Magnesium Glycinate

Magnesium is a mineral involved in nerve and muscle function. Low magnesium intake is common, and some small studies suggest supplements may help with sleep or stress-related symptoms, but the evidence is limited and mixed. It is not a treatment for anxiety or insomnia.

Adults who want to discuss magnesium with a clinician, particularly if their diet is low in magnesium. Whether it suits you depends on your health, medicines and test results — ask a clinician.

Studies have used a range of doses, commonly 200–400 mg per day. The NIH upper limit for magnesium from supplements is 350 mg per day for adults. Doses vary by product and person; this is not personal medical advice.

Studies measured effects over weeks.

Diarrhea, nausea and cramping. People with kidney disease should not take magnesium supplements without medical advice.

Reduce or stop if you get loose stools. Ask your doctor if you have kidney disease or take medicines affected by magnesium.

Evidence level (our editorial summary, not a formal grading): Limited.

Pregnancy & breastfeeding: Ask your provider before taking magnesium supplements in pregnancy.

Medication interactions: Can reduce absorption of some antibiotics, bisphosphonates and levothyroxine; can interact with diuretics.

Talk to a healthcare professional before use if you are pregnant, breastfeeding, planning pregnancy, have a medical condition, take any medicine, or are scheduled for surgery. Dietary supplements are not approved by the FDA for safety or effectiveness before they are sold, and quality varies between products.

Reliable sources to check: NIH Office of Dietary Supplements fact sheets · NCCIH Herbs at a Glance · MedlinePlus Herbs & Supplements · FDA — Dietary Supplements