You keep hearing that magnesium helps with everything from sleep to cramps to stress, and every list online says something bigger. So what are the real benefits of magnesium?
The short answer: Magnesium is an essential mineral. Your body uses it in more than 300 reactions. Those include normal nerve and muscle work, heart rhythm, bone strength, blood sugar and making energy. The biggest benefit most people can get is simply eating enough of it. Surveys found nearly half of Americans fall short from food alone.
By Dr. Doug Strobel, MD, a board-certified neurologist who formulated Dr. Doug's balms. Last reviewed October 6, 2026.
Key takeaways
- Your body needs magnesium for more than 300 reactions, including normal nerve and muscle work, heart rhythm and bone strength.
- U.S. survey data showed 48% of Americans got less magnesium than they needed from food in 2005 to 2006.
- A Cochrane review of 11 trials found that magnesium pills are unlikely to do much to prevent muscle cramps in older adults.
Why I grade the evidence instead of making a list
You deserve better than another "amazing benefits" list that promises the moon. I'm Dr. Doug Strobel, MD, a board-certified neurologist. Here is what magnesium does and how strong the proof is for each claim.
What does magnesium do for the body?
Magnesium helps run more than 300 chemical reactions in your body. You need it for normal nerves, muscles and heart rhythm. It also helps with blood vessels, the immune system, bones and blood sugar control (Volpe, Current Sports Medicine Reports, 2015).
In your nervous system, magnesium helps keep nerve signals in balance. In your muscles, it works with calcium. Calcium helps a muscle tighten. Magnesium is part of how it relaxes again.
How many people don't get enough magnesium?
A lot. National survey data showed 48% of Americans ate less magnesium than they needed in 2005 to 2006 (Rosanoff, Nutrition Reviews, 2012).
Magnesium is an essential mineral, and more than half of people don't hit their target some years. Low intake is common because the best sources, like leafy greens, beans, nuts, seeds and whole grains, are what a busy diet skips. For the warning signs, see 10 signs you might be low in magnesium.
What are the benefits of magnesium for women?
Magnesium does the same basic jobs for women as for anyone: normal nerves, muscles, bones and heart. The main difference is the amount. Most adult women need 310 to 320 mg a day. Most men need 400 to 420 mg (the U.S. Recommended Dietary Allowances, as reported by Moore-Schiltz, British Journal of Nutrition, 2015). Online claims about magnesium for menopause, weight loss or hair rest on small studies or none at all. Ask your doctor before you take a supplement, especially if you are pregnant.
Benefits of magnesium, graded by evidence
The strongest proof is for getting enough magnesium overall. Claims about specific health problems are weaker. Most of that research is on food or pills, not skin products.
| Area | What magnesium does | Strength of evidence | Where it comes from |
|---|---|---|---|
| Nerve and muscle function | Needed for normal signaling and for muscles to relax | Strong (basic physiology) | Textbook biology; reviews like Volpe 2015 |
| Bone | Part of bone structure and helps calcium absorption | Strong for its role; supplements for bone health need a doctor's guidance | Volpe 2015 |
| Exercise | Low intake can hurt performance; extra magnesium doesn't help if you already get enough | Moderate | Nielsen and Lukaski, Magnesium Research, 2006 |
| Leg cramps | Oral magnesium did not meaningfully reduce cramps in older adults | Moderate, and mostly negative | Cochrane review, Garrison 2020 |
| Restless legs | Small studies mixed; a systematic review couldn't conclude | Weak | Marshall, Sleep Medicine Reviews, 2019 |
| Heart, blood sugar, blood pressure | Low intake is associated with these conditions in population studies | Association only, not proof that a supplement fixes them | Rosanoff 2012 |
First, "linked to" is not the same as "fixes." Studies of large groups of people link low magnesium to several long-term health problems. That does not mean magnesium treats them. Second, if you have a heart, blood pressure, diabetes or kidney problem, magnesium is a talk for your doctor, not a blog post. Kidney disease in particular can make extra magnesium unsafe.
Benefits of magnesium for muscles and exercise
If you're low on magnesium, getting enough can support normal exercise. If you already get enough, more won't make you faster.
That is what a review on magnesium and exercise found. It also notes that hard exercise makes you lose more magnesium in urine and sweat. That may raise your needs by 10% to 20% (Nielsen and Lukaski, Magnesium Research, 2006). Athletes in weight-class sports are most likely to fall short.
For cramps, the evidence is humbling. A Cochrane review looked at 11 trials. It found magnesium pills are unlikely to do much to prevent cramps in older adults who get them (Garrison, Cochrane Database of Systematic Reviews, 2020). I'd rather tell you that than sell you a promise.
