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Magnesium Glycinate
Bottom line
In our scoring, Magnesium Glycinate rates likely effective: the research is fairly solid for blood pressure reduction. Our top-scored product is Doctor's Best High Absorption Magnesium Glycinate Lysinate (90/100), about $0.17 a day at a clinical dose of 200-400mg elemental magnesium daily. Bottom line: a reasonable pick if it fits your goal. This is our opinion, not medical advice; talk to your clinician before starting.
For sleep or calming down, magnesium glycinate is the form to reach for - the best-absorbed, best-tolerated option for most people.
- Evidence
- Likely Effective
- Category
- Vitamins & Minerals
- Best form
- magnesium bisglycinate chelate (Albion TRAACS)
- Effective dose
- 200-400mg elemental magnesium daily
- Lab tested
- 12 of 15 products
- Category
- Vitamins & Minerals
- Best form
- magnesium bisglycinate chelate (Albion TRAACS)
- Effective dose
- 200-400mg elemental magnesium daily
- Lab tested
- 12 of 15 products
Key takeaways
- →Strongest evidence is for blood pressure (~2/2 mmHg drop) and sleep quality - glycinate is the form to use when calming and relaxation are the goal.
- →Take 200-400mg of elemental magnesium in the evening; a '1,000mg' glycinate capsule only delivers ~141mg elemental, so read the Supplement Facts panel.
- →Nested Naturals ($0.13/day, third-party tested) is the budget value pick; Doctor's Best with Albion TRAACS chelate ($0.17/day) is the quality-value sweet spot.
- →Skip if you have severe kidney disease (CKD stage 4-5) - impaired excretion can cause hypermagnesemia. Separate dosing from tetracycline or fluoroquinolone antibiotics by 2-3 hours.
What Is Magnesium Glycinate?
For sleep or calming down, magnesium glycinate is the form to reach for - the best-absorbed, best-tolerated option for most people. Two things make it work. It absorbs much better than the cheap oxide most drugstore pills use, so more of what you swallow actually gets into you. And the glycine half of the molecule is calming on its own - it acts as an inhibitory neurotransmitter (a brain signal that quiets things down) and independently improves sleep quality. The form does double duty. There is also a decent chance you are running low to begin with: half the US population falls below the RDA, so for most people supplementing is a reasonable call.
The blood pressure evidence is the strongest of the bunch. Pooling more than 30 trials, magnesium at roughly 350-400mg/day consistently lowers blood pressure by about 2/2 mmHg. That is not a dramatic drop, but it is meaningful if you are sitting in borderline-hypertension territory. For sleep, studies of 500mg daily show better sleep quality and higher melatonin in older adults with insomnia. The anxiety evidence is the shakiest of the three - weaker and less consistent, so treat it as promising rather than proven.
Bottom line on the form: if you want the calming and sleep side of magnesium, glycinate is the one with the evidence behind it. If what you actually want is a laxative effect, or just the cheapest possible pill, citrate or oxide do that job. But for sleep, anxiety, and muscle relaxation, reach for the glycinate.
Does It Work? The Evidence
How A-F grades workMagnesium Glycinate earns a Likely Effective rating on the strength of its best-supported use: blood pressure reduction (grade A). The table below grades every claimed benefit on its own, including weaker and more heavily marketed uses, so one strong result never stands in for the rest.
Blood pressure reduction
Zhang et al. 2016 meta-analysis of 34 RCTs (Hypertension); PMID 27402922. Mean reduction: -2.00/-1.78 mmHg
Sleep quality improvement
Abbasi et al. 2012 RCT (J Res Med Sci); PMID 23853635. Araújo et al. 2023 systematic review (Nutrients)
Muscle cramp reduction
Garrison et al. 2012 Cochrane review (mixed); Roguin Maor et al. 2017 RCT (JAMA Intern Med) - positive in pregnancy cramps
Migraine prevention
American Academy of Neurology 2012 evidence-based guideline: 'probably effective' for migraine prevention at 600mg/day
Type 2 diabetes / glucose metabolism
Veronese et al. 2016 meta-analysis of 18 RCTs (Diabetes Care); improved fasting glucose and HOMA-IR in diabetic patients
Anxiety and stress reduction
Boyle et al. 2017 systematic review (Nutrients); PMID 28445426. Suggestive but limited quality evidence.
