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Restless legs
Restless legs syndrome is one of the few entries on this page where a nutrient measurement is genuinely part of standard clinical assessment — and the nutrient is iron.
General information only, not a diagnosis. A symptom is not proof of a deficiency — most symptoms here have many possible causes, and the common ones are rarely nutritional. Do not start a supplement to treat a symptom; the safe route is a blood test if one is warranted, and a doctor to interpret it. Use the red-flag list on each page, and see a clinician for anything that persists or worries you.
The condition itself is specific rather than vague: an urge to move the legs, usually with an uncomfortable sensation, worse in the evening and at rest, and relieved by movement. That combination is what distinguishes it from cramps, from neuropathy and from ordinary fidgeting, and it is why a clinician asks about the timing before anything else.
Iron is the standout. Low iron stores are associated with restless legs, the association is thought to involve iron availability in the brain rather than in the blood, and measuring ferritin is a routine part of assessment. This is unusual on this page: for most symptoms here the honest answer is "nutrient deficiency is unlikely to be your explanation", and for restless legs it is genuinely part of the workup. It is still a blood test rather than a reason to start iron on your own — the level that matters here is interpreted differently from ordinary anaemia thresholds, and that interpretation is a clinician's job.
The other nutritional entries are weaker. Folate and magnesium both appear in the discussion; magnesium in particular is widely recommended and thinly supported, in line with its record for muscle cramps. Pregnancy is a common context, and restless legs in pregnancy frequently resolves after delivery.
What matters at least as much is the list of things that make it worse. Several medicine classes are recognised aggravators, including some antidepressants, antihistamines and anti-nausea drugs. Caffeine, alcohol and nicotine late in the day are common contributors. Kidney disease and neuropathy sit behind some cases. Sleep deprivation makes the symptoms worse, which then makes sleep worse, which is the loop most people are stuck in by the time they look it up.
Because the condition disrupts sleep so effectively, and because effective treatment exists, this is one to take to a doctor rather than to manage indefinitely with a magnesium tablet.
Nutrients commonly discussed for restless legs
Each nutrient below is rated for how strong the evidence is that it relates to this symptom. "Relevant only if you are deficient" means it can matter when your level is genuinely low, but topping it up when it is not low does nothing.
Iron Relevant only if you are deficient
The one nutrient genuinely embedded in clinical assessment of restless legs. Ferritin is routinely measured, and the threshold used is not the same as for ordinary anaemia — which is exactly why interpretation belongs with a clinician.
| Everyday food | Iron per 100 g |
|---|---|
| Canadian cultivated emi-tsunomata seaweed, dry | 66.4 mg |
| Beef spleen, raw | 44.5 mg |
| Lamb spleen, raw | 41.9 mg |
| Beef spleen, cooked | 39.4 mg |
| Lamb spleen, braised | 38.7 mg |
| Hershey's European Style Cocoa | 36 mg |
Full ranking: foods highest in iron.
Folate Weak evidence
Appears in the discussion, particularly in pregnancy, with much weaker support than iron.
| Everyday food | Folate per 100 g |
|---|---|
| Yeast extract spread | 3786 µg |
| Active dry yeast | 2340 µg |
| Quaker Cap'n Crunch With Crunchberries | 1630 µg |
| Quaker Halloween Crunch | 1615 µg |
| Quaker Cap'n Crunch | 1555 µg |
| Quaker Peanut Butter Crunch | 1554 µg |
Magnesium Weak evidence
Widely recommended and thinly supported, mirroring its record for muscle cramps. Frank deficiency is uncommon on a mixed diet.
| Everyday food | Magnesium per 100 g |
|---|---|
| Rice bran | 781 mg |
| Hulled hemp seed | 700 mg |
| Canadian cultivated emi-tsunomata seaweed, dry | 692 mg |
| Wheat bran | 611 mg |
| Kretschmer toasted wheat bran | 606 mg |
| Pumpkin seeds | 592 mg |
Full ranking: foods highest in magnesium.
