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Magnesium Glycinate: Scored and Compared (2026)
Last reviewed: 2025-03-01 | 10 products scored | Clinical dose: 200-400mg elemental magnesium daily (note: magnesium glycinate is ~14% elemental magnesium by weight) | Prices checked: 2025-03-01
The Bottom Line
Magnesium is the fourth most abundant mineral in the body and a cofactor in over 300 enzymatic reactions, including energy production, protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation. According to the NIH Office of Dietary Supplements, subclinical magnesium deficiency - insufficient intake without overt symptoms - is estimated to affect up to 50% of the US population based on NHANES data showing that average dietary magnesium intake falls well below the RDA of 310-420mg/day for adults. The glycinate (bisglycinate) form chelates magnesium with the amino acid glycine, creating a compound with superior bioavailability compared to cheaper forms like magnesium oxide. Our top pick is Doctor's Best High Absorption Magnesium Glycinate Lysinate (Grade: A-, $0.13/day).
Quick Picks
What Is Magnesium Glycinate?
Magnesium is the fourth most abundant mineral in the body and a cofactor in over 300 enzymatic reactions, including energy production, protein synthesis, muscle and nerve function, blood glucose control, and blood pressure regulation. According to the NIH Office of Dietary Supplements, subclinical magnesium deficiency - insufficient intake without overt symptoms - is estimated to affect up to 50% of the US population based on NHANES data showing that average dietary magnesium intake falls well below the RDA of 310-420mg/day for adults. The glycinate (bisglycinate) form chelates magnesium with the amino acid glycine, creating a compound with superior bioavailability compared to cheaper forms like magnesium oxide. A 2019 study by Uysal et al. in Biological Trace Element Research confirmed that magnesium bisglycinate achieves significantly higher serum magnesium levels than oxide at equivalent doses. The glycine component itself has calming properties - it acts as an inhibitory neurotransmitter and has been shown in a 2012 study in the Journal of Physiological Anthropology to improve subjective sleep quality. For blood pressure, the evidence is strong. A 2016 meta-analysis by Zhang et al. in Hypertension, analyzing 34 RCTs with over 2,000 participants, found that magnesium supplementation (mean dose ~368mg/day) produced a significant reduction of 2.00 mmHg systolic and 1.78 mmHg diastolic blood pressure. For sleep, a 2012 RCT by Abbasi et al. in the Journal of Research in Medical Sciences found that 500mg magnesium daily significantly improved subjective sleep quality (Pittsburgh Sleep Quality Index), sleep efficiency, sleep time, and melatonin levels in elderly subjects with insomnia. For anxiety, a 2017 systematic review by Boyle et al. in Nutrients found that existing evidence suggests magnesium supplementation may have a beneficial effect on subjective anxiety, though the authors noted methodological limitations in the available studies. The glycinate form is specifically preferred for sleep and relaxation because (1) it is one of the best-absorbed forms, (2) glycine itself promotes relaxation, and (3) it causes significantly less gastrointestinal distress than magnesium citrate or oxide. For people primarily interested in laxative effects or general supplementation at the lowest cost, magnesium citrate or oxide may be preferable, but for sleep, anxiety, and muscle relaxation, glycinate is the evidence-supported choice.
Does It Work? The Evidence
| Claimed Benefit | Evidence Level | Key Studies | Our Verdict |
|---|---|---|---|
| Blood pressure reduction | Strong | Zhang et al. 2016 meta-analysis of 34 RCTs (Hypertension); PMID 27402922. Mean reduction: -2.00/-1.78 mmHg | Works |
| Sleep quality improvement | Moderate | Abbasi et al. 2012 RCT (J Res Med Sci); PMID 23853635. Araújo et al. 2023 systematic review (Nutrients) | Promising |
| Muscle cramp reduction | Moderate | Garrison et al. 2012 Cochrane review (mixed); Roguin Maor et al. 2017 RCT (JAMA Intern Med) - positive in pregnancy cramps | Promising |
| Anxiety and stress reduction | Limited | Boyle et al. 2017 systematic review (Nutrients); PMID 28445426. Suggestive but limited quality evidence. | Promising |
| Migraine prevention | Moderate | American Academy of Neurology 2012 evidence-based guideline: 'probably effective' for migraine prevention at 600mg/day | Promising |
| Type 2 diabetes / glucose metabolism | Moderate | Veronese et al. 2016 meta-analysis of 18 RCTs (Diabetes Care); improved fasting glucose and HOMA-IR in diabetic patients | Promising |
How to Choose: Forms, Doses & What Matters
Clinical dose: 200-400mg elemental magnesium daily (note: magnesium glycinate is ~14% elemental magnesium by weight)
Best forms: magnesium bisglycinate chelate (Albion TRAACS), magnesium glycinate
Take 200-400mg of elemental magnesium (check the Supplement Facts panel for 'elemental magnesium' or 'as magnesium') in the evening, 30-60 minutes before bed if using primarily for sleep. The glycinate form can be taken with or without food and is gentle on the stomach. If taking more than 200mg elemental per dose, consider splitting into two doses (morning and evening). Important label-reading tip: a product listing '1,000mg magnesium glycinate' contains only about 140mg of elemental magnesium. Always look for the elemental amount. Onset of benefits: sleep effects may be noticed within 1-2 weeks, but blood pressure and anxiety benefits typically require 4-8 weeks of consistent daily use.
