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Magnesium Glycinate

This form of magnesium is frequently chosen for its potential to support relaxation and sleep due to good absorption.

Evidence · Grade DSafety · Generally safe
Human trial evidenceTraditional useInteraction riskNeeds more research

Highly bioavailable form of magnesium widely recommended for sleep, anxiety, migraines, muscle tension, and MS-related spasticity.

Magnesium glycinate is a chelated form of magnesium, meaning magnesium is bound to the amino acid glycine. This form is often chosen for its purported higher bioavailability and gentler effect on the digestive system compared to other magnesium forms. It is commonly used as a dietary supplement by individuals seeking to support various physiological functions, including muscle relaxation, sleep quality, and stress management. People typically take it in capsule, tablet, or powder form, often in divided doses throughout the day.

Quick answer

What it is: Magnesium glycinate is a chelated form of magnesium, meaning magnesium is bound to the amino acid glycine.

May support:Multiple Sclerosis (MS), Estrogen Dominance, Celiac Disease, Migraine, Metabolic Syndrome, Insomnia, Anxiety, Headache, Hypertension, Prediabetes, Chronic Back Pain, Carpal Tunnel Syndrome, Chronic Stress, Bipolar Disorder, OCD, Insulin Resistance, PMDD, Irritable Bowel Syndrome, Seasonal Affective Disorder, Endometriosis, Plantar Fasciitis, Gout, Diverticulitis, Hashimoto's Thyroiditis, PMS, Interstitial Cystitis, Heart Failure, Obesity, Gastroparesis, Psoriasis, Sleep Apnea, Lyme Disease, Vitamin B12 Deficiency, Anxiety Disorder, Acid Reflux (GERD), Psoriatic Arthritis, Chronic Constipation, Autoimmune Thyroid Disease, Perimenopause, Tendinitis, Restless Leg Syndrome, Vitamin D Deficiency, Herniated Disc, Osteoporosis, Menstrual Cramps, Menopause, Multiple Sclerosis, Asthma, Low Libido, Rheumatoid Arthritis, Chronic Fatigue, High Blood Pressure, Hyperthyroidism, Burnout, PTSD, Sciatica, Type 1 Diabetes, Type 2 Diabetes, GERD, Brain Fog, ADHD, Atherosclerosis, Panic Disorder, PCOS, Ankylosing Spondylitis, COPD, Chronic Fatigue Syndrome, Adrenal Fatigue, Atrial Fibrillation, Omega-3 Deficiency, Graves' Disease, Depression, Bloating, Mold Illness / CIRS, Magnesium Deficiency, Constipation, Fibromyalgia

Evidence:Evidence · Grade D

Safety:Safety · Generally safe

Evidence Summary

Evidence · Grade D

Current evidence for magnesium glycinate specifically is largely based on preclinical studies, anecdotal reports, and general research on magnesium's physiological roles. While magnesium is well-studied, specific robust clinical trials on magnesium glycinate for distinct health outcomes are less common, contributing to a lower evidence grade.

Last reviewed · Jun 2026

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Why It Works

Magnesium glycinate appears to work primarily by supplying magnesium, a vital mineral involved in numerous bodily processes. The glycine component may also contribute to its calming effects by interacting with neurotransmitter systems.

How it works in more detail

Magnesium acts as a cofactor for over 300 enzymatic reactions in the body, which include energy production, protein synthesis, and nerve signal transmission. It appears to modulate NMDA receptors, which are involved in excitatory neurotransmission, and may enhance GABAergic tone, a primary inhibitory neurotransmitter, potentially leading to a calming effect on the nervous system. The amino acid glycine itself is an inhibitory neurotransmitter in the central nervous system, which may further contribute to the calm-promoting properties often associated with this supplement.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
300–600 mg/day elemental magnesium, preferably in the evening.
Research dosage range
200–400 mg/day elemental magnesium
Typical onset
Some individuals report experiencing acute effects, such as muscle relaxation or improved sleep, within hours of initial use. For more systemic benefits related to magnesium repletion, consistent daily use over several weeks may be necessary to observe more pronounced effects.
Typical forms
capsule, powder, tablet
Quality markers
For a quality magnesium glycinate product, look for third-party testing certifications to ensure purity and potency, verifying the absence of contaminants. Reputable brands often disclose the amount of elemental magnesium per dose rather than just the total magnesium glycinate compound. Products should preferably be free from unnecessary fillers, artificial colors, or common allergens.
Medication interactions
  • Antibiotics (tetracyclines and quinolones)
  • Diuretics (potassium-sparing)
  • Bisphosphonates
  • Proton pump inhibitors (long-term use)
Avoid if
  • Severe kidney disease
  • Bowel obstruction
Pregnancy / lactation
Magnesium intake from supplements during pregnancy and lactation should stay within the Tolerable Upper Intake Level for supplemental magnesium (350 mg/day of elemental magnesium for adults, including pregnant and lactating people 19+). Magnesium glycinate is generally considered low risk at typical doses, but pregnant or breastfeeding individuals should consult a clinician before starting, especially if they take other supplements or have kidney concerns.