Vitamin D Weak evidence
Studied and inconclusive. Not part of standard management.
| Everyday food | Vitamin D per 100 g |
|---|---|
| Cod liver fish oil | 250 µg |
| Maitake mushrooms, raw | 28.1 µg |
| Greenland halibut, raw | 27.4 µg |
| Mackerel, salted | 25.2 µg |
| Carp, raw | 24.7 µg |
| Eel, raw | 23.3 µg |
Full ranking: foods highest in vitamin d.
Vitamin B12 Relevant only if you are deficient
Relevant mainly because B12 deficiency causes neuropathy, which can produce leg symptoms that get labelled restless legs.
| Everyday food | Vitamin B12 per 100 g |
|---|---|
| Clam, cooked | 98.9 µg |
| Beef liver, cooked | 96 µg |
| Lamb liver, fried | 85.7 µg |
| Veal liver, braised | 84.6 µg |
| Beef liver, pan-fried | 83.1 µg |
| Lamb kidneys, braised | 78.9 µg |
Full ranking: foods highest in vitamin b12.
Source: Foods richest in each nutrient: USDA FoodData Central SR Legacy (public domain), per 100 g · checked 2026-09-02
Causes that are usually more likely
Before a nutrient, these are the explanations a clinician would normally consider first for restless legs:
- Pregnancy — common, and often resolves after delivery
- Kidney disease
- Peripheral neuropathy, including diabetic neuropathy
- Some antidepressants, antihistamines and anti-nausea medicines
- Caffeine, alcohol and nicotine, especially in the evening
- Sleep deprivation, which worsens the symptoms it causes
- A family history — the condition runs in families
- Spinal conditions affecting the nerve roots
When to see a doctor
Treat these as reasons to seek a professional opinion rather than to self-treat:
- Symptoms severe enough to prevent sleep most nights
- Numbness, weakness or loss of sensation in the legs
- Symptoms starting or worsening sharply after a new medicine
- Leg swelling, colour change or ulcers
- Known kidney disease with new leg symptoms
- Symptoms in a child
This list is not exhaustive, and a symptom that is severe, persistent or getting worse always deserves a professional opinion. If you feel very unwell, seek urgent care rather than reading further.
Frequently asked questions
Should I get my ferritin checked for restless legs?
Measuring iron stores is a routine part of clinical assessment for restless legs, so asking about it is reasonable. Interpreting the number, and deciding what to do about it, is a clinician's job.
Does magnesium help restless legs?
It is widely recommended and the supporting evidence is thin, much as it is for muscle cramps. Effective treatments exist, which is a good reason to see a doctor rather than to keep experimenting.
Does this symptom mean I have a deficiency?
No. Restless legs has many possible causes and most are not nutritional. A nutrient link is worth checking with a blood test only when other clues point that way — it is never established by the symptom alone.
Other symptoms
Tiredness and low energy
Tiredness is the most searched symptom on this list and the least specific. It is a normal response to poor sleep, stress and overwork, a feature of dozens of medical conditions, and occasionally the presenting sign of a nutrient deficiency that a blood test would find in minutes.
Hair loss and thinning
Hair shedding has a long list of causes, most of which are not nutritional. The commonest by a wide margin is genetic pattern hair loss, followed by telogen effluvium — a delayed shedding response to a stressor two or three months earlier.
Brittle, splitting or ridged nails
Nails split, peel and ridge for reasons that are mostly mechanical and environmental. Nutrition is in the conversation, but it is well down the list behind water, detergent, solvents and age.
Muscle cramps
Night cramps and exercise cramps are extremely common, and the nutritional explanations attached to them are among the least well supported on this whole page.
Low mood
Low mood is a symptom, not a diagnosis, and the distance between a low week and a depressive illness is a clinical judgement rather than something a checklist can make. This page covers only the nutritional part of a much larger conversation.
Poor concentration and brain fog
"Brain fog" is a description rather than a diagnosis, and it covers everything from a bad night's sleep to the aftermath of an infection to an untreated attention disorder.
All symptoms · Nutrient toplists · Blood test reference ranges
Give a persistent symptom real context
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