Magnesium glycinate
TL;DR
Highly bioavailable form of magnesium bound to the amino acid glycine
High evidence for improving sleep quality and reducing anxiety
Moderate evidence for reducing muscle cramps and PMS symptoms
Gentlest on the stomach; unlikely to cause the laxative effect of other forms
Affordable: ~$10-15/month
Best for: Insomnia, anxiety, muscle relaxation
What it is
Magnesium is a 'master mineral' involved in over 300 biochemical reactions. Magnesium Glycinate is a chelated form, meaning the magnesium is bonded to glycine. This makes it highly stable and much easier for the gut to absorb than magnesium oxide or citrate. Because glycine is itself an inhibitory (calming) neurotransmitter, this specific form is particularly effective for relaxation and mental health.
What the research says
US Army studies on noise-induced hearing loss prevention. Magnesium deficiency linked to increased tinnitus severity. Mechanism: cochlear vasodilation and NMDA receptor modulation.
Magnesium is essential for the function of the GABA system, the brain's 'off switch.' Evidence. A 2012 study in the Journal of Research in Medical Sciences found that magnesium supplementation significantly improved sleep time, sleep efficiency, and melatonin concentration in elderly insomniacs. Mechanism. It helps lower cortisol and binds to GABA receptors, calming the central nervous system.
Meta-analyses show benefit for insulin sensitivity, blood pressure, and fasting glucose. Deficiency is common in metabolic syndrome.
Multiple meta-analyses show blood pressure reduction of 2-4 mmHg. Inversely associated with cardiovascular mortality in observational studies.
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Safety
Extremely safe. The most common side effect is mild drowsiness. People with severe kidney disease should consult a doctor, as the kidneys are responsible for magnesium excretion.
Interactions
- Antibiotics: Can interfere with the absorption of Tetracyclines and Quinolones.
- Osteoporosis Drugs: May reduce absorption of Bisphosphonates.
Dosing
Standard Dose: 200-400 mg of elemental magnesium daily. Timing: 30-60 minutes before bed for sleep. Form: Ensure the label says 'fully reacted' glycinate to avoid cheap magnesium oxide blends.
Cost
Affordable. Typically $10-15 per month.
The bottom line
The 'Gold Standard' of magnesium for most people. It's the best choice for sleep and stress without the bathroom-related side effects of cheaper forms.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.