Magnesium — Stack & Timing
Educational timing and stacking information based on how Magnesium has been studied. Not a prescription. Not medical advice.
This is educational information only, not medical advice. Supplement needs vary by individual, health status, and existing dietary intake. Consult a healthcare provider before starting any supplement regimen.
Stack & Timing Guidance
Educational summary based on how Magnesium has been studied and commonly used.
Commonly studied timing
Most commonly studied and used in the evening, 30–60 minutes before sleep. Taking with food may reduce GI discomfort. Magnesium malate is sometimes used during the day for energy-related purposes, based on mechanistic reasoning rather than strong clinical trial data.
Dose ranges used in studies
Studies have used a wide range. The supplemental Tolerable Upper Intake Level (UL) set by the National Academies is 350 mg/day from non-food sources. Many products list total salt weight — check for elemental magnesium content. Forms vary in bioavailability.
↑ These are ranges from research studies, not personal dosing recommendations. Discuss with a clinician.
Commonly paired with
Both studied in relation to sleep quality and relaxation. Some users combine them in an evening stack. No direct interaction studies.
Note: Combination not directly studied in RCTs; based on individual mechanism evidence.
Glycine has separate sleep evidence (reduces core body temperature). Sometimes combined with magnesium in sleep stacks.
Note: Glycine sleep evidence is moderate; combination not directly tested.
Different mechanism (circadian rhythm vs. GABA/NMDA modulation). Some practitioners use both for sleep, though combination evidence is limited.
Note: No head-to-head RCT of combined magnesium + melatonin.
Safety & interactions
Generally well-tolerated. GI upset (diarrhea, loose stool) is the most common side effect, more common with oxide and citrate forms than glycinate or threonate. Excess magnesium can be excreted renally in healthy individuals, but those with impaired kidney function should be cautious. Not recommended as a substitute for sleep hygiene, therapy, or medical treatment.
- •Bisphosphonates (e.g., alendronate): Magnesium may reduce absorption — separate by at least 2 hours
- •Quinolone and tetracycline antibiotics: May bind magnesium and reduce antibiotic absorption
- •Diabetes medications: Magnesium may influence glucose regulation — monitor if diabetic
- •Diuretics: Some increase or decrease magnesium excretion
- •Proton pump inhibitors (long-term): Associated with magnesium depletion
Individuals with severe kidney disease (eGFR <30) should not supplement without medical supervision. Hypermagnesemia is rare but serious in renal impairment.