Iron — the primary RLS treatment
Iron deficiency in the brain (separate from anemia) drives most RLS. Target ferritin >75 ng/mL for symptom relief — many neurologists target >100. Ferrous bisglycinate is gentler on the GI tract; take with vitamin C for absorption.
Magnesium — for muscle and nervous system calming
Magnesium reduces muscle excitability and supports the nervous system. Magnesium glycinate is preferred for RLS — calming effects without bowel disruption that worsens nighttime symptoms.
Folate & B Vitamins — supporting iron and nerve function
Folate and B12 support both iron utilization and nervous system function. Folate deficiency can independently cause RLS-like symptoms. Methylated folate is preferred when MTHFR variants exist.
Vitamin D — emerging evidence
Vitamin D deficiency is associated with RLS severity. Correcting deficiency may improve symptoms in some patients, particularly those with concurrent fatigue or muscle issues.
Calming Adjuncts — for sleep with RLS
When RLS disrupts sleep onset, these may help with the secondary sleep problem. They don't treat RLS itself but reduce associated insomnia.
Frequently Asked Questions
What is the best supplement for restless legs?
Iron, in 90% of cases — but only after testing. RLS is often caused by brain iron deficiency even when blood iron looks normal. The target ferritin level for RLS relief is over 75 ng/mL (many specialists target over 100 ng/mL). Ferrous bisglycinate 50-100 mg of elemental iron daily, taken with vitamin C, is well-tolerated. Effects appear over 8-12 weeks. Test ferritin before, during, and after supplementation.
Why is iron so central to RLS?
RLS is fundamentally a brain dopamine issue, and iron is essential for dopamine synthesis. Brain iron levels can be low even when blood iron and hemoglobin look normal, which is why standard "anemia" testing misses RLS-relevant iron deficiency. Ferritin (iron storage protein) is the more sensitive marker. Many RLS sufferers see dramatic improvement once ferritin is brought above 75-100 ng/mL.
Should I just take iron supplements without testing?
No. Iron supplementation without testing is risky — about 1 in 200 people has hemochromatosis (iron overload), and excess iron causes liver damage and other problems. Test ferritin and total iron saturation first. If ferritin is below 75 ng/mL with RLS symptoms, supplementation is justified. Retest at 3-6 months to confirm levels are rising and not climbing too high.
Does magnesium really help RLS?
Modestly. Magnesium reduces overall muscle excitability and may help RLS symptoms, particularly when muscle cramping is part of the picture. Effect is smaller than iron correction. Magnesium glycinate 200-400 mg before bed is reasonable adjunct, especially if you have concurrent muscle tension or sleep issues. Don't expect magnesium alone to resolve significant RLS.
What if my ferritin is normal but I have RLS?
Several possibilities. The "normal" range for ferritin (10-200 ng/mL) is too broad for RLS — you need >75 ng/mL specifically. If yours is 30-50, that's "normal" by lab standards but inadequate for RLS. Other RLS contributors: pregnancy (transient), kidney disease, certain medications (antidepressants, antihistamines), neurological conditions. See a sleep specialist or neurologist if iron correction doesn't resolve symptoms.
When should I see a doctor about RLS?
See a doctor if RLS significantly disrupts sleep, if symptoms are severe or worsening, if you experience them during daytime, if leg movements occur during sleep (possible PLMD), or if RLS started during pregnancy. Modern RLS treatment includes iron infusions for severe iron-deficient cases (faster than oral supplements), dopamine agonists for refractory RLS, and alpha-2-delta ligands (gabapentin, pregabalin). Severe RLS is highly treatable but often underdiagnosed.