Magnesium glycinate (also called magnesium bisglycinate) is a dietary supplement in which magnesium is bound to the amino acid glycine. This chelated form is thought to be more readily absorbed and gentler on the stomach than some other magnesium salts.
What it’s commonly used for
- Correcting magnesium deficiency
- May be easier on the gut than some other forms (less likely to cause diarrhea)
- Some people use it for sleep support, anxiety, or muscle cramps (evidence for these uses varies)
Typical dosing notes
- Check the label for how much elemental magnesium you’re getting per dose. A product might provide around 100–200 mg of elemental magnesium per capsule or tablet, with some brands offering higher amounts per dose.
- Common practical range: about 200–400 mg of elemental magnesium per day, taken in one or two divided doses.
- Start low and increase as tolerated. Taking with food can help absorption and reduce stomach upset.
- Do not rely on magnesium glycinate alone to meet total daily magnesium needs if you have a deficiency or certain health conditions; diet and other sources count too.
Safety and who should avoid or use caution
- Generally well tolerated, but high doses can cause diarrhea, nausea, or abdominal cramping.
- People with kidney disease or reduced kidney function should avoid high-dose magnesium supplements unless advised by a clinician.
- If you take medications that affect or are affected by magnesium (see interactions below), adjust timing or dose under medical supervision.
- Pregnancy and breastfeeding: consult your healthcare provider before starting any supplement.
- Seek medical advice if you have symptoms of magnesium toxicity (confusion, slowed/irregular heart rhythm, extreme sleepiness, trouble breathing).
Drug interactions and timing
- Antibiotics such as tetracyclines and fluoroquinolones: separate dosing by a couple of hours because magnesium can reduce antibiotic absorption.
- Other minerals (calcium, zinc, iron) can compete with magnesium for absorption; space doses apart if you take multiple minerals.
- Some medications (e.g., bisphosphonates, certain thyroid meds) may require timing adjustments.
- If you take laxatives or other magnesium-containing products, total daily magnesium intake can add up quickly; monitor total.
How to choose and what to look for on the label
- Look for the amount of elemental magnesium per serving (not just the total compound weight).
- Check that it’s labeled as magnesium glycinate or magnesium bisglycinate; this indicates the chelated form.
- Read the other ingredients if you have allergies or sensitivities.
- Consider whether you want a product that is non-GMO, vegan, scent-free, etc., based on personal preferences.
If you’d like, tell me your goals (deficiency, sleep, cramps, anxiety, etc.), your current medications, kidney health status, and whether you prefer once-daily or divided dosing. I can help you estimate a starting dose and point out specific product considerations.