Magnesium Glycinate
Calms the nervous system and supports deeper sleep.
- Typical dose
- 300–400 mg
- When to take
- Evening
- Onset
- Sleep benefits often felt within 1–3 nights; muscle cramp relief within a week
What it does
Benefits
- Promotes parasympathetic (rest-and-digest) nervous system activity
- Supports deeper, more restorative sleep
- Relaxes muscles — helps with cramps and tension
- Cofactor in 300+ enzyme reactions including ATP production
The science
How it works
Magnesium is a natural NMDA receptor antagonist and GABA agonist — it calms excitatory neurotransmission. Glycinate (bound to the amino acid glycine) is gentle on the gut and crosses the blood-brain barrier well.
Getting it right
Dose & timing
Dose guidance
300–400 mg elemental magnesium in the evening. Note: a '500 mg magnesium glycinate' capsule contains only ~100 mg elemental magnesium — check the label.
Best time to take
30–60 minutes before bed. Split the dose if you get loose stools.
Is it for you?
Who should (and shouldn't) take it
Good for
- Poor sleep or frequent waking
- Muscle cramps or restless legs
- High-stress periods
- Heavy training (magnesium is lost in sweat)
Skip or ask a doctor if
- Kidney disease (talk to your doctor)
- You take bisphosphonates or certain antibiotics (separate by 2+ hours)
- You have low blood pressure and bradycardia
Know before you start
Side effects & safety
- Loose stools (more common with oxide or citrate)
- Mild drowsiness
- Rare: low blood pressure at high doses
Shopping guide
Forms & what to look for
- Glycinate (bisglycinate)
Best for sleep and anxiety; gentle on gut
- Citrate
Good absorption but laxative effect
- Malate
Energy and muscle recovery
- Oxide
Poorly absorbed — skip unless you need a laxative
- Threonate
Crosses blood-brain barrier well; pricier
Combining
Stacks well with / avoid pairing
Stacks well with
Common questions
FAQ
Why not just use magnesium citrate?
Citrate is fine but more likely to cause loose stools. Glycinate is better tolerated for nightly use.
Can I take it every night long-term?
Yes — magnesium is an essential mineral, not a drug. Most Americans under-consume it.
Morning or evening?
Evening is standard for sleep and recovery. Morning works if you just want general supplementation.
References
Sources & further reading
Educational only, not medical advice. Check with a clinician before starting anything new, especially if you're on medication or pregnant.
Other supplements
Appears in
Featured stacks with Magnesium Glycinate
The Sleep Reset Stack
Fall asleep faster, stay asleep longer, wake up actually rested.
See the stack →The Stress Less Stack
Dial down cortisol, steady your nervous system, stop feeling frayed.
See the stack →The Longevity Foundations Stack
The five supplements with the strongest evidence for a longer healthspan.
See the stack →