Treats insomnia
Iron is a mineral needed by the body to produce hemoglobin. A deficiency of hemoglobin can lead to anemia, which can cause fatigue and insomnia. Iron supplements can help treat iron deficiency anemia and improve sleep. However, too much iron can be harmful and cause side effects like stomach upset and constipation. Talk to your doctor before taking an over the counter iron supplement to treat insomnia.
References
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2805706/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4751426/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3685880/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3900049/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5892776/