Last updated: October 2026
Magnesium is a popular remedy for restless legs, but there’s no good evidence it works: a 2019 systematic review found only one small controlled trial, which showed no benefit. Iron has better evidence, as low iron is a known cause. Ask your GP to check your ferritin.
Below: what the research shows, iron and RLS, magnesium creams, which magnesium if you want to try it, what the NHS recommends, and when to see a GP.
Does magnesium help restless legs?
A 2019 systematic review found just eight studies of magnesium for restless legs syndrome (RLS) or periodic limb movements. Only one was a randomised controlled trial, and it found no benefit over placebo; the rest were small case series or single case reports. The reviewers couldn’t conclude that magnesium works.
If it’s a single jolt as you drift off rather than an urge to move, it’s more likely a hypnic jerk; see hypnic jerks.
Many people still report that magnesium in the evening helps them, and magnesium contributes to normal muscle function and normal functioning of the nervous system. But if your intake is already adequate, extra magnesium is unlikely to fix RLS. Night-time leg cramps are different from RLS; see magnesium for cramps.
Iron: the supplement with better evidence
Low iron is one of the main known causes of restless legs, including in pregnancy. A 2019 Cochrane review found iron treatment probably improves RLS symptoms compared with placebo. Specialists often aim for a ferritin (iron store) level well above the normal cut-off in people with RLS.
Don’t take iron supplements without a blood test first, as too much iron is harmful. Ask your GP to check your ferritin; they’ll advise on whether and how to take iron.
Magnesium cream, lotion and spray for restless legs
Magnesium creams, lotions, oils and Epsom salt baths are widely sold for restless legs. A 2017 review of transdermal magnesium found no good evidence that meaningful amounts are absorbed through the skin. See does magnesium spray work? The ritual itself may help, though: massaging your legs and a warm bath before bed are both things people with RLS find soothing, and the NHS suggests a warm bath and stretching.
| Option | Absorbs magnesium? | May still help because… |
|---|---|---|
| Magnesium cream or lotion | Little evidence | Leg massage |
| Magnesium oil spray | Little evidence; can sting | Part of a bedtime routine |
| Epsom salt bath | Little evidence | Warmth relaxes muscles |
| Oral magnesium | Yes | Corrects a low intake |
If you want to try magnesium
- Form: glycinate is gentle on the stomach and suits an evening routine; citrate is well absorbed but can loosen stools. See types of magnesium.
- Amount: 100 to 300mg a day is typical. The NHS says 400mg or less a day from supplements is unlikely to cause harm.
- Timing: in the evening, an hour or two before bed.
- How long: give it four weeks, and keep a symptom diary.
- Kidney problems: speak to your GP first.
Our Magnesium Glycinate Sleep Complex combines bisglycinate and citrate with glycine, L-theanine and botanicals, giving 148mg of magnesium per serving as a warm evening drink. See also magnesium for sleep.
What helps restless legs (NHS)
| Do | Don’t |
|---|---|
| Have a regular sleep routine | Have caffeine after midday |
| Exercise during the day | Drink alcohol within 2 hours of bed |
| Take a warm bath or stretch before bed | Eat a big meal or do strenuous exercise close to bedtime |
| Do something distracting, like a puzzle, when symptoms start | Smoke |
If symptoms are frequent or severe, a GP can check for causes and may suggest medicines.
When to see a GP
See a GP if restless legs affect your sleep or daily life, started in pregnancy, or began after a new medicine (some antidepressants, antihistamines and anti-sickness medicines can trigger RLS). A simple blood test can check iron, kidney function and other causes.
Sudden painful tightening is more likely a cramp. See leg cramps at night.
FAQs
Does magnesium help restless legs?
There’s no good evidence it does. The only controlled trial found no benefit. Iron has better evidence, so ask your GP to check your ferritin.
Does magnesium cream work for restless legs?
There’s little evidence magnesium is absorbed through the skin. Massaging your legs and a warm bath may still feel soothing.
What is the best magnesium for restless legs?
No form is proven for RLS. If you want to try it, glycinate in the evening is gentle and easy to take.
How long does magnesium take to work for restless legs?
Give it about four weeks. If nothing has changed, magnesium probably isn’t the answer, and it’s worth checking your iron.
What deficiency causes restless legs?
Low iron is the best-known cause. A GP can check your ferritin with a blood test.
What stops restless legs fast?
Moving, stretching or massaging your legs, a warm bath, or a distracting activity can ease symptoms. Avoid caffeine and alcohol in the evening.
Sources
- Marshall NS et al. Magnesium supplementation for the treatment of restless legs syndrome and periodic limb movement disorder: a systematic review. Sleep Med Rev, 2019.
- Trotti LM, Becker LA. Iron for the treatment of restless legs syndrome. Cochrane Database Syst Rev, 2019.
- Gröber U et al. Myth or reality: transdermal magnesium? Nutrients, 2017.
- NHS. Restless legs syndrome.
- NHS. Vitamins and minerals: magnesium.