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| A | Blood pressure reduction | Zhang et al. 2016 meta-analysis of 34 RCTs (Hypertension); PMID 27402922. Mean reduction: -2.00/-1.78 mmHg | Supported |
| B | Sleep quality improvement | Abbasi et al. 2012 RCT (J Res Med Sci); PMID 23853635. Araújo et al. 2023 systematic review (Nutrients) | Early Signal |
| B | Muscle cramp reduction | Garrison et al. 2012 Cochrane review (mixed); Roguin Maor et al. 2017 RCT (JAMA Intern Med) - positive in pregnancy cramps | Early Signal |
| B | Migraine prevention | American Academy of Neurology 2012 evidence-based guideline: 'probably effective' for migraine prevention at 600mg/day | Early Signal |
| B | Type 2 diabetes / glucose metabolism | Veronese et al. 2016 meta-analysis of 18 RCTs (Diabetes Care); improved fasting glucose and HOMA-IR in diabetic patients | Early Signal |
| C | Anxiety and stress reduction | Boyle et al. 2017 systematic review (Nutrients); PMID 28445426. Suggestive but limited quality evidence. | Early Signal |
How to Choose: Forms, Doses & What Matters
Clinical dose: 200-400mg elemental magnesium daily; note: magnesium glycinate is ~14% elemental magnesium by weight, so 1,400-2,800mg glycinate powder yields the effective dose
Best forms: magnesium bisglycinate chelate (Albion TRAACS), magnesium glycinate
Aim for 200-400mg of elemental magnesium a day. That word elemental is the one that matters - on the Supplement Facts panel look for 'elemental magnesium' or 'as magnesium', not the big number on the front of the bottle. Take it in the evening, and if sleep is your main reason, 30-60 minutes before bed. Glycinate is gentle on the stomach and works with or without food. If a single dose runs over 200mg elemental, it is easier on you to split it into two - morning and evening. Here is the label trap to watch for: a bottle shouting '1,000mg magnesium glycinate' only gives you about 140mg of elemental magnesium, so always read for the elemental amount. As for when you will feel it: sleep effects can show up within 1-2 weeks, but blood pressure and anxiety benefits usually take 4-8 weeks of taking it every day before you can judge.
Who Should Take Magnesium Glycinate?
Reach for this if you are sleeping poorly, dealing with muscle cramps or tension, feeling wound up by stress or anxiety, or you already know your magnesium intake is low. Some people are more likely to be running short than others. The list includes: older adults (you absorb less as you age), people with type 2 diabetes (you flush more out in urine), anyone with a GI condition like Crohn's or celiac (you absorb less), heavy alcohol users, and people who have been on proton pump inhibitors (PPIs) or loop/thiazide diuretics long-term. Athletes can fall short too, since you lose magnesium in sweat. And if your meals are light on the magnesium-rich foods - dark leafy greens, nuts, seeds, whole grains, legumes - topping up with a supplement is a reasonable move.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
15 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 15 Products Compared
Doctor's Best High Absorption Magnesium Glycinate Lysinate
Doctor's Best$20.99 ÷ 123 days at 200mg/day (1 serving × 200mg)
Uses Albion TRAACS - the most research-backed chelated mineral technology. Best combination of quality and value.
Prices checked 2026-06-06. Cost shown is per clinically effective daily dose, not per pill.
Nature Made Magnesium Glycinate 200mg
Nature Made$12.31 ÷ 59 days at 200mg/day (1 serving × 200mg)
One of the few USP Verified magnesium glycinate products. The safety and quality assurance justifies the slight price premium.
Prices checked 2026-06-06. Cost shown is per clinically effective daily dose, not per pill.
Life Extension Magnesium Caps 500mg
Life Extension$9.00 ÷ 100 days at 500mg/day (1 serving × 500mg)
High elemental magnesium per cap, but the oxide component means lower overall absorption. Best for those wanting a high-dose general magnesium.
Prices checked 2026-06-08. Cost shown is per clinically effective daily dose, not per pill.
KAL Magnesium Glycinate 400mg
KAL
$17.00 ÷ 170 days at ~212mg/day (0.5 servings × 400mg)
High dose per serving but requires swallowing 4 tablets. Good for those who want to reach 400mg elemental from a single product.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
Nested Naturals Magnesium Glycinate
Nested Naturals
$16.45 ÷ 127 days at 200mg/day (1 serving × 200mg)
Strong value option with a clean label. Popular Amazon choice with positive reviews for sleep support.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
NOW Foods Magnesium Glycinate
NOW Foods$26.12 ÷ 174 days at 200mg/day (1 serving × 200mg)
Hard to beat on price-per-serving for magnesium glycinate. NOW Foods is a reliable mid-tier brand.
