What magnesium does
Magnesium supports muscle and nerve function, blood sugar regulation, blood pressure, and bone health.
Common forms
Glycinate
Often chosen for calm and sleep; gentle on the stomach.
Citrate
Reasonably absorbed; may also relieve occasional constipation at higher doses.
Oxide
Cheap and common in multivitamins, but absorption is generally lower.
Where it hides in a typical stack
- Multivitamins and bone formulas
- Sleep and "calm" blends
- Electrolyte powders
- Stand-alone glycinate or citrate
When VitaCheck may flag it
If a multivitamin, an electrolyte mix, and a sleep blend all contribute magnesium, totals may push past the widely cited 350 mg/day supplemental upper limit. We mark it “may be redundant” rather than telling you to stop.
Frequently asked questions
Which form of magnesium is best?
It depends on your goal. Glycinate is often chosen for calm and sleep, citrate for occasional constipation relief, and oxide is cheap but poorly absorbed. There is no single “best” form for everyone.
How much magnesium per day?
General reference intakes for adults are around 310–420 mg/day from all sources. A widely cited upper limit for supplemental magnesium (separate from food) sits around 350 mg/day for adults, since higher supplemental doses can cause loose stools.
Does magnesium interact with anything?
Magnesium can interact with certain antibiotics, thyroid medication, and bisphosphonates, often by reducing absorption when taken together. Spacing doses or checking with a pharmacist is sensible.