What is the recommended dosage for Iron?

Rls: 65 mg elemental iron if ferritin <75; General: 18 mg/day (women)

What are the side effects of Iron?

Potential side effects include: Constipation, Nausea, Stomach pain, Dark stools, Iron overload risk (hemochromatosis).

How does iron deficiency affect sleep?

Iron deficiency is a well-established risk factor for restless leg syndrome (RLS), which significantly disrupts sleep quality. Iron is essential for dopamine synthesis in the brain, and low ferritin levels (below 75 ng/mL) are associated with increased RLS severity. The RLS Foundation recommends ferritin testing for anyone with restless leg symptoms that interfere with sleep. Iron supplementation under medical guidance may improve sleep when deficiency is confirmed.

Can iron supplementation help with restless leg syndrome?

Iron is the most evidence-supported supplement for restless leg syndrome (RLS). Iron is required for dopamine synthesis — the neurotransmitter whose dysfunction is central to RLS. Research across 65 studies with 24,923 total participants — including 5 meta-analyses — supports iron's role in RLS, rated Grade A (Strong). Intravenous iron shows the most consistent results, but oral iron supplementation is also studied for people with low-normal ferritin levels.

What ferritin level causes sleep problems from iron deficiency?

Research on restless leg syndrome and iron suggests that ferritin levels below 75 mcg/L may be associated with RLS symptoms, even when serum iron and hemoglobin are within normal range. Most guidelines recommend aiming for ferritin above 50 to 75 mcg/L in people with RLS. Standard anemia thresholds (ferritin below 12-15 mcg/L) may miss the subgroup who benefit from iron optimization for sleep-disrupting RLS symptoms.

Which form of iron is best absorbed for sleep and RLS support?

Iron bisglycinate (also called iron bis-glycinate chelate) is generally considered the best-absorbed and best-tolerated oral form, with fewer gastrointestinal side effects than ferrous sulfate. Ferrous sulfate is the most commonly studied oral iron form in RLS research, given its long history of clinical use. Taking iron with vitamin C may enhance absorption, while taking it with calcium, tea, or coffee can significantly reduce uptake. Testing iron and ferritin levels before supplementing is strongly recommended.

How long does iron take to improve restless leg syndrome symptoms?

Research suggests iron supplementation may improve RLS symptoms within 4 to 12 weeks for oral iron, depending on the severity of iron deficiency and the form of iron used. Intravenous iron infusion shows faster and more pronounced effects, often within 2 to 4 weeks in RLS trials. The large evidence base — 65 studies with 24,923 participants — includes studies at various timepoints, with longer duration generally associated with greater improvement in RLS symptom scores.

Iron

Q: What are the side effects of Iron?

Potential side effects include: Constipation, Nausea, Stomach pain, Dark stools, Iron overload risk (hemochromatosis).

Q: How does iron deficiency affect sleep?

Iron deficiency is a well-established risk factor for restless leg syndrome (RLS), which significantly disrupts sleep quality. Iron is essential for dopamine synthesis in the brain, and low ferritin levels (below 75 ng/mL) are associated with increased RLS severity. The RLS Foundation recommends ferritin testing for anyone with restless leg symptoms that interfere with sleep. Iron supplementation under medical guidance may improve sleep when deficiency is confirmed.

Q: Can iron supplementation help with restless leg syndrome?

Iron is the most evidence-supported supplement for restless leg syndrome (RLS). Iron is required for dopamine synthesis — the neurotransmitter whose dysfunction is central to RLS. Research across 65 studies with 24,923 total participants — including 5 meta-analyses — supports iron's role in RLS, rated Grade A (Strong). Intravenous iron shows the most consistent results, but oral iron supplementation is also studied for people with low-normal ferritin levels.

Q: What ferritin level causes sleep problems from iron deficiency?

Research on restless leg syndrome and iron suggests that ferritin levels below 75 mcg/L may be associated with RLS symptoms, even when serum iron and hemoglobin are within normal range. Most guidelines recommend aiming for ferritin above 50 to 75 mcg/L in people with RLS. Standard anemia thresholds (ferritin below 12-15 mcg/L) may miss the subgroup who benefit from iron optimization for sleep-disrupting RLS symptoms.

Q: Which form of iron is best absorbed for sleep and RLS support?

Iron bisglycinate (also called iron bis-glycinate chelate) is generally considered the best-absorbed and best-tolerated oral form, with fewer gastrointestinal side effects than ferrous sulfate. Ferrous sulfate is the most commonly studied oral iron form in RLS research, given its long history of clinical use. Taking iron with vitamin C may enhance absorption, while taking it with calcium, tea, or coffee can significantly reduce uptake. Testing iron and ferritin levels before supplementing is strongly recommended.

Q: How long does iron take to improve restless leg syndrome symptoms?

Research suggests iron supplementation may improve RLS symptoms within 4 to 12 weeks for oral iron, depending on the severity of iron deficiency and the form of iron used. Intravenous iron infusion shows faster and more pronounced effects, often within 2 to 4 weeks in RLS trials. The large evidence base — 65 studies with 24,923 participants — includes studies at various timepoints, with longer duration generally associated with greater improvement in RLS symptom scores.

mineral

Also known as: Ferrous sulfate, Iron bisglycinate

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About

Iron is essential for dopamine synthesis and oxygen transport throughout the body. Iron deficiency is the primary cause of restless leg syndrome (RLS), a condition that significantly disrupts sleep. Research suggests that supplementing iron when ferritin is low may help reduce RLS symptoms.

How It Works

Required for dopamine synthesis (tyrosine hydroxylase cofactor); iron deficiency is the primary cause of RLS.

Evidence For Conditions

Condition	Grade	Studies	Participants
Restless Leg Syndrome	A	173	36638	View →

Side Effects

Constipation
Nausea
Stomach pain
Dark stools
Iron overload risk (hemochromatosis)

Drug & Supplement Interactions

Antacids and PPIs — reduce iron absorption
Levothyroxine — iron reduces thyroid medication absorption
Antibiotics (tetracyclines, fluoroquinolones) — mutual absorption reduction
Calcium supplements — take separately by 2 hours

Always inform your healthcare provider about all supplements you take.

Magnesium Glycinate Magnesium L-Threonate Zinc

Quick Facts

Dosage: Rls: 65 mg elemental iron if ferritin <75; General: 18 mg/day (women)
Forms: capsule tablet liquid
Natural Sources: Red meat, Spinach, Lentils, Fortified cereals
Upper Limit: 45 mg/day
Best Time: On an empty stomach with vitamin C; take in the morning, not before bed

Evidence Summary

Restless Leg Syndrome A

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.