The Scorecard: 10 Products Compared
Doctor's Best High Absorption Magnesium Glycinate Lysinate
Doctor's BestUses Albion TRAACS - the most research-backed chelated mineral technology. Best combination of quality and value.
Uses Albion TRAACS chelated bisglycinate - a patented chelation process with published bioavailability data
Uses Albion Minerals TRAACS chelate (the gold standard for mineral chelation). GMP facility. Third-party tested but no USP/NSF certification.
$0.13/day at 200mg elemental - excellent value for a chelated magnesium with patented Albion minerals
Full disclosure of elemental magnesium amount. Albion chelate form clearly identified. No proprietary blends.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Nature Made Magnesium Glycinate 200mg
Nature MadeOne of the few USP Verified magnesium glycinate products. The safety and quality assurance justifies the slight price premium.
Magnesium glycinate at 200mg elemental per serving from a USP Verified brand
Nature Made products are USP Verified. This is the #1 pharmacist-recommended magnesium brand.
$0.16/day at 200mg elemental - good value for a USP Verified product
Full disclosure. USP Verified seal on packaging. Form clearly specified. No proprietary blends.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Thorne Magnesium Bisglycinate
ThorneThorne's manufacturing standards are among the highest in the industry. Trusted by Mayo Clinic and numerous sports teams.
Magnesium bisglycinate chelate from a practitioner-trusted brand
NSF Certified for Sport on many Thorne products. Thorne exceeds cGMP standards. Third-party tested by independent labs.
$0.23/day at 200mg elemental - premium but competitive for practitioner-grade quality
Clean label. Minimal excipients. Elemental magnesium amount clearly stated. Form precisely identified.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Pure Encapsulations Magnesium (Glycinate)
Pure EncapsulationsThe gold standard for people with food sensitivities or allergies. Recommended by many integrative medicine practitioners.
Pure magnesium glycinate at a clinical dose per serving
Third-party tested by Eurofins/Silliker. Hypoallergenic - free from gluten, dairy, soy, eggs, peanuts, and all major allergens. GMP+ certified.
$0.33/day at 240mg elemental (2 capsules) - premium pricing reflects hypoallergenic formulation and practitioner-grade standards
Exemplary label transparency. Every excipient listed. Hypoallergenic certification. No fillers, no unnecessary ingredients.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
NOW Foods Magnesium Glycinate
NOW FoodsHard to beat on price-per-serving for magnesium glycinate. NOW Foods is a reliable mid-tier brand.
Magnesium bisglycinate at adequate elemental dose
NPA GMP audited facility. NOW Foods has a strong quality track record. No USP/NSF certification on this product.
$0.09/day at 200mg elemental - among the cheapest magnesium glycinate options available
Good disclosure. Elemental amount clearly stated. Some inactive ingredients (rice flour, gelatin capsule).
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Nested Naturals Magnesium Glycinate
Nested Naturals
Strong value option with a clean label. Popular Amazon choice with positive reviews for sleep support.
Magnesium bisglycinate chelate at 200mg elemental per serving
Third-party tested per brand claims. Vegan capsule. GMP certified facility. No USP/NSF.
$0.10/day at 200mg elemental - very competitive pricing for a chelated glycinate
Clean label with minimal excipients. Elemental amount and chelate form clearly specified. Vegan-friendly capsule.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Life Extension Magnesium Caps 500mg
Life ExtensionHigh elemental magnesium per cap, but the oxide component means lower overall absorption. Best for those wanting a high-dose general magnesium.
Blend of magnesium oxide, citrate, succinate, and TRAACS bisglycinate - provides 500mg elemental per serving
Life Extension uses third-party testing. GMP facility. Not a pure glycinate product - it is a multi-form blend.
$0.12/day at 500mg elemental - good value for the amount, but note this is a blend, not pure glycinate
Discloses all forms used. However, does not specify how much of each magnesium form is in the blend, which limits transparency.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
KAL Magnesium Glycinate 400mg
KAL
High dose per serving but requires swallowing 4 tablets. Good for those who want to reach 400mg elemental from a single product.
High-dose magnesium glycinate - 400mg elemental per serving (4 tablets)
GMP certified. KAL is a Nutraceutix brand. No major third-party certifications visible (no USP, NSF).
$0.12/day at 400mg elemental - strong value, especially for those wanting a higher dose
Elemental amount clearly stated. Form specified. Requires 4 tablets per serving which is a lot. Tablet form, not capsule.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Solgar Magnesium Glycinate
SolgarLegacy brand with 75+ year history. Solid but not exceptional in any single category.
