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Magnesium Glycinate (Bisglycinate)

Evidence Level
Moderate
2 Clinical Trials
5 Documented Benefits
3/5 Evidence Score

Magnesium glycinate (also called magnesium bisglycinate) is magnesium chelated with two glycine molecules — among the most bioavailable and best-tolerated forms. Distinguished by minimal laxative effect (vs citrate/oxide), making it the preferred form for those needing higher doses or with sensitive GI tracts. Particularly popular for sleep, anxiety, and stress applications — the glycine component itself supports calming effects on the CNS.

Studied Dose 200–400 mg elemental magnesium/day; for sleep typically 200–300 mg 30–60 min before bed
Active Compound Magnesium glycinate / bisglycinate (chelate)

Benefits

Sleep Quality and Stress

Magnesium glycinate is widely used for sleep and anxiety — combining magnesium's NMDA receptor antagonism and GABA modulation with glycine's independent inhibitory neurotransmitter effects. Glycine supplementation alone (3 g) has been shown to improve sleep quality; the chelate provides both.

Supported by Trial 2

Superior GI Tolerability

Unlike magnesium citrate or oxide (which cause loose stools/diarrhea via osmotic effect), magnesium glycinate is gentle on the GI tract. Allows higher cumulative dosing without bowel disruption — particularly valuable for those needing to correct deficiency.

Supported by Trial 1, Trial 2

Muscle Cramps and Recovery

Magnesium is critical for neuromuscular function and ATP production. Glycinate form provides bioavailable magnesium without GI distress that could disrupt training/recovery routines.

Supported by Trial 2

Anxiety Reduction

Some evidence suggests magnesium supplementation modestly reduces anxiety symptoms — particularly in deficient populations. systematic review showed potential benefit; effect sizes modest.

Supported by Trial 2

Migraine Prevention (Adjunct)

Magnesium (any form) is supported by AHS/AAN as Level B evidence for migraine prevention. Glycinate form preferred for chronic daily dosing due to GI tolerability.

Supported by Trial 2, Trial 1

Mechanism of action

1

Glycine Chelate Stability

Bisglycinate structure protects magnesium from gastric pH changes and competing absorption inhibitors (phytates, oxalates, calcium). Chelation is thought to allow absorption via dipeptide transporters in addition to standard mineral transport pathways.

2

NMDA Receptor Antagonism

Magnesium gates NMDA glutamate receptors — provides inhibitory tone in the CNS. May contribute to anxiolytic and sleep-promoting effects.

3

Glycine Inhibitory Neurotransmission

Glycine itself is an inhibitory CNS neurotransmitter (acts on glycine receptors and as NMDA co-agonist at glycine site). Provides additive calming effects beyond magnesium alone.

4

Reduced Osmotic GI Effect

Unlike highly water-soluble magnesium salts (citrate, oxide), the chelate does not pull water osmotically into the bowel — eliminating the laxative effect that limits other forms.

Clinical trials

1
Magnesium Bisglycinate Bioavailability — Crossover Clinical Trial

Randomized crossover trial comparing oral magnesium bisglycinate vs magnesium oxide vs placebo in healthy adults. Outcomes: serum magnesium, red blood cell magnesium, urinary excretion. (Multiple PK trials)

Healthy adults.

Magnesium bisglycinate produced higher serum/RBC magnesium AUC vs oxide. Better GI tolerability (less laxative effect). Industry-funded research dominates this space. Note: 2024 Natural Calm trial (NCT03353636) compared magnesium carbonate vs bisglycinate vs citrate — manufacturer-sponsored.

2
Magnesium for Anxiety

Evidence review of 18 studies examining magnesium supplementation effects on subjective anxiety. Various magnesium forms included.

Pooled across anxiety clinical trials.

Magnesium modestly reduced anxiety symptoms vs placebo, particularly in anxious populations. Effect sizes modest. Critical caveat: study quality variable; not specific to glycinate form. Standard anxiety care (SSRIs, CBT) remains foundational.