Prices checked 2026-06-08. Cost shown is per clinically effective daily dose, not per pill.
Nutricost Magnesium Glycinate
Nutricost$9.86 ÷ 62 days at 210mg/day (1 serving × 210mg)
One of Amazon's top-selling magnesium glycinates and a solid pure-bisglycinate formula at a clinical 210mg elemental dose, third-party tested in an NSF-certified facility. The catch is three capsules per serving and a middle-of-the-pack $0.25/day, so its popularity is driven more by brand and reviews than by value.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
Solgar Magnesium Glycinate
Solgar$21.72 ÷ 99 days at 200mg/day (1 serving × 200mg)
Legacy brand with 75+ year history. Solid but not exceptional in any single category.
Prices checked 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
Thorne Magnesium Bisglycinate
Thorne$43.00 ÷ 60 days at 200mg/day (1 serving × 200mg)
Thorne's manufacturing standards are among the highest in the industry, and this powder is individually NSF Certified for Sport. Trusted by Mayo Clinic and numerous sports teams. You pay a steep premium for it - several times the per-dose cost of our value picks.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
NatureBell Pure Magnesium Glycinate 500mg
NatureBell
$15.96 ÷ 114 days at 180mg/day (1 serving × 180mg)
One of Amazon's top-selling magnesium glycinates, and another example of the label trap: the '500mg' on the front is the glycinate compound, while the Supplement Facts panel discloses 90mg of elemental magnesium per capsule. In our view the marketing leads with the bigger compound number, and the suggested one-capsule serving is only 90mg, so reaching a clinical 200mg dose takes two to three capsules. At that real dose it lands around $0.17/day, which is solid value, and it is third-party certified for purity and potency.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
Nature's Bounty High Absorption Magnesium Glycinate
Nature's Bounty
$15.99 ÷ 59 days at 240mg/day (1 serving × 240mg)
A mainstream, widely available high-absorption glycinate at a clinical 240mg elemental dose (two capsules). Quality is reasonable for a mass-market brand, but it carries no USP, NSF, or third-party certification and sits mid-pack on value at $0.27/day.
Prices checked 2026-06-06. Cost shown is per clinically effective daily dose, not per pill.
Pure Encapsulations Magnesium (Glycinate)
Pure Encapsulations$37.20 ÷ 89 days at 120mg/day (1 serving × 120mg)
The gold standard for people with food sensitivities or allergies. Recommended by many integrative medicine practitioners.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
Double Wood Magnesium Glycinate 400mg
Double Wood
$13.25 ÷ 60 days at 180mg/day (1 serving × 180mg)
A hugely popular seller and a textbook example of the magnesium label trap: the '400mg' on the front is the weight of the magnesium glycinate compound, and only about 60mg of that is elemental magnesium (the part that matters). In our view the label leads with the compound weight over the ~60mg of elemental magnesium per capsule, so you need roughly three capsules to reach a clinical 200mg dose, which puts the real cost around $0.28/day.
Prices checked 2026-06-26. Cost shown is per clinically effective daily dose, not per pill.
Solaray Magnesium Glycinate
Solaray
$18.39 ÷ 30 days at 350mg/day (1 serving × 350mg)
A chelated bisglycinate with BioPerine (black pepper extract) for absorption, at a full 350mg elemental dose. The downsides are real: four capsules per serving and about $0.61/day make it one of the priciest options here, and it carries no USP, NSF, or third-party purity testing despite the Non-GMO Project seal.
Prices checked 2026-06-06. Cost shown is per clinically effective daily dose, not per pill.
Life Extension Neuro-Mag Magnesium L-Threonate
Life Extension$27.75 ÷ 30 days at 144mg/day (1 serving × 144mg)
Included for comparison. The only form shown to cross the blood-brain barrier in animal studies, but human evidence is very limited. Very expensive per mg of elemental magnesium.
