Maybe you’ve heard some health claims about magnesium, like that it could help with muscle cramps, stress or sleep. If you shop for a supplement, you’ll probably find a few different types of magnesium you could buy.
Not all types of magnesium work the same way. One form, magnesium glycinate, is popular because it’s gentle on your stomach and easy for your body to absorb. But before you buy a bottle, you should know what makes this supplement different and whether you even need it.
Alexandra Lessem, a family health nurse practitioner with Banner Health, filled us in on magnesium glycinate.
What makes magnesium glycinate unique
Magnesium is an essential mineral. It plays a role in more than 300 processes in the body, from muscle and nerve function to heart rhythm and bone strength.
Most people can get the magnesium they need through food. But certain diets, medications and health conditions can cause lower levels.
Magnesium glycinate is magnesium that’s bound to the amino acid glycine. This pairing helps your body absorb magnesium better. Plus, you’re less likely to have an upset stomach with magnesium glycinate, compared to other types of magnesium.
Here’s how it compares to common forms you’ll see on the shelf:
- Magnesium oxide: Poorly absorbed but useful for constipation; found in medications like Maalox and Mylanta.
- Magnesium citrate: Better absorbed but can cause loose stools; may be used to treat constipation.
- Magnesium threonate: Better at crossing the blood-brain barrier and marketed for brain health, sleep and headaches but evidence is still limited.
- Magnesium glycinate: Well-absorbed and may support sleep and relaxation.
“With magnesium glycinate, more of the glycinate is absorbed from the digestive tract, which means it has benefits for neurologic conditions and is less likely to cause GI issues like diarrhea,” Lessem said.
For a broader overview of magnesium’s role in bone, muscle and nerve health, read our general magnesium guide.
Evidence-based magnesium glycinate benefits
“Magnesium glycinate can be helpful for stress relief, insomnia, muscle cramps, restless leg syndrome, bone health and possibly metabolic health and blood sugar control,” Lessem said.
People often take magnesium glycinate for help with certain conditions.
- Better sleep and relaxation: Magnesium supports healthy nerve and muscle function, which helps calm your nervous system. Magnesium glycinate is bound to glycine, which has its own relaxing effects. So magnesium glycinate may help you sleep better and make it less likely to wake up during the night. Research is still early but some studies show small improvements in sleep among adults with low magnesium levels.
- Muscle and nerve support: Low magnesium can cause cramps, muscle twitches and fatigue. Magnesium glycinate can help restore balance, especially for athletes, older adults or people who don’t get enough magnesium in their diet.
- Heart and bone health: Magnesium glycinate helps your heart beat as it should and works with calcium and vitamin D to help your bones stay strong. Getting enough magnesium may also help keep blood pressure in a healthy range.
- Stress and mood: Magnesium helps manage stress hormones and supports neurotransmitters related to mood. It’s not a treatment for anxiety or depression but maintaining good magnesium levels can help with overall emotional well-being.
However, don’t expect to see major changes in your health if you start taking magnesium glycinate.
“The evidence behind these purported benefits is weak. Supplements are not subject to the same rigorous testing as prescription medications, so evidence is lacking for many of them. This doesn't necessarily mean they don't have benefits, just that it hasn't been strongly proven,” Lessem said.
Magnesium glycinate isn’t a cure-all but it may be useful if you have low magnesium or increased needs because of stress, your age or your activity level.
How to get magnesium and when to supplement
The best way to get magnesium is through food. “Eating a diet rich in a variety of plant foods should provide plenty of magnesium for most people,” Lessem said.
Try adding more of these magnesium-rich foods to your routine:
- Leafy greens: Spinach, kale, Swiss chard
- Nuts and seeds: Almonds, cashews, pumpkin seeds
- Whole grains: Brown rice, oatmeal, quinoa
- Beans: Black beans, lima beans
- Avocados
- Potatoes
- Tofu
- Dark chocolate (in moderation)
When magnesium glycinate supplements may help
You might consider magnesium glycinate supplements if you:
- Don’t have much magnesium in your diet
- Take medications like some diuretics or proton pump inhibitors that lower magnesium levels
- Have muscle cramps often
- Have sleep issues
- Have a medical condition that makes it harder for your body to absorb nutrients
“The number of people who are deficient in magnesium and need a magnesium supplement is very small, so it is not necessary to get tested or start taking one if you are feeling well overall and eating a healthy diet,” Lessem said. “Unless you want to try it for one of these conditions, it is unlikely to do you any good. Save your money and buy some spinach instead!”
That said, there are cases where she recommends it. “While true magnesium deficiency is rare, I typically recommend trying magnesium glycinate to my patients who suffer from insomnia, restless leg syndrome, frequent headaches or muscle cramps. It may or may not work, but it is generally safe to try as long as it is taken at the proper dosage,” Lessem said.
The typical adult magnesium glycinate dosage ranges from 200 to 400 mg daily, taken with meals or before bed. Always follow your provider’s recommendation.
Choosing a quality supplement
If you decide to try a magnesium glycinate supplement, look for:
- Certification by a third party like USP, NSF or ConsumerLab
- A label that reads “magnesium glycinate” or “bisglycinate”
- Products that don’t make extreme claims
- Minimal additives or artificial colors
Safety and who should be cautious
“Magnesium supplements are considered safe when you take them in recommended doses and high magnesium is very rare,” Lessem said. But too much can lead to nausea, diarrhea or drowsiness.
Talk to your doctor before using magnesium supplements if you:
- Have kidney disease or impaired kidney function
- Take antibiotics, diuretics, blood thinners or medications for heartburn or blood pressure
- Have a clotting disorder
- Are pregnant or breastfeeding
Very high doses can cause low blood pressure, irregular heartbeat or confusion, especially in people with kidney problems. Always talk to your provider or pharmacist before starting any new supplement.
The bottom line
Magnesium glycinate is a form of magnesium that may help with better sleep, muscle health and overall wellness. Still, supplements should complement, not replace, a balanced diet rich in whole foods.
If you’re considering magnesium glycinate, start by talking with a Banner Health nutrition professional who can help you choose the right form and dose for your needs.
