label is accurate, and the label is honest about the blend. Every product in the list above is glycinate only.
Is Doctor’s Best magnesium third-party tested?
Doctor’s Best High Absorption Magnesium is not on NSF/ANSI 173, NSF Certified for Sport, USP Verified, Informed Choice or Informed Sport. NSF has no listings for the company.
Does “third-party tested” on a label mean anything?
On its own, no. The phrase has no legal definition. What counts is whether you can check it: is the exact product on a public list, or does the brand post a lab report with a lot number you can match to your bottle?
How much magnesium glycinate should I take?
Keep magnesium from supplements at or under 350 mg a day, the adult upper limit (NIH). Food does not count toward it. Count the magnesium line on the label, not the weight of the glycinate. How much magnesium per day.
Best magnesium glycinate · cheapest magnesium glycinate · Thorne vs Doctor’s Best · magnesium guide.
Sources
- NSF/ANSI 173 (info.nsf.org) searched by company, and NSF Certified for Sport listing pages (nsfsport.com), read October 20, 2026. USP Verified product finder, read October 20, 2026. Informed Sport and Informed Choice brand lists, read August 24, 2026; Revive MD’s own product page, read October 20, 2026.
- Labels and prices: each brand’s own product page, read October 20, 2026 (the products on no list: October 14, 2026). We quote no Amazon prices.
- Health Canada recalls: Life Brand Magnesium Bisglycinate 200mg (November 12, 2025) and MapleLife Magnesium Bisglycinate 200mg (November 26, 2025), undeclared magnesium oxide.
- NIH Office of Dietary Supplements. Magnesium fact sheet for health professionals. Updated January 6, 2026.