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Suggested dosage

300–600 mg/day elemental magnesium, preferably in the evening.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Magnesium bisglycinate (magnesium chelated to glycine).

Traditional use

Magnesium-rich diets have long been recognized as calming; glycinate is a modern, gentle, well-absorbed form.

Safety

Safety warnings

High doses can cause loose stools. Caution in kidney disease.

Avoid if

  • Severe kidney disease
  • Bowel obstruction

Medication interactions

  • Antibiotics (tetracyclines and quinolones)
  • Diuretics (potassium-sparing)
  • Bisphosphonates
  • Proton pump inhibitors (long-term use)

Reported side effects

  • Diarrhea
  • Nausea
  • Abdominal cramping
  • Loose stools

Pregnancy & lactation

Magnesium intake from supplements during pregnancy and lactation should stay within the Tolerable Upper Intake Level for supplemental magnesium (350 mg/day of elemental magnesium for adults, including pregnant and lactating people 19+). Magnesium glycinate is generally considered low risk at typical doses, but pregnant or breastfeeding individuals should consult a clinician before starting, especially if they take other supplements or have kidney concerns.

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade (D)

Current evidence for magnesium glycinate specifically is largely based on preclinical studies, anecdotal reports, and general research on magnesium's physiological roles. While magnesium is well-studied, specific robust clinical trials on magnesium glycinate for distinct health outcomes are less common, contributing to a lower evidence grade.

Filter by source type

Clinical Guidelines(1)

Recommendations from medical societies (NICE, AHA, ADA, ACG, Endocrine Society…).

High Quality

  • Hormone Health Network

    The Endocrine Society

    While the Endocrine Society provides comprehensive resources on hormonal health, specific guidelines on magnesium glycinate for estrogen dominance are not readily available.

    Clinical GuidelineThe Endocrine SocietyHigh Quality

Randomized Human Trials(1)

Controlled human studies with random assignment.

High Quality

  • Combined vitamin D and magnesium supplementation does not influence markers of bone turnover or glycemic control: A randomized controlled clinical trial.

    Dall RD, Cheung MM, Shewokis PA, Altasan A, Volpe SL, Amori R · Nutrition research (New York, N.Y.) · 2023 · n=78

    High-dose vitamin D supplementation can increase total osteocalcin concentrations that may reduce insulin resistance in individuals at risk for prediabetes or diabetes mellitus. Magnesium is a cofactor in vitamin D metabolism and activation. The purpose of this study was to determine the combined effect of vitamin D and magnesium supplementation on total osteocalcin concentrations, glycemic indices, and other bone turnover markers after a 12-week intervention in individuals who were overweight and obese, but otherwise healthy. We hypothesized that combined supplementation would improve serum total osteocalcin concentrations and glycemic indices more than vitamin D supplementation alone or a placebo. A total of 78 women and men completed this intervention in 3 groups: a vitamin D and magnesium group (1000 IU vitamin D3 and 360 mg magnesium glycinate), a vitamin D group (1000 IU vitamin D3), and a placebo group. Despite a significant increase in serum 25-hydroxyvitamin D concentrations i

    Randomized TrialPubMedHigh Quality

Animal Studies(1)

Preclinical animal research — not a substitute for human evidence.

Low Quality

  • Effect of chronic administration of magnesium supplement (magnesium glycinate) on male albino wistar rats' intestinal (Ileum) motility, body weight changes, food and water intake.

    Aniebo Umoh E, Obembe AO, Ikpi DE, Ekpenyong Eniang-Esien O, Okon Asuquo J, Effiom-Ekaha OO · Heliyon · 2023 · n=19

    Recent researches suggests magnesium as an adjuvant medication for COVID 19 patients. Magnesium relaxes skeletal muscles, an effect when prolonged in intestinal smooth muscles can cause severe discomfort such as bloating, vomiting, constipation and nausea. The objectives of this study was to ascertain if magnesium will cause relaxation of the intestinal (ileum) smooth muscles as it does in skeletal muscles. Also, this research seeks to find out the receptor pathway through which magnesium will alter motility in the gut using acetylcholine, atropine and propranolol. Ten male albino wistar rats (100-150 g) were randomly assigned into two groups (control and magnesium treated) (n = 5). Animals were acclimatized for two weeks before treatment which lasted for 6 weeks. Magnesium treated animals received oral magnesium glycinate (1600 mg/70 kg) daily while control group receive normal saline of equal volume. All animals had free access to food and water ad libitum. Result

    Animal StudyPubMedLow Quality

Clinical Trial Registries(6)

Registered ongoing or completed trials (ClinicalTrials.gov).

Moderate Quality

  • Comparative Efficacy of Magnesium Supplement and Melatonin Congener in Young Adults With Primary Insomnia

    n=60 · NCT06996171 · RECRUITING · RECRUITING

    Sleep is essential for our overall health and well-being, much like food and water. It plays a vital role in numerous bodily functions. Many studies have been conducted to determine the efficacy of melatonin congeners and Mg supplements in patients with insomnia separately. This study aims to compare the efficacy of melatonin and magnesium supplements in young adults with primary insomnia. Most insomnia studies focus on older adults or individuals with comorbidities. Targeting otherwise healthy young adults brings age-specific relevance and novel insight.

