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Magnesium Glycinate
Magnesium glycinate is the best form of magnesium 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
- 9 of 10 products
- Category
- Vitamins & Minerals
- Best form
- magnesium bisglycinate chelate (Albion TRAACS)
- Effective dose
- 200-400mg elemental magnesium daily
- Lab tested
- 9 of 10 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.
- →NOW Foods ($0.09/day) is the budget pick; Doctor's Best with Albion TRAACS chelate ($0.13/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?
Magnesium glycinate is the best form of magnesium for most people. If your goal is sleep quality or reducing anxiety, this is the one to buy, glycinate absorbs significantly better than cheap oxide, and the glycine component independently improves sleep as an inhibitory neurotransmitter. Half the US population falls below the RDA anyway, so supplementation is defensible for most.
Why glycinate? It reaches significantly higher blood levels than cheap magnesium oxide at the same dose. The glycine component is also calming on its own - it acts as an inhibitory neurotransmitter and independently improves sleep quality. So the form does double duty.
The blood pressure data is strong. Reviews of over 30 trials show magnesium at roughly 350-400mg/day consistently reduces blood pressure by about 2/2 mmHg. Not dramatic, but clinically meaningful for borderline hypertension. For sleep, studies show 500mg daily significantly improves sleep quality and melatonin levels in older adults with insomnia. The anxiety evidence is weaker and less consistent.
If you want the calming and sleep benefits, glycinate is the right form. If you want a laxative effect or just the cheapest option, citrate or oxide work. For sleep, anxiety, and muscle relaxation, glycinate has the evidence.
Does It Work? The Evidence
How A-F grades workBlood 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
Anxiety and stress reduction
Boyle et al. 2017 systematic review (Nutrients); PMID 28445426. Suggestive but limited quality evidence.
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
| 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 |
| C | Anxiety and stress reduction | Boyle et al. 2017 systematic review (Nutrients); PMID 28445426. Suggestive but limited quality evidence. | 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 |
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
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.
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?
Not for everyone
Side Effects & Safety
Product Scores
10 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 10 Products Compared
Doctor's Best High Absorption Magnesium Glycinate Lysinate
Doctor's Best$15.64 ÷ 120 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 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
Nature Made Magnesium Glycinate 200mg
Nature Made$9.47 ÷ 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 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
Thorne Magnesium Bisglycinate
Thorne$14.00 ÷ 61 days at 200mg/day (1 serving × 200mg)
Thorne's manufacturing standards are among the highest in the industry. Trusted by Mayo Clinic and numerous sports teams.
Prices checked 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
Nested Naturals Magnesium Glycinate
Nested Naturals
$11.95 ÷ 119 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 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
NOW Foods Magnesium Glycinate
NOW Foods$16.27 ÷ 181 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 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
KAL Magnesium Glycinate 400mg
KAL
$20.99 ÷ 175 days at ~206mg/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 2026-03-01. Cost shown is per clinically effective daily dose, not per pill.
Life Extension Magnesium Caps 500mg
Life Extension$11.25 ÷ 94 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 2026-03-01. 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.
Pure Encapsulations Magnesium (Glycinate)
Pure Encapsulations$29.60 ÷ 90 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 2026-03-01. 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 | Thorne Magnesium Bisglycinate Thorne | Nested Naturals Magnesium Glycinate Nested Naturals | NOW Foods Magnesium Glycinate NOW Foods | KAL Magnesium Glycinate 400mg KAL | Life Extension Magnesium Caps 500mg Life Extension | Solgar Magnesium Glycinate Solgar | Pure Encapsulations Magnesium (Glycinate) Pure Encapsulations | Life Extension Neuro-Mag Magnesium L-Threonate Life Extension |
|---|---|---|---|---|---|---|---|---|---|---|
| Brand Score | 91/100Winner | 91/100 | 90/100 | 88/100 | 87/100 | 86/100 | 85/100 | 83/100 | 83/100 | 69/100 |
| Dosing & Form | 25/25Winner | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 18/25 | 18/25 |
| Purity | 20/25 | 23/25Winner | 23/25 | 19/25 | 19/25 | 19/25 | 20/25 | 19/25 | 23/25 | 20/25 |
| Value | 23/25Winner | 20/25 | 19/25 | 22/25 | 23/25 | 22/25 | 20/25 | 19/25 | 17/25 | 9/25 |
| Transparency | 23/25 | 23/25 | 23/25 | 22/25 | 20/25 | 20/25 | 20/25 | 20/25 | 25/25Winner | 22/25 |
| Cost/Day | $0.13 | $0.16 | $0.23 | $0.10 | $0.09Winner | $0.12 | $0.12 | $0.22 | $0.33 | $0.93 |
| Dose/Serving | 200mg | 200mg | 200mg | 200mg | 200mg | 400mg | 500mg | 200mg | 120mg | 144mg |
| Form | magnesium bisglycinate chelate (Albion TRAACS) | magnesium glycinate | magnesium bisglycinate chelate | magnesium bisglycinate chelate | magnesium bisglycinate | magnesium glycinate (ActivTab technology) | magnesium oxide, citrate, succinate, bisglycinate chelate blend | magnesium glycinate chelate | magnesium glycinate | magnesium L-threonate (Magtein) |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes |
| Proprietary Blend | 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.
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.
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.