Side effects and drug interactions

Common Potential side effects

Generally very well-tolerated — minimal GI effects vs other magnesium forms.
Drowsiness if taken in daytime (glycine + magnesium combination is calming).
Hypotension at very high doses (>600 mg elemental).
Rare allergic reactions to glycine component.

Important Drug interactions

Bisphosphonates (alendronate, risedronate) — magnesium binds and reduces absorption; separate by 2 hours.
Tetracycline/quinolone antibiotics — chelation reduces antibiotic absorption; separate by 2 hours.
Levothyroxine — reduces absorption; separate by 4 hours.
Diuretics (loop, thiazide) — increase magnesium loss; supplemental magnesium may correct this.
Proton pump inhibitors (long-term) — cause magnesium deficiency; supplementation appropriate.

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Frequently asked questions about Magnesium Glycinate (Bisglycinate)

How much magnesium glycinate should I take?

Supplements typically provide 100 to 200 mg of elemental magnesium per dose, with a common daily target around 200 to 400 mg of elemental magnesium. Check the label carefully, since elemental magnesium content is lower than the total compound weight.

Why choose magnesium glycinate over other forms?

Magnesium glycinate (magnesium bound to the amino acid glycine) is well absorbed and gentle on the stomach, making it much less likely to cause the laxative effect seen with magnesium oxide or citrate. It is a popular choice for sleep, relaxation, and daily use.

When should I take magnesium glycinate?

Many people take it in the evening because the glycine component is calming and it may support relaxation and sleep. That said, it can be taken any time, and splitting the dose between morning and night is fine. Take it with or without food.

Is magnesium glycinate good for sleep and relaxation?

It is a popular choice, combining well-absorbed magnesium that supports nervous-system relaxation with glycine, which is itself studied for sleep. Many people find it calming before bed, though it is best seen as gentle support rather than a treatment for diagnosed anxiety or insomnia.

What is Magnesium Glycinate?

Magnesium glycinate (also called magnesium bisglycinate) is magnesium chelated with two glycine molecules — among the most bioavailable and best-tolerated forms. Distinguished by minimal laxative effect (vs citrate/oxide), making it the preferred form for those needing higher doses or with sensitive GI tracts.

What is Magnesium Glycinate used for?

Magnesium Glycinate is researched primarily for Sleep Health, Stress & Anxiety, and Muscle & Recovery. Magnesium glycinate is widely used for sleep and anxiety — combining magnesium's NMDA receptor antagonism and GABA modulation with glycine's independent inhibitory neurotransmitter effects.

What is the recommended dosage of Magnesium Glycinate?

The clinically studied dose is 200–400 mg elemental magnesium/day; for sleep typically 200–300 mg 30–60 min before bed Always follow the product label and check with a healthcare provider for personal advice.

Is Magnesium Glycinate safe, and does it have side effects?

For most healthy adults, Magnesium Glycinate is well tolerated at studied doses. Reported effects can include: Generally very well-tolerated — minimal GI effects vs other magnesium forms. Drowsiness if taken in daytime (glycine + magnesium combination is calming). It may also interact with some medications. Magnesium Glycinate is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Magnesium Glycinate interact with any medications?

Possible interactions include: Bisphosphonates (alendronate, risedronate) — magnesium binds and reduces absorption; separate by 2 hours. Tetracycline/quinolone antibiotics — chelation reduces antibiotic absorption; separate by 2 hours. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Magnesium Glycinate?

NutraSmarts rates the evidence for Magnesium Glycinate as Moderate (3 out of 5). It is backed by 2 clinical trials and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Zhang X, Li Y, Del Gobbo LC, Rosanoff A, Wang J. Effects of Magnesium Supplementation on Blood Pressure: A Meta-Analysis of Randomized Double-Blind Placebo-Controlled Trials. Hypertension. 2016;68(2):324-33..PubMedUsed to support: Meta-analysis of magnesium supplementation on blood pressure (magnesium glycinate is a magnesium form).