Does magnesium help with sleep?
Magnesium is part of how your nervous system relaxes, and many people make it part of a calm bedtime routine.
What helps sleep most is the same bedtime, the same wind-down steps, a cool dark room and screens off. Some people add a magnesium leg or shoulder massage to that routine because the ritual itself is relaxing.
How do you get more magnesium?
Food first. Leafy greens, pumpkin seeds, almonds, cashews, black beans, edamame, whole grains and dark chocolate are all good sources.
If your doctor suggests a supplement, the form matters. Glycinate and citrate are usually easy on the stomach. Oxide is cheap but harder on the stomach for many people. I break that down in magnesium glycinate vs citrate vs chloride.
What a magnesium balm can and can't do
A magnesium balm is for the spot you're massaging. It is not a way to fix a shortage or manage any of the health problems in the table above.
Lab research shows magnesium can cross the skin's outer layer, mostly through hair follicles, the tiny openings hairs grow from. But human studies are small. So I keep the claim simple: it works right where you put it. People use our Magnesium Balm on tired calves and feet, tight shoulders, and as part of winding down at night.
Full disclosure: I make a magnesium balm. Let me tell you why I felt I needed to make one. I wanted it for myself and for my patients, and so many magnesium sprays and creams sting or feel gritty. I wanted as much magnesium as I could fit, in a balm that massages all the way in. I also wanted it to absorb in completely, with none of the grit, sting or pins-and-needles tingle some magnesium products leave. Mine is the only magnesium balm formulated by a board-certified neurologist. It's hand-crafted, with eight clean ingredients and nothing synthetic. The magic happens when you massage it in completely.
How to use magnesium balm: pick, rub, repeat
- Pick your spot. Tired calves, sore feet, tight shoulders. Start with a thin layer.
- Rub it in. Cover the spot plus about 5 inches above, below and all the way around it. Massage until it disappears.
- Repeat. Any time works: after a workout, at your desk or at bedtime. Skip broken or irritated skin.
Picture a plate with greens and beans at dinner, then two quiet minutes on your calves before bed.
Related reading
- Magnesium Cream vs Pills: Which Should You Use (and Can You Use Both)?
- Does Topical Magnesium Absorb Through the Skin? A Neurologist Reads the Research
- Why Do Athletes Take Magnesium? 6 Reasons, and What the Science Supports
Frequently asked questions
What are the benefits of magnesium?
The benefits of magnesium come from its role in more than 300 reactions in the body. These include normal nerve and muscle work, heart rhythm, bone strength, blood sugar control and energy. The biggest benefit for most people is getting enough of it from food.
What does magnesium do for the body?
Magnesium helps nerves send normal signals and helps muscles relax after they tighten. It is also part of bone, heart rhythm and blood sugar control. It works with calcium, which helps muscles tighten.
What are the benefits of magnesium for women?
Magnesium does the same jobs in women as in men, and most adult women need 310 to 320 mg a day. Claims about magnesium for menopause or weight loss rest on weak evidence, so ask your doctor before taking a supplement.
Does magnesium help with sleep?
Magnesium is part of how the nervous system relaxes. Sleep trials of magnesium by mouth are still small, and many people make it part of a steady bedtime routine.
Does magnesium help with leg cramps?
Magnesium is unlikely to do much to prevent leg cramps in older adults, a Cochrane review of 11 trials found. The evidence for cramps in pregnancy is mixed.
Can you get magnesium through your skin?
In lab studies, magnesium can cross the skin's outer layer, mostly through hair follicles. Human studies are small, so a magnesium balm is best thought of as working where you put it, not as a replacement for food or supplements.
What are the side effects of magnesium?
Magnesium from food has no known side effects in healthy people. Supplements can cause loose stools, and people with kidney disease should not take magnesium without their doctor's guidance.
Sources
- Volpe SL. Current Sports Medicine Reports, 2015. PMID 26166051
- Rosanoff A, et al. Nutrition Reviews, 2012. PMID 22364157
- Nielsen FH, Lukaski HC. Magnesium Research, 2006. PMID 17172008
- Garrison SR, et al. Cochrane Database of Systematic Reviews, 2020. PMID 32956536
- Marshall NS, et al. Sleep Medicine Reviews, 2019. PMID 31678660
- Chandrasekaran NC, et al. Magnesium Research, 2016. PMID 27624531
- Moore-Schiltz L, et al. British Journal of Nutrition, 2015 (states the RDA as 310 to 320 mg/day for women and 400 to 420 mg/day for men). PMID 26259506
This article is educational and is not medical advice. Dr. Doug's products are cosmetic and are not intended to diagnose, treat, cure or prevent any disease.