    Clinical TrialClinicalTrials.govModerate Quality

  • Methylomic Biomarkers, Magnesium Deficiency and Colon Neoplasia Prevention

    n=250 · NCT04196803 · COMPLETED · COMPLETED

    Based on the magnesium tolerance test (MTT, "gold standard" for assessing magnesium (Mg) status), it was found that over 50% of participants in the US exhibited Mg deficiency. Studies suggest that the relationship between high Mg intake and disease risks may be varied by an individual's Mg status. Despite its importance, MTT is not commonly employed in routine clinical practice or research studies. Instead, serum Mg levels are typically used for clinical diagnosis, although this method has shown limited efficacy in identifying Mg deficiency accurately. Consequently, there is a pressing need to develop practical, sensitive, and specific biomarkers that can efficiently identify individuals with Mg deficiency. It is known that DNA methylation changes are inducible by environmental exposures, including nutrients, and reversible when the exposure disappears. There are two major types of DNA methylation modifications, 5-hydroxymethylcytosine (5-hmC) and 5-methylcytosine (5-mC). 5-mC is often associated with suppressed gene expression. 5-hmC, generated by the oxidation of 5-mC, is specifically enriched in expressed genes and play a critical role in activating and/or maintaining gene expression. We plan identify 5-hmC and 5-mC for Mg deficiency by a 4- phase comprehensive epigenome-wide association study (EWAS) using the samples collected in the "Personalized Prevention of Colorectal Cancer Trial \[PPCCT, R01CA149633; PI, Dai \& Yu\]" . The parent trial \[NCT04196023\] that supports this ancillary research is a randomized controlled trial to evaluate the efficacy of reducing the Ca:Mg ratio among those who consume high Ca:Mg ratio diets to decrease the risk of colorectal cancer. For this ancillary trial research, the investigators are examining ancillary measures of Changes of Cytosine Modification in TMPRSS2.

    Clinical TrialClinicalTrials.govModerate Quality

  • Impact of Long-term Serum Magnesium and Potassium Levels Optimization and Multifactorial Adherence Intervention on the Progression of Diabetic Kidney Disease.

    n=160 · NCT04942119 · UNKNOWN · UNKNOWN

    Insufficient clinical evidence correlates the progression of diabetic kidney disease with electrolyte homeostasis in patients diagnosed with type 2 diabetes mellitus (T2DM), especially in the United Arab Emirates (UAE) population and what are the most effective interventions to slow chronic renal failure progression. In our research, we test the hypothesis that low serum magnesium and potassium levels are directly associated with the decline of kidney function in diabetic patients who did not have severely impaired renal function at baseline. In addition, we describe the effect of long-term multifactorial adherence interventions on medication adherence, diet adherence and follow-up visits using a telemedicine approach such as mobile applications in reducing the progression of chronic kidney disease and other diabetes-related complications. This study is a single-blind randomized control trial to demonstrate the causal relationship between potassium and magnesium levels and estimated glomerular filtration rate (eGFR) decline. The intervention group will be evaluated for manifestations of electrolyte imbalance and correction of serum magnesium and/or potassium levels will be initiated based on the last updated laboratory test. Moreover, they will receive education to reinforce diet and exercise changes at each follow up visit by a specialized dietitian with pharmacist-led comprehensive medication therapy management utilizing multifactorial adherence interventions to measure potential drug-drug or drug-food interactions, as well as medication and follow-up adherence through an integrated mobile application and fixed medication possession ratio (FMPR). This research is under progress, and summary of its findings will be reported. This study will suggest if additional national monitoring guidelines may be warranted. In addition, it will reduce diabetic burden, medication cost in UAE and improve patient satisfaction by reducing or delaying the progression of diabetic kidney disease in diabetic patients.

    Clinical TrialClinicalTrials.govModerate Quality

Evidence Summaries(3)

Curated cross-source summaries (TRIP Database and similar).

High Quality

  • Magnesium Glycinate

    Natural Medicines Database

    The Natural Medicines Database offers comprehensive, evidence-based information on dietary supplements and natural medicines, including magnesium glycinate, assessing its efficacy for various conditions.

    Evidence SummaryNatural Medicines DatabaseHigh Quality

  • Magnesium

    Natural Medicines Database

    The Natural Medicines Database offers a detailed professional monograph on magnesium, including its uses for various conditions like migraine, efficacy ratings, dosing, and safety information based on scientific evidence.

    Evidence SummaryNatural Medicines DatabaseHigh Quality

  • Magnesium in the treatment of migraine

    Cochrane

    This Cochrane review assesses the efficacy and safety of magnesium for the treatment of migraine attacks and the prophylactic treatment of migraine.

    Evidence SummaryCochraneHigh Quality

Limitations: Limitations include a general lack of high-quality, large-scale human clinical trials specifically on magnesium glycinate, particularly randomized controlled trials. Many studies that do exist are small, may not be blinded, or focus on general magnesium supplementation rather than this specific form, making it difficult to attribute effects solely to magnesium glycinate.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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