Chelated magnesium glycinate from a legacy supplement brand
Solgar has been in business since 1947. GMP facility. No major third-party certifications visible on this product.
$0.22/day at 200mg elemental - mid-range pricing, competitive but not the cheapest
Good disclosure. Form specified as chelated. Elemental amount clearly stated. No proprietary blends.
Prices checked 2025-03-01. Cost shown is per clinically effective daily dose, not per pill.
Life Extension Neuro-Mag Magnesium L-Threonate
Life ExtensionIncluded 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.
Magnesium L-threonate (Magtein) - a different form designed to cross the blood-brain barrier. One MIT animal study (2010) showed cognitive benefits. Limited human data: one small 2022 RCT in Alzheimer's patients (n=44) showed some benefit.
Uses patented Magtein form. Life Extension's quality standards are above average. Third-party tested.
$0.93/day - significantly more expensive than glycinate forms. The premium is for the Magtein patent, not proven superiority.
Form clearly identified as Magtein (magnesium L-threonate). Elemental magnesium is very low (144mg from 2g Magtein). Label is clear but the low elemental amount surprises some buyers.
Prices checked 2025-03-01. 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 | Thorne Magnesium Bisglycinate Thorne | Pure Encapsulations Magnesium (Glycinate) Pure Encapsulations | NOW Foods Magnesium Glycinate NOW Foods | Nested Naturals Magnesium Glycinate Nested Naturals | Life Extension Magnesium Caps 500mg Life Extension | KAL Magnesium Glycinate 400mg KAL | Solgar Magnesium Glycinate Solgar | Life Extension Neuro-Mag Magnesium L-Threonate Life Extension |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | A- | A- | A- | A- | B+ | B+ | B+ | B+ | B | B- |
| Evidence | B+ | B+ | B+ | B+ | B+ | B+ | B+ | B+ | B+ | B- |
| Quality & Purity | B+ | A | A | A | B | B | B+ | B | B | B+ |
| Value | A | B+ | B | B- | A | A- | B+ | A- | B | D+ |
| Transparency | A | A | A | A+ | B+ | A- | B+ | B+ | B+ | A- |
| Cost/Day | $0.13 | $0.16 | $0.23 | $0.33 | $0.09Winner | $0.10 | $0.12 | $0.12 | $0.22 | $0.93 |
| Dose/Serving | 200mg | 200mg | 200mg | 120mg | 200mg | 200mg | 500mg | 400mg | 200mg | 144mg |
| Form | magnesium bisglycinate chelate (Albion TRAACS) | magnesium glycinate | magnesium bisglycinate chelate | magnesium glycinate | magnesium bisglycinate | magnesium bisglycinate chelate | magnesium oxide, citrate, succinate, bisglycinate chelate blend | magnesium glycinate (ActivTab technology) | magnesium glycinate chelate | magnesium L-threonate (Magtein) |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | ✓ Yes |
| Proprietary Blend | No | No | No | No | No | No | No | No | No | No |
Who Should Take Magnesium Glycinate?
People experiencing poor sleep quality, muscle cramps or tension, stress or anxiety, or those with documented low magnesium intake. Groups at higher risk of deficiency include: older adults (absorption decreases with age), people with type 2 diabetes (urinary excretion increases), those with GI conditions (Crohn's, celiac - reduced absorption), heavy alcohol users, and people on proton pump inhibitors (PPIs) or loop/thiazide diuretics long-term. Athletes may benefit due to magnesium losses in sweat. If your diet is low in magnesium-rich foods (dark leafy greens, nuts, seeds, whole grains, legumes), supplementation is reasonable.
Who Should Avoid It?
People with severe kidney disease (CKD stage 4-5 or eGFR below 30) should consult their nephrologist, as the kidneys are the primary route of magnesium excretion and impaired kidneys can lead to dangerous hypermagnesemia. Those taking certain antibiotics (tetracyclines, fluoroquinolones) should separate magnesium dosing by at least 2-3 hours, as magnesium chelates these drugs and reduces their absorption. People on bisphosphonates (for osteoporosis) should also separate dosing. Caution with concurrent use of muscle relaxants or sedatives, as magnesium may enhance their effects.
Side Effects & Safety
Magnesium glycinate is one of the best-tolerated forms of magnesium. The most common side effect is mild drowsiness (which is a benefit when taking for sleep). At higher doses, some people experience loose stools, though this is much less common with glycinate than with citrate or oxide forms. The Institute of Medicine set the Tolerable Upper Intake Level for supplemental magnesium (not dietary) at 350mg/day for adults, though many practitioners and studies use higher doses safely under monitoring. Signs of excessive magnesium (rare with oral supplementation in people with healthy kidneys) include diarrhea, nausea, and abdominal cramping.
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.
Related Supplements
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.
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.