Zinc. Sufficient intake daily. Don't helicopter kids. Let them free to do things that aren't too clean like exploring creeks or rummaging in the dirt, or forge

Zinc. Sufficient intake daily. Don't helicopter kids. Let them free to do things that aren't too clean like exploring creeks or rummaging in the dirt, or forgetting to wash food, or even eating food off the floor, or not washing their hands after touching animals. They also need to eat things like nuts, or other strange or unusual things from an early age.