Top 8 Best Magnesium L-Threonate (Magtein) Supplements (2026)
01 · Best overall✓ Label verified · Supplement Facts read Sep 7, 2026Best overall: Momentous Magnesium L-Threonate (Magtein)
NSF Certified for Sport on the licensed Magtein form — the federation-safe threonate for drug-tested athletes who can't risk contamination.
$35 / 90 caps (30-day supply)~$1.17 / 3-cap serving
Why it wins: all five scores, pros & cons, full label
- NSF Certified for Sport — the federation-grade testing standard
- Licensed Magtein at the full trial dose
- Athlete-grade sourcing and QC; trusted in pro-sports circles
- Same brain effect as Neuro-Mag (#2) with banned-substance certification layered on
- Highest cost per serving on the list (~$1.17)
- You're paying for certification, not a better cognitive effect
- Per serving
- 2000 mg Magtein = 145 mg elemental Mg (3 capsules)
- Active form
- Magnesium L-Threonate (licensed Magtein)
- Bottle / supply
- 90 caps = 30-day supply at 3 caps/day
- Testing
- NSF Certified for Sport — banned-substance tested
Our take — If you're drug-tested, this is the answer. NSF Certified for Sport means every batch is screened against banned substances — a level of assurance recreational users don't need but every federation athlete does. The Magtein and the trial dose are identical to Neuro-Mag (#2); the premium buys the certification, not extra brain magnesium. Worth it if your sport requires it; if you're not tested, Neuro-Mag (#2) delivers the same dose for less.
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08Who Wins Which Aspect
Sorted by overall SAC Product Score™ — the official ranking.
| # | Pick | Score | Form / Magtein verification30% | Elemental Mg + dose honesty25% | Third-party testing + QC20% | Cost per elemental mg15% | Real-world response + value10% | Cost Per Dose | Buy |
|---|---|---|---|---|---|---|---|---|---|
| 01 | | 8.8 | 9.51 | 8.51 | 9.81 | 6.5 | 9.01 | ~$1.17 / 3-cap serving | Check price |
| NSF Certified for Sport — the federation-grade testing standardHighest cost per serving on the list (~$1.17) | |||||||||
| 02 | | 8.5 | 9.51 | 7.0 | 9.02 | 8.02 | 9.01 | ~$0.93 / 3-cap serving | Check price |
| Licensed, patent-verified Magtein — the form the RCTs measuredNot NSF Certified for Sport — drug-tested athletes should jump to Momentous (#1) | |||||||||
| 03 | | 8.4 | 9.51 | 8.02 | 8.0 | 7.03 | 9.01 | ~$1.00 / 3-cap serving | Check price |
| Jarrow's long QC track record — one of the original Magtein brandsNo clear advantage over Neuro-Mag (#2) at a similar price | |||||||||
| 04 | | 8.3 | 9.51 | 7.0 | 8.0 | 8.51 | 8.52 | ~$0.77 / 4-cap serving | Check price |
| Cheapest verified Magtein per serving on the list (~$0.77)4 capsules per dose instead of 3 — a bigger daily pill load | |||||||||
| 05 | | 8.3 | 9.51 | 7.0 | 8.53 | 7.03 | 9.01 | ~$1.07 / 3-cap serving | Check price |
| NOW's in-house QC is among the most consistent in the industry (30+ years)Slightly higher per-serving cost than Neuro-Mag (#2) or Jarrow (#3) | |||||||||
| 06 | | 8.0 | 9.51 | 7.0 | 7.5 | 7.03 | 8.52 | ~$1.00 / 3-cap serving | Check price |
| Licensed Magtein at the standard 3-cap trial doseNo clear advantage over the picks above | |||||||||
| 07 | | 8.0 | 9.02 | 8.02 | 7.0 | 7.03 | 8.52 | ~$1.10 / 3-cap serving | Check price |
| Magtein named on the panel, at the 2,000 mg trial doseThird Party Tested names no lab and has no NSF listing | |||||||||
| 08 | | 7.0 | 6.53 | 7.53 | 6.5 | 8.02 | 7.03 | ~$1.00 / 5-cap serving | Check price |
| Lower sticker price than the major brandsHeavy 5-cap-per-day pill load — the most capsules on the list | |||||||||
The Other 7, Ranked
- 02
The QC benchmark: Life Extension Neuro-Mag Magnesium L-Threonate
8.5SAC Score™The category benchmark. Licensed, patent-verified Magtein at the exact Liu 2016 trial dose, backed by Life Extension's published per-batch testing — the cleanest default for cognition.
StrongestForm / Magtein verification9.51WeakestElemental Mg + dose honesty7.0- Per serving
- 2000 mg Magtein = 144 mg elemental Mg (3 capsules)
- Active form
- Magnesium L-Threonate (licensed Magtein)
- Bottle / supply
- 90 caps = 30-day supply at 3 caps/day
All five scores, pros & cons, full label
What We Like- Licensed, patent-verified Magtein — the form the RCTs measured
- Exact Liu 2016 trial dose (2000 mg Magtein) at 3 caps/day
- Life Extension's QC and per-batch transparency is the category benchmark
- Fair ~$0.93/serving for the elite-QC tier
What You Live With- Not NSF Certified for Sport — drug-tested athletes should jump to Momentous (#1)
- Like all threonate, low elemental yield — pair a glycinate for peripheral needs
- Testing
- Per-batch testing published; Magtein chain-of-custody documented
Our take — The QC benchmark, and the bottle the rest of the list is measured against. You get verified Magtein, the precise trial dose at a manageable 3 capsules, and Life Extension's published per-batch testing — all at a fair price for the QC tier. Run it in the morning, give it 4-12 weeks, and stack a magnesium glycinate at night if you also want sleep and cramp coverage. The only honest reasons to pick something else: federation drug testing (Momentous #1) or squeezing the lowest price (Double Wood #4).
- 03
Best from a household brand: Jarrow Formulas MagMind (Magtein)
8.4SAC Score™One of the original Magtein brands, with Jarrow's long QC pedigree. Licensed Magtein at the standard 3-cap trial dose.
StrongestForm / Magtein verification9.51WeakestCost per elemental mg7.0- Per serving
- 2000 mg Magtein = 144 mg elemental Mg (3 capsules)
- Active form
- Magnesium L-Threonate (licensed Magtein)
- Bottle / supply
- 90 caps = 30-day supply at 3 caps/day
All five scores, pros & cons, full label
What We Like- Jarrow's long QC track record — one of the original Magtein brands
- Licensed Magtein at the standard 3-cap trial dose
- Widely stocked online and in stores — easy backup pick
What You Live With- No clear advantage over Neuro-Mag (#2) at a similar price
- QC documentation is solid but less publicly detailed than Life Extension's
- Testing
- Jarrow in-house QC; established batch testing
Our take — A long-trusted, no-surprises Magtein. MagMind was one of the first threonate products to market and Jarrow's QC reputation is well-earned. It does everything Neuro-Mag (#2) does at a comparable price, without a standout edge — so slot it in when it's the better-stocked or better-priced option on the day. Solid, reliable, fairly priced.
- 04
Best value: Double Wood Magnesium L-Threonate (Magtein)
8.3SAC Score™The cheapest verified Magtein per serving on the list, and it's NSF Certified. The only catch is a 4-cap daily dose instead of 3.
StrongestForm / Magtein verification9.51WeakestElemental Mg + dose honesty7.0- Per serving
- 2000 mg Magtein = 144 mg elemental Mg (4 capsules)
- Active form
- Magnesium L-Threonate (licensed Magtein)
- Bottle / supply
- 120 caps = 30-day supply at 4 caps/day
All five scores, pros & cons, full label
What We Like- Cheapest verified Magtein per serving on the list (~$0.77)
- NSF Certified — strong third-party testing at a budget price
- Licensed Magtein at the full 2000 mg trial dose
- Good entry point for first-time threonate buyers
What You Live With- 4 capsules per dose instead of 3 — a bigger daily pill load
- Brand QC sits a tier below Life Extension's published-batch transparency
- Testing
- NSF Certified; third-party batch testing
Our take — The value pick, and it doesn't cut the corner that matters: it's licensed Magtein, NSF Certified, at the full trial dose. The only trade-off is swallowing four capsules a day instead of three for the same 2000 mg. If price is your deciding factor and you still want verified Magtein with third-party testing, this is the obvious buy. We also publish a full hands-on review of this exact bottle — see the linked deep-dive.
- 05
Best widely-available: NOW Foods Magtein Magnesium L-Threonate
8.3SAC Score™NOW's 30+ year in-house QC applied to licensed Magtein. The easiest pick to find on a shelf or in stock online.
StrongestForm / Magtein verification9.51WeakestElemental Mg + dose honesty7.0- Per serving
- 2000 mg Magtein = 144 mg elemental Mg (3 capsules)
- Active form
- Magnesium L-Threonate (licensed Magtein)
- Bottle / supply
- 90 caps = 30-day supply at 3 caps/day
All five scores, pros & cons, full label
What We Like- NOW's in-house QC is among the most consistent in the industry (30+ years)
- Licensed Magtein at the standard 3-cap trial dose
- Easy to source offline at most US health stores as a backup
What You Live With- Slightly higher per-serving cost than Neuro-Mag (#2) or Jarrow (#3)
- Not NSF Certified for Sport — use Momentous (#1) if you need that
- Testing
- NOW in-house labs; GMP-certified; batch QC
Our take — The 'grab it off the shelf' Magtein. NOW's three-decade QC pedigree justifies a small premium, and it's the easiest pick to find in stock when the top brands sell out. Same licensed Magtein and trial dose as Neuro-Mag (#2) — just a touch pricier per serving. A dependable backup rather than a first choice.
- 06
Solid alternative: Source Naturals Magtein Magnesium L-Threonate
8.0SAC Score™Licensed Magtein at 667 mg per capsule from an established brand. No standout edge, but a fine pick when it's the one in stock.
StrongestForm / Magtein verification9.51WeakestElemental Mg + dose honesty7.0- Per serving
- 2000 mg Magtein = 144 mg elemental Mg (3 capsules)
- Active form
- Magnesium L-Threonate (licensed Magtein)
- Per capsule
- 667 mg Magtein per capsule
All five scores, pros & cons, full label
What We Like- Licensed Magtein at the standard 3-cap trial dose
- Established brand with consistent batch QC
- Priced in line with the mid-tier picks
What You Live With- No clear advantage over the picks above
- Less public QC documentation than Life Extension or NOW
- Bottle / supply
- 90 caps = 30-day supply at 3 caps/day
Our take — A perfectly fine Magtein with no reason to rank it higher and no reason to avoid it. Source Naturals has been in the threonate game a long time and the form is verified. If it's the best-priced or best-stocked licensed Magtein on the day you're buying, it'll do the job exactly as well as the picks above.
- 07
150 mg Magnesium Printed: Nutricost Magtein Magnesium L-Threonate
8.0SAC Score™Magtein at the 2,000 mg trial dose on a two-line panel, with 150 mg of magnesium printed clearly. A fair pick if you like the label, held back by a testing claim that names no lab and a price above most of the list.
StrongestForm / Magtein verification9.02WeakestThird-party testing + QC7.0- Per serving
- 2000 mg Magtein, 150 mg magnesium printed (3 capsules)
- Active form
- Magnesium L-Threonate (Magtein, named on the panel)
- Bottle / supply
- 90 caps = 30-day supply at 3 caps/day
All five scores, pros & cons, full label
What We Like- Magtein named on the panel, at the 2,000 mg trial dose
- 150 mg of magnesium printed on its own line with a %DV
- 3 capsules a day, vegetarian capsule, short list of other ingredients
What You Live With- Third Party Tested names no lab and has no NSF listing
- Not shown among the partner brands on magtein.com, so the licence is unconfirmed
- About $1.10 a serving, above most of the other Magtein bottles
- Testing
- Third Party Tested printed, no lab named · no NSF Certified for Sport or NSF/ANSI 173 listing
Our take — The pick for a buyer who wants Magtein at the trial dose in three capsules and a plain label. The panel prints 2,000 mg of Magtein and 150 mg of magnesium, and about $1.10 a serving is a mid-range price. What holds it back is a Third Party Tested claim with no lab behind it, a licence we could not match at magtein.com, and cheaper bottles that give you more to verify: Life Extension (8.5) and Double Wood (8.3). The label also puts two of the three capsules at bedtime, so move the doses earlier if it keeps you awake.
- 08
Budget (verify the label): Pure North Naturals Magnesium L-Threonate
7.0SAC Score™A lower sticker price from a smaller brand, but a heavier 5-cap daily load. Reasonable if budget is the deciding factor — just confirm the Magtein trademark on the live label.
StrongestCost per elemental mg8.02WeakestForm / Magtein verification6.5- Per serving
- 144 mg elemental Mg (5 capsules)
- Active form
- Magnesium L-Threonate (Magtein on label)
- Bottle / supply
- 125 caps = ~25-day supply at 5 caps/day
All five scores, pros & cons, full label
What We Like- Lower sticker price than the major brands
- Third-party tested; 144 mg elemental per serving on label
- Reasonable budget option if you confirm the Magtein trademark
What You Live With- Heavy 5-cap-per-day pill load — the most capsules on the list
- Smaller brand with less established QC — verify the label before buying
- Per-serving cost isn't actually lower once you account for caps-per-dose
- Testing
- Third-party tested
Our take — The budget end of the list, with the usual caveats. The sticker price looks low, but the 5-cap daily dose means the real per-serving cost lands around the same as the mid-tier picks, and the brand's QC is less established. It's a fine choice if budget is genuinely the deciding factor and you've confirmed the Magtein trademark on the current label — otherwise the small step up to Double Wood (#4) or Neuro-Mag (#2) buys you more confidence.
Magnesium Glycinate In Four Short Lessons
Why threonate is the only magnesium that reaches the brain
- Only 1
- Magnesium form shown to meaningfully cross the blood-brain barrier
- +9%
- Executive-function improvement vs placebo at 12 weeks (Liu 2016, 2000 mg)
- 144 mg
- Elemental magnesium per 2000 mg Magtein serving (the low-elemental trap)
- ~75%
- US adults below the magnesium RDA — but that gap needs glycinate, not threonate
Sources: Slutsky 2010 Neuron (PMID 20152124); Liu 2016 MMFS-01 RCT (PMID 26519439); Abumaria 2011 J Neurosci (PMID 22016520); Rosanoff 2012 Nutr Rev (PMID 22364157).
Buy it only for cognition.
Threonate is the one form with trial evidence for raising brain magnesium (Slutsky 2010). For sleep or cramps its elemental yield is too low; buy a glycinate instead.
Know that 2000 mg is about 144 mg of magnesium.
Threonate is only about 7% magnesium by weight. Dose by the Magtein compound to hit the trial dose, not by an elemental target.
Do the capsules-per-day math.
The trial dose is 3 to 4 capsules a day, so a 90-count bottle lasts a month. It costs 8-12x more per milligram of magnesium than a glycinate.
Slutsky 2010 (Neuron, PMID 20152124) and the Liu 2016 MMFS-01 RCT (PMID 26519439): 2000 mg Magtein/day for 12 weeks improved executive function by ~9% vs placebo in older adults. Also cited: Abumaria 2011 (PMID 22016520), Zhang 2022, and Rosanoff 2012 (PMID 22364157).
Each pick was scored 0-10 across five criteria, then weighted to a final composite. Magtein verification carries the most weight because the licensed, patented stereoisomer is the only L-threonate the RCTs actually measured — generic threonate may work, but it's unproven. Elemental magnesium and dose honesty (caps-per-dose, label clarity) come next, because the low-elemental trap and the '90-count = 30 days' surprise are where buyers get burned. Third-party testing and brand QC set the safety floor, and cost per elemental mg is the economic tiebreaker within an inherently premium category.
Form / Magtein verification · 30%
Does it use licensed, patent-verified Magtein (the form in Slutsky 2010 and Liu 2016) or unverified generic 'magnesium L-threonate'? Licensed Magtein gets the top score; generic loses points for lack of comparative trial data.
Elemental Mg + dose honesty · 25%
Does the serving hit the ~144 mg elemental / 2000 mg Magtein trial dose, and is the label honest about caps-per-dose and elemental yield? Bottles that obscure the '90-count = 30-day' math or imply 2000 mg of elemental magnesium lose points.
Third-party testing + QC · 20%
NSF Certified for Sport, NSF Certified, or published per-batch testing, plus the brand's track record. NSF for Sport wins for drug-tested athletes; published batch testing and a long QC history win for everyone else.
Cost per elemental mg · 15%
True monthly cost divided by elemental magnesium delivered, accounting for caps-per-dose. The honest target is $0.70-1.00 per trial-dose serving; above ~$1.20 you're paying a brand premium.
Real-world response + value · 10%
Documented cognitive response (the threonate signal is modest but reproducible) and overall value within the threonate tier. Acts as the tiebreaker between otherwise-equivalent Magtein bottles.
How magnesium L-threonate works on the brain
- 1
Threonate ferries magnesium across the BBB
L-threonic acid acts as a carrier that gets magnesium across the blood-brain barrier — something glycinate, citrate, and oxide can't do efficiently. This is the entire reason the form exists.
- 2
Brain magnesium concentration rises
In the Slutsky 2010 work, only threonate measurably raised brain-magnesium levels. Elevated brain Mg regulates NMDA glutamate-receptor density — the receptor system behind learning and memory.
- 3
Synaptic plasticity + cognition improve
Higher NMDA-receptor density supports synaptic plasticity. Over weeks this shows up as better memory and executive function — Liu 2016 measured ~9% improvement at 12 weeks in older adults.
What to expect on magnesium L-threonate
Mostly nothing (maybe mild alertness)
No dramatic shift. Some users notice subtle daytime alertness from the brain-Mg effect — which is why morning dosing matters. Don't expect a stimulant.
Subjective recall + focus
Sharper word recall and less brain fog on demanding mental work start to surface anecdotally. The signal is real but modest — track a baseline so you can tell.
Measurable cognitive benefit
The Liu 2016 trial measured executive-function improvement at 12 weeks. This is a long-game lever — evaluate at the 3-month mark, not the 3-day mark.
The bottom line
Momentous (#1) is the overall winner; Life Extension Neuro-Mag (#2) is the QC-benchmark cognition pick.
Momentous (#1) tops the list: licensed Magtein at the trial dose with NSF Certified for Sport testing layered on. If you're not drug-tested, Neuro-Mag (#2) is the QC benchmark: licensed Magtein, the exact trial dose at a manageable 3 capsules, category-best QC, and a fair ~$0.93/serving price. The rest of the list is measured against it. Run it in the morning and give it 4-12 weeks.
Double Wood (#4) for value; Momentous (#1) if you're drug-tested; #3 and #5-7 are situational.
Double Wood (#4) is the value pick for the same verified Magtein at ~$0.77/serving if you don't mind a 4-capsule dose. Momentous (#1) is the call if you're drug-tested and need NSF Certified for Sport. Jarrow, NOW, and Source Naturals are dependable licensed-Magtein backups, with Pure North Naturals the budget play once you've verified the label.
Verify Magtein, take it AM, hold it 4-12 weeks, and stack a glycinate at night.
Take the 2000 mg Magtein trial dose in the morning or early afternoon since it can be mildly activating at night, and give it 4-12 weeks rather than judging it in days. Confirm the Magtein trademark on the label and do the caps-per-dose math so the '90-count = 30 days' reality doesn't surprise you. Pair a magnesium glycinate at bedtime for the peripheral benefits threonate can't cover.
Quick Answers
Magnesium L-threonate vs glycinate — which should I buy?
They solve different problems and most people who research carefully end up running both. Glycinate is the peripheral/body form: high elemental magnesium, gentle on the gut, the right pick for sleep onset, anxiety, muscle cramps, and correcting a magnesium deficiency. L-threonate is the central/brain form: the only magnesium with trial data (Slutsky 2010, Liu 2016) showing it meaningfully raises BRAIN magnesium and supports memory, focus, and executive function. The catch is that threonate delivers only ~144 mg of elemental magnesium per serving — too little to fix sleep or cramps. So: cognition is your goal -> threonate. Sleep, cramps, deficiency -> glycinate. Both goals -> threonate AM + glycinate PM.
Is magnesium L-threonate worth the premium over cheaper magnesium?
Only if cognition is specifically what you're buying. A magnesium glycinate costs $0.08-0.15 per serving and delivers far more elemental magnesium; threonate runs $0.70-1.20 per serving and delivers less. On a cost-per-elemental-mg basis, threonate is 8-12x more expensive and looks like a terrible deal. But that's the wrong comparison — you're not paying for elemental magnesium, you're paying for the only form that gets magnesium into brain tissue. There is no cheaper way to do that. If you want the brain effect, the premium is justified. If you just want 'more magnesium,' it's a waste of money.
Why is the elemental magnesium so low (only 144 mg)?
Because L-threonate is a heavy carrier molecule. Magtein is the magnesium salt of L-threonic acid (a vitamin C metabolite), and magnesium is only about 7% of that compound by weight — so 2000 mg of Magtein yields ~144 mg of actual elemental magnesium. Compare bisglycinate at ~14% elemental. This is the single biggest misconception in the category: people see '2000 mg magnesium L-threonate' and assume 2000 mg of magnesium. It isn't. For brain delivery that's fine — the threonate IS the feature. But it means this is the wrong form for repletion, sleep, or cramps, where you actually need the higher elemental dose from glycinate.
How many capsules do I actually have to take, and how long does a bottle last?
The trial dose is 3 capsules per day for most brands (Life Extension, Jarrow, NOW, Momentous, Source Naturals) and 4 capsules per day for Double Wood. That means a '90-count' bottle is a 30-day supply, not 90 days, and Double Wood's '120-count' is also 30 days. This trips up first-time buyers who think they're getting a 3-month supply. Always divide the cap count by caps-per-dose to get the real number of days, then compute true monthly cost before comparing prices across brands.
Does the Magtein patent actually matter, or is generic L-threonate fine?
It matters more here than in most supplement categories. Magtein is the specific, quality-controlled stereoisomer of magnesium L-threonate that the published RCTs (Slutsky 2010, Liu 2016, Abumaria 2011) actually measured. Generic 'magnesium L-threonate' on Amazon is increasingly common at a lower price, but the chemistry is not guaranteed identical, and there's no comparative trial data showing generics deliver the same brain uptake. For a form whose entire value proposition is crossing the blood-brain barrier, paying the small premium for verified, licensed Magtein is worth it. Check the label or supplement-facts panel for the Magtein trademark.
When will I notice anything, and what should I expect to feel?
Expect subtle and slow, not a same-day stimulant. The Liu 2016 trial measured improvement on executive-function tests at 12 weeks. Anecdotally, users report sharper word recall and less brain fog on demanding mental work around weeks 4-6. The mechanism is structural — threonate raises brain magnesium, which regulates NMDA glutamate-receptor density and synaptic plasticity — so the benefit accrues over time rather than hitting in an hour. If you want acute focus, that's caffeine + L-theanine; threonate is the long-game lever for the aging or high-demand brain.
Can I take magnesium L-threonate at night to help me sleep?
It's not the right form for sleep, and for some people it's mildly counterproductive at night. Threonate's brain-magnesium effect can be subtly activating (increased synaptic activity reads as alertness), so evening dosing can interfere with sleep onset in sensitive users — the opposite of glycinate, which is calming. If sleep is your goal, take a magnesium glycinate 60-90 minutes before bed and keep threonate to the morning/early afternoon. If you want both brain support and better sleep, that's exactly the threonate-AM / glycinate-PM stack.