Prices checked 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Doctor's Best High Absorption Magnesium Glycinate Lysinate Doctor's Best | Nature Made Magnesium Glycinate 200mg Nature Made | Life Extension Magnesium Caps 500mg Life Extension | KAL Magnesium Glycinate 400mg KAL | Nested Naturals Magnesium Glycinate Nested Naturals | NOW Foods Magnesium Glycinate NOW Foods | Nutricost Magnesium Glycinate Nutricost | Solgar Magnesium Glycinate Solgar | Thorne Magnesium Bisglycinate Thorne | NatureBell Pure Magnesium Glycinate 500mg NatureBell | Nature's Bounty High Absorption Magnesium Glycinate Nature's Bounty | Pure Encapsulations Magnesium (Glycinate) Pure Encapsulations | Double Wood Magnesium Glycinate 400mg Double Wood | Solaray Magnesium Glycinate Solaray | Life Extension Neuro-Mag Magnesium L-Threonate Life Extension |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brand Score | 90/100Winner | 89/100 | 86/100 | 85/100 | 84/100 | 84/100 | 83/100 | 83/100 | 81/100 | 78/100 | 77/100 | 77/100 | 71/100 | 71/100 | 69/100 |
| Dosing & Form | 25/25Winner | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 20/25 | 25/25 | 18/25 | 19/25 | 25/25 | 18/25 |
| Purity | 20/25 | 23/25Winner | 20/25 | 19/25 | 19/25 | 19/25 | 19/25 | 19/25 | 23/25 | 20/25 | 16/25 | 23/25 | 19/25 | 17/25 | 20/25 |
| Value | 22/25Winner | 18/25 | 21/25 | 21/25 | 18/25 | 20/25 | 18/25 | 19/25 | 10/25 | 20/25 | 16/25 | 11/25 | 16/25 | 10/25 | 9/25 |
| Transparency | 23/25 | 23/25 | 20/25 | 20/25 | 22/25 | 20/25 | 21/25 | 20/25 | 23/25 | 18/25 | 20/25 | 25/25Winner | 17/25 | 19/25 | 22/25 |
| Cost/Day | $0.17 | $0.21 | $0.09Winner | $0.10 | $0.13 | $0.15 | $0.16 | $0.22 | $0.72 | $0.14 | $0.27 | $0.42 | $0.22 | $0.61 | $0.93 |
| Dose/Serving | 200mg | 200mg | 500mg | 400mg | 200mg | 200mg | 210mg | 200mg | 200mg | 180mg | 240mg | 120mg | 180mg | 350mg | 144mg |
| Form | magnesium bisglycinate chelate (Albion TRAACS) | magnesium glycinate | magnesium oxide, citrate, succinate, bisglycinate chelate blend | magnesium glycinate (ActivTab technology) | magnesium bisglycinate chelate | magnesium bisglycinate | magnesium bisglycinate; 3 capsules per 210mg serving | magnesium glycinate chelate | magnesium bisglycinate chelate | magnesium glycinate; 90mg elemental per 500mg capsule, ~2 capsules for a clinical dose | magnesium glycinate; 2 capsules per 240mg serving | magnesium glycinate | magnesium bisglycinate; ~60mg elemental per 400mg capsule, ~3 capsules per clinical dose | magnesium bisglycinate chelate with BioPerine; 4 capsules per 350mg serving | magnesium L-threonate (Magtein) |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | ✓ Yes | No | ✓ Yes |
| Proprietary Blend | No | No | No | No | No | No | No | No | No | No | No | No | No | No | No |
Frequently Asked Questions
What is the best form of magnesium?
It depends on your goal. Magnesium glycinate is best for sleep, relaxation, and anxiety due to the calming effect of glycine and high bioavailability. Magnesium citrate is well-absorbed and good for general supplementation (also has a mild laxative effect). Magnesium oxide has the highest elemental magnesium per pill but the worst absorption (~4%) - best for treating constipation, not deficiency. Magnesium L-threonate (Magtein) may have unique benefits for brain health as it crosses the blood-brain barrier, but it's expensive and the human evidence is limited. Magnesium taurate is sometimes recommended for heart health.
How much elemental magnesium is in magnesium glycinate?
Magnesium glycinate (magnesium bisglycinate) is approximately 14.1% elemental magnesium by weight. A capsule containing 1,000mg of magnesium glycinate provides about 141mg of elemental magnesium. A capsule listed as '500mg magnesium glycinate' provides about 70mg elemental magnesium. ALWAYS check the Supplement Facts panel for the elemental magnesium amount, which is what matters for dosing. Some brands helpfully list both the total compound weight and the elemental amount.
Can I take magnesium glycinate every day long-term?
Yes. Magnesium is an essential mineral your body needs daily and does not store well. Long-term daily supplementation of 200-400mg elemental magnesium is considered safe for adults with normal kidney function. The NIH notes that chronically low magnesium intake is associated with increased risk of cardiovascular disease, type 2 diabetes, and osteoporosis. If anything, consistent daily supplementation is preferable to sporadic use.
