In the united states, accidental overdose of is the most common cause of poisoning deaths in children under age six. in the united states, accidental overdose of is the most common cause of poisoning deaths in children under age six. zinc copper iron lead

The answer is Iron.

Iron overdose or poisoning it's when the iron intake is very superior to normal and can become fatal. This term has been associated with young children in the united states due to the large consumptions of iron supplement pills, which look like sweets. Just 3 grams can be fatal for a two year old.

Ithink it is b  employees