Question: is 5 mg of melatonin safe for a child?
Answer: Most children who benefit from melatonin – even those with diagnoses of ADHD or Autism Spectrum Disorders – don't need more than 3 to 6 mg of melatonin. Some children benefit from as little as 0.5 mg before bedtime. Younger children tend to be given 1 to 3 mg and older children/teens a little more.