Mineral
Iron (chelated)
Iron deficiency mimics anxiety symptoms in kids: irritability, poor focus, fatigue, sleep problems, restless legs. Have it tested before guessing. Chelated iron is gentlest on the stomach.
Typical pediatric dose
Only supplement after a blood test. Typical pediatric dose: 3-6 mg/kg/day under medical supervision.
Safety notes
Iron poisoning is the leading cause of accidental child poisoning. Lock it up. Don't combine with calcium-rich meals.