Every Claim Ranked Above Traces Back To One Of These
5 sources — studies link to PubMed, product specs to the manufacturer
- [1] Slutsky 2010 PMID 20152124 — Enhancement of learning and memory by elevating brain magnesium. The MIT paper that founded the magnesium L-threonate category. Showed brain-magnesium levels rise only with L-threonate (not other magnesium forms), with downstream increases in NMDA-receptor density, synaptic plasticity, and learning + memory. The foundational evidence for the BBB-crossing claim.
- [2] Liu 2016 PMID 26519439 — Efficacy and safety of MMFS-01, a synapse density enhancer, for treating cognitive impairment in older adults: a randomized, double-blind, placebo-controlled trial. The human RCT (MMFS-01) anchoring the cognitive evidence: 2000 mg Magtein/day for 12 weeks improved executive function by ~9% on standardized tests vs placebo in older adults. Establishes the trial dose used across this list (2000 mg Magtein = 144 mg elemental).
- [3] Abumaria 2011 PMID 22016520 — Effects of elevation of brain magnesium on fear conditioning, fear extinction, and synaptic plasticity. Follow-up to Slutsky 2010: L-threonate-driven brain-magnesium elevation enhanced fear extinction and synaptic plasticity in prefrontal cortex. Extends the mechanistic case beyond memory toward emotional regulation.
- [4] Zhang 2022 — A magtein, magnesium L-threonate, based formula improves cognitive ability in healthy older adults: a 12-week randomized, double-blind, placebo-controlled trial. A more recent randomized, placebo-controlled trial of a Magtein-based formula in healthy older adults showing improvement on cognitive-ability measures over 12 weeks. Reinforces the Liu 2016 dose and timeline for the healthy-aging population.
- [5] Rosanoff 2012 PMID 22364157 — Suboptimal magnesium status in the United States: are the health consequences underestimated?. Population-level evidence that a large share of US adults fall below the magnesium RDA. Important context: this peripheral magnesium gap is best closed with a high-elemental form like glycinate, NOT threonate — which is why we route deficiency buyers away from this category.
More Magnesium Glycinate Guides
- Best Magnesium SupplementsThe definitive magnesium buying guide — the single best pick for each need across glycinate, L-threonate, and citrate. Glycinate is the default for sleep & anxiety; threonate for cognition; citrate for regularity; oxide is junk.
- Best Form of Magnesium: All Forms Compared by Use CaseThere's no single best magnesium — the right form depends on your goal. Glycinate for sleep + anxiety, citrate for constipation, L-threonate for cognition, oxide to skip. All forms compared by bioavailability + use case.
- Best Magnesium for AnxietyGlycinate dominates the anxiety use case harder than the sleep use case — glycine hits the NMDA co-agonist site, magnesium potentiates GABA-A. Ranked for the 300-500 mg anxiety dose window + AM/PM cortisol-smoothing flexibility.
- Best Magnesium for ConstipationCitrate dominates (osmotic) and glycinate sinks (chelated, no laxative effect) — the form ranking is fully inverted vs. magnesium-for-sleep, with acute breakthrough + chronic maintenance protocols spelled out.
- Best Magnesium for Leg CrampsTen magnesium products ranked for leg + muscle cramps by which form reaches muscle tissue — glycinate and citrate lead, brain-targeted L-threonate drops.
- Best Magnesium for MigrainesTen magnesium supplements for migraine prophylaxis — ranked by form, the 400-600mg AAN/AHS Level B dose, high-dose tolerability, testing, and price.
- Best Magnesium for SleepThe magnesium forms that actually shift sleep depth — glycinate + L-threonate dominate, oxide is mostly placebo. Ranked by bioavailability + trial evidence.
- Best Magnesium Glycinate SupplementsMagnesium glycinate ranked by ELEMENTAL magnesium (not compound mg), true-chelate integrity, and third-party testing — the form for sleep, anxiety and repletion.
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