When is the best time to take magnesium glycinate?
For sleep: 30-60 minutes before bed. For general supplementation or blood pressure: any consistent time works, though many people prefer evening dosing. If taking a larger dose (300-400mg), splitting into morning and evening doses may improve absorption and reduce any GI effects. Taking with food is not required for glycinate, but can help if you experience any mild stomach discomfort.
Magnesium glycinate vs magnesium citrate - which is better?
Magnesium glycinate is better for sleep, anxiety, and people with sensitive stomachs. It causes significantly less GI distress and the glycine has its own calming benefits. Magnesium citrate is better for general supplementation on a budget and for people who want mild constipation relief as a side benefit. Both have good bioavailability - substantially better than magnesium oxide. If your primary goal is sleep or relaxation, glycinate is the clear winner.
Will magnesium glycinate help with anxiety?
The evidence is promising but not definitive. A 2017 systematic review in Nutrients found suggestive evidence that magnesium supplementation may reduce subjective anxiety, particularly in people who are magnesium-deficient. The glycine in magnesium glycinate may provide additional calming effects through its action as an inhibitory neurotransmitter. It is not a replacement for evidence-based anxiety treatments (therapy, medication), but may be a helpful adjunct, particularly if you are not meeting your magnesium needs through diet.
How long does it take for magnesium glycinate to start working?
Onset depends on the benefit. Some people notice mild drowsiness within 30 to 60 minutes of the first evening dose because of the glycine component, which acts as an inhibitory neurotransmitter on its own. Consistent sleep-quality improvements typically show up after 1 to 2 weeks of nightly use. Blood pressure changes lag the most: the Zhang 2016 meta-analysis pooled trials in the 6 to 24 week range, so allow 4 to 8 weeks at 350 to 400mg elemental daily before judging effect on a reading. Muscle cramp and stress effects sit between those windows, usually 2 to 4 weeks. If you have noticed nothing after 8 consistent weeks at a clinical dose, the issue is more often the underlying cause than the supplement.
Is magnesium glycinate safe to take during pregnancy?
Yes, at standard doses, but confirm with your OB before starting. The RDA for pregnant adults is 350 to 360mg elemental magnesium daily, slightly higher than the non-pregnant recommendation, and most prenatal vitamins do not include the full amount. Glycinate is generally the preferred supplemental form during pregnancy because it is well-tolerated and lacks the laxative effect common with citrate and oxide forms, which is useful given that constipation is already a frequent pregnancy complaint. A 2021 meta-analysis of randomized controlled trials (Liu et al., Taiwanese Journal of Obstetrics & Gynecology; PMID 34247796) found oral magnesium supplementation significantly reduced the frequency and intensity of leg cramps in pregnancy. Avoid the magnesium L-threonate (Magtein) form during pregnancy because it has not been studied in pregnant populations.
Related Supplements
Related Reading
Related Articles
Sources
- NIH Office of Dietary Supplements. Magnesium Fact Sheet for Health Professionals. Updated 2023.
- Zhang X, et al. Effects of Magnesium Supplementation on Blood Pressure: A Meta-Analysis of 34 Randomized, Double-Blind, Placebo-Controlled Trials. Hypertension. 2016;68(2):324-333.
- Abbasi B, et al. The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial. J Res Med Sci. 2012;17(12):1161-1169.
- Boyle NB, et al. The Effects of Magnesium Supplementation on Subjective Anxiety and Stress - A Systematic Review. Nutrients. 2017;9(5):429.
- Uysal N, et al. Timeline (Bioavailability) of Magnesium Compounds in Hours: Which Magnesium Compound Works Best? Biol Trace Elem Res. 2019;187(1):128-136.
- Bannai M, Kawai N. New therapeutic strategy for amino acid medicine: glycine improves the quality of sleep. J Pharmacol Sci. 2012;118(2):145-148.
- Veronese N, et al. Effect of magnesium supplementation on glucose metabolism in people with or at risk of diabetes: a systematic review and meta-analysis. Eur J Clin Nutr. 2016;70(12):1354-1359.
- Rosanoff A, Weaver CM, Rude RK. Suboptimal magnesium status in the United States: are the health consequences underestimated? Nutr Rev. 2012;70(3):153-164.
Scores and tiers are our independent opinion, formed by applying a published rubric to label data, third-party certifications, and the research record. They are not statements of objective fact about a product and not a lab test. Where we report a brand-specific fact, it comes from a cited source or a public certification; where verification is missing, we say so rather